/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/bench/exp2x4.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-770125f [2021-05-22 02:14:24,819 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-22 02:14:24,821 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-22 02:14:24,860 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-22 02:14:24,911 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-22 02:14:24,911 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-22 02:14:24,912 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-22 02:14:24,916 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 02:14:24,950 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-22 02:14:24,950 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-22 02:14:24,951 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-05-22 02:14:24,951 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-05-22 02:14:24,953 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-22 02:14:24,953 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-22 02:14:24,953 INFO L138 SettingsManager]: * Use SBE=true [2021-05-22 02:14:24,954 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-22 02:14:24,954 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-22 02:14:24,954 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-22 02:14:24,955 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-22 02:14:24,955 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-22 02:14:24,955 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-22 02:14:24,955 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-22 02:14:24,955 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-22 02:14:24,955 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-22 02:14:24,956 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-22 02:14:24,956 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-22 02:14:24,956 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-22 02:14:24,956 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-22 02:14:24,956 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-22 02:14:24,956 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-22 02:14:24,957 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-22 02:14:24,957 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-22 02:14:24,957 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-22 02:14:24,957 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-22 02:14:24,957 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-22 02:14:24,957 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-22 02:14:24,957 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-22 02:14:24,958 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-05-22 02:14:24,958 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-22 02:14:24,958 INFO L138 SettingsManager]: * Check the insufficient thread errors last=true [2021-05-22 02:14:24,958 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-22 02:14:25,305 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-22 02:14:25,324 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-22 02:14:25,326 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-22 02:14:25,327 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-05-22 02:14:25,328 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-05-22 02:14:25,329 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/bench/exp2x4.wvr.bpl [2021-05-22 02:14:25,329 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/bench/exp2x4.wvr.bpl' [2021-05-22 02:14:25,367 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-22 02:14:25,368 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-22 02:14:25,370 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-05-22 02:14:25,370 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-05-22 02:14:25,370 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-05-22 02:14:25,382 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:14:25" (1/1) ... [2021-05-22 02:14:25,392 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:14:25" (1/1) ... [2021-05-22 02:14:25,399 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-05-22 02:14:25,401 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-22 02:14:25,402 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-22 02:14:25,402 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-22 02:14:25,409 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:14:25" (1/1) ... [2021-05-22 02:14:25,409 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:14:25" (1/1) ... [2021-05-22 02:14:25,410 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:14:25" (1/1) ... [2021-05-22 02:14:25,410 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:14:25" (1/1) ... [2021-05-22 02:14:25,414 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:14:25" (1/1) ... [2021-05-22 02:14:25,419 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:14:25" (1/1) ... [2021-05-22 02:14:25,420 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:14:25" (1/1) ... [2021-05-22 02:14:25,421 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-22 02:14:25,423 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-22 02:14:25,423 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-22 02:14:25,424 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-22 02:14:25,425 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:14:25" (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 02:14:25,487 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-05-22 02:14:25,488 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-05-22 02:14:25,488 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-05-22 02:14:25,488 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-05-22 02:14:25,488 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-05-22 02:14:25,489 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-05-22 02:14:25,489 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-05-22 02:14:25,489 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-22 02:14:25,489 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-22 02:14:25,489 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread3 given in one single declaration [2021-05-22 02:14:25,491 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2021-05-22 02:14:25,491 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2021-05-22 02:14:25,491 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread4 given in one single declaration [2021-05-22 02:14:25,491 INFO L130 BoogieDeclarations]: Found specification of procedure thread4 [2021-05-22 02:14:25,491 INFO L138 BoogieDeclarations]: Found implementation of procedure thread4 [2021-05-22 02:14:25,492 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 02:14:25,689 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-22 02:14:25,689 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-05-22 02:14:25,690 INFO L202 PluginConnector]: Adding new model exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:14:25 BoogieIcfgContainer [2021-05-22 02:14:25,691 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-22 02:14:25,692 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-22 02:14:25,692 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-22 02:14:25,694 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-22 02:14:25,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:14:25" (1/2) ... [2021-05-22 02:14:25,695 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13564a57 and model type exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.05 02:14:25, skipping insertion in model container [2021-05-22 02:14:25,696 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "exp2x4.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:14:25" (2/2) ... [2021-05-22 02:14:25,697 INFO L111 eAbstractionObserver]: Analyzing ICFG exp2x4.wvr.bpl [2021-05-22 02:14:25,702 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-05-22 02:14:25,702 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-22 02:14:25,702 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-05-22 02:14:25,703 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-05-22 02:14:25,747 INFO L149 ThreadInstanceAdder]: Constructed 4 joinOtherThreadTransitions. [2021-05-22 02:14:25,766 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-22 02:14:25,826 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 02:14:25,826 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 02:14:25,826 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 02:14:25,826 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 02:14:25,826 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 02:14:25,826 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 02:14:25,826 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 02:14:25,827 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-22 02:14:25,834 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 46 places, 37 transitions, 106 flow [2021-05-22 02:14:25,928 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 942 states, 940 states have (on average 3.9117021276595745) internal successors, (3677), 941 states have internal predecessors, (3677), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:25,933 INFO L276 IsEmpty]: Start isEmpty. Operand has 942 states, 940 states have (on average 3.9117021276595745) internal successors, (3677), 941 states have internal predecessors, (3677), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:25,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-22 02:14:25,951 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:25,951 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:25,952 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:25,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:25,956 INFO L82 PathProgramCache]: Analyzing trace with hash 500910984, now seen corresponding path program 1 times [2021-05-22 02:14:25,963 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:25,964 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946541276] [2021-05-22 02:14:25,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:26,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:26,102 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 02:14:26,103 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:26,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946541276] [2021-05-22 02:14:26,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946541276] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:14:26,104 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:14:26,104 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-05-22 02:14:26,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493465378] [2021-05-22 02:14:26,108 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-22 02:14:26,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:26,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-22 02:14:26,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-22 02:14:26,123 INFO L87 Difference]: Start difference. First operand has 942 states, 940 states have (on average 3.9117021276595745) internal successors, (3677), 941 states have internal predecessors, (3677), 0 states have call successors, (0), 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 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 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 02:14:26,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:26,215 INFO L93 Difference]: Finished difference Result 1365 states and 5324 transitions. [2021-05-22 02:14:26,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-22 02:14:26,216 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 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 02:14:26,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:26,240 INFO L225 Difference]: With dead ends: 1365 [2021-05-22 02:14:26,240 INFO L226 Difference]: Without dead ends: 1334 [2021-05-22 02:14:26,241 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-22 02:14:26,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1334 states. [2021-05-22 02:14:26,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1334 to 1069. [2021-05-22 02:14:26,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1069 states, 1068 states have (on average 3.903558052434457) internal successors, (4169), 1068 states have internal predecessors, (4169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:26,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1069 states to 1069 states and 4169 transitions. [2021-05-22 02:14:26,368 INFO L78 Accepts]: Start accepts. Automaton has 1069 states and 4169 transitions. Word has length 19 [2021-05-22 02:14:26,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:26,371 INFO L482 AbstractCegarLoop]: Abstraction has 1069 states and 4169 transitions. [2021-05-22 02:14:26,371 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 2 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 02:14:26,372 INFO L276 IsEmpty]: Start isEmpty. Operand 1069 states and 4169 transitions. [2021-05-22 02:14:26,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:14:26,377 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:26,378 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, 1, 1] [2021-05-22 02:14:26,378 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-22 02:14:26,378 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:26,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:26,382 INFO L82 PathProgramCache]: Analyzing trace with hash -1942329299, now seen corresponding path program 1 times [2021-05-22 02:14:26,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:26,383 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652187216] [2021-05-22 02:14:26,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:26,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:26,444 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:26,444 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:26,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652187216] [2021-05-22 02:14:26,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652187216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:26,445 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906610813] [2021-05-22 02:14:26,445 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 02:14:26,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:26,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-22 02:14:26,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:26,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:26,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906610813] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:26,637 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:26,637 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-05-22 02:14:26,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564008876] [2021-05-22 02:14:26,639 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:14:26,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:26,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:14:26,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:14:26,645 INFO L87 Difference]: Start difference. First operand 1069 states and 4169 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:26,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:26,760 INFO L93 Difference]: Finished difference Result 2313 states and 8847 transitions. [2021-05-22 02:14:26,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:14:26,761 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:26,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:26,779 INFO L225 Difference]: With dead ends: 2313 [2021-05-22 02:14:26,779 INFO L226 Difference]: Without dead ends: 2313 [2021-05-22 02:14:26,784 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 1 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 02:14:26,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2313 states. [2021-05-22 02:14:26,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2313 to 1246. [2021-05-22 02:14:26,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1246 states, 1245 states have (on average 3.9710843373493976) internal successors, (4944), 1245 states have internal predecessors, (4944), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:26,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1246 states to 1246 states and 4944 transitions. [2021-05-22 02:14:26,857 INFO L78 Accepts]: Start accepts. Automaton has 1246 states and 4944 transitions. Word has length 22 [2021-05-22 02:14:26,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:26,857 INFO L482 AbstractCegarLoop]: Abstraction has 1246 states and 4944 transitions. [2021-05-22 02:14:26,857 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:26,857 INFO L276 IsEmpty]: Start isEmpty. Operand 1246 states and 4944 transitions. [2021-05-22 02:14:26,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:14:26,869 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:26,870 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, 1, 1] [2021-05-22 02:14:27,085 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-22 02:14:27,085 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:27,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:27,086 INFO L82 PathProgramCache]: Analyzing trace with hash -977644340, now seen corresponding path program 1 times [2021-05-22 02:14:27,086 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:27,086 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937710938] [2021-05-22 02:14:27,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:27,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:27,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:27,136 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:27,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937710938] [2021-05-22 02:14:27,137 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1937710938] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:27,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202556961] [2021-05-22 02:14:27,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 02:14:27,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:27,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-22 02:14:27,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:27,221 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:27,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1202556961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:27,221 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:27,221 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-05-22 02:14:27,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24296351] [2021-05-22 02:14:27,222 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:14:27,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:27,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:14:27,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:14:27,223 INFO L87 Difference]: Start difference. First operand 1246 states and 4944 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:27,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:27,344 INFO L93 Difference]: Finished difference Result 2518 states and 9792 transitions. [2021-05-22 02:14:27,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:14:27,345 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:27,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:27,366 INFO L225 Difference]: With dead ends: 2518 [2021-05-22 02:14:27,366 INFO L226 Difference]: Without dead ends: 2518 [2021-05-22 02:14:27,366 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 14.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:14:27,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2518 states. [2021-05-22 02:14:27,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2518 to 1535. [2021-05-22 02:14:27,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1535 states, 1534 states have (on average 4.046284224250326) internal successors, (6207), 1534 states have internal predecessors, (6207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:27,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1535 states to 1535 states and 6207 transitions. [2021-05-22 02:14:27,437 INFO L78 Accepts]: Start accepts. Automaton has 1535 states and 6207 transitions. Word has length 22 [2021-05-22 02:14:27,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:27,438 INFO L482 AbstractCegarLoop]: Abstraction has 1535 states and 6207 transitions. [2021-05-22 02:14:27,438 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:27,438 INFO L276 IsEmpty]: Start isEmpty. Operand 1535 states and 6207 transitions. [2021-05-22 02:14:27,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:14:27,444 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:27,444 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, 1, 1] [2021-05-22 02:14:27,660 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:14:27,661 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:27,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:27,661 INFO L82 PathProgramCache]: Analyzing trace with hash -1634054805, now seen corresponding path program 1 times [2021-05-22 02:14:27,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:27,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120660976] [2021-05-22 02:14:27,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:27,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:27,693 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:27,693 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:27,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120660976] [2021-05-22 02:14:27,693 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120660976] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:14:27,693 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:14:27,693 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-22 02:14:27,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977643252] [2021-05-22 02:14:27,694 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:14:27,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:27,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:14:27,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:14:27,694 INFO L87 Difference]: Start difference. First operand 1535 states and 6207 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:27,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:27,761 INFO L93 Difference]: Finished difference Result 2143 states and 8381 transitions. [2021-05-22 02:14:27,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:14:27,762 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:27,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:27,776 INFO L225 Difference]: With dead ends: 2143 [2021-05-22 02:14:27,777 INFO L226 Difference]: Without dead ends: 2120 [2021-05-22 02:14:27,777 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:14:27,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2120 states. [2021-05-22 02:14:27,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2120 to 1600. [2021-05-22 02:14:27,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1600 states, 1599 states have (on average 3.9987492182614135) internal successors, (6394), 1599 states have internal predecessors, (6394), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:27,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1600 states to 1600 states and 6394 transitions. [2021-05-22 02:14:27,857 INFO L78 Accepts]: Start accepts. Automaton has 1600 states and 6394 transitions. Word has length 22 [2021-05-22 02:14:27,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:27,857 INFO L482 AbstractCegarLoop]: Abstraction has 1600 states and 6394 transitions. [2021-05-22 02:14:27,857 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:27,857 INFO L276 IsEmpty]: Start isEmpty. Operand 1600 states and 6394 transitions. [2021-05-22 02:14:27,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:14:27,863 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:27,863 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, 1, 1] [2021-05-22 02:14:27,864 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-22 02:14:27,864 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:27,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:27,864 INFO L82 PathProgramCache]: Analyzing trace with hash 2015216124, now seen corresponding path program 1 times [2021-05-22 02:14:27,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:27,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736986358] [2021-05-22 02:14:27,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:27,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:27,886 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:27,886 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:27,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736986358] [2021-05-22 02:14:27,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [736986358] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:14:27,887 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:14:27,887 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-22 02:14:27,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665135292] [2021-05-22 02:14:27,887 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:14:27,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:27,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:14:27,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:14:27,888 INFO L87 Difference]: Start difference. First operand 1600 states and 6394 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:27,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:27,949 INFO L93 Difference]: Finished difference Result 2353 states and 9126 transitions. [2021-05-22 02:14:27,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:14:27,949 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:27,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:27,964 INFO L225 Difference]: With dead ends: 2353 [2021-05-22 02:14:27,964 INFO L226 Difference]: Without dead ends: 2337 [2021-05-22 02:14:27,965 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:14:27,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2337 states. [2021-05-22 02:14:28,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2337 to 1670. [2021-05-22 02:14:28,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1670 states, 1669 states have (on average 3.9622528460155784) internal successors, (6613), 1669 states have internal predecessors, (6613), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:28,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1670 states to 1670 states and 6613 transitions. [2021-05-22 02:14:28,028 INFO L78 Accepts]: Start accepts. Automaton has 1670 states and 6613 transitions. Word has length 22 [2021-05-22 02:14:28,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:28,029 INFO L482 AbstractCegarLoop]: Abstraction has 1670 states and 6613 transitions. [2021-05-22 02:14:28,029 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,029 INFO L276 IsEmpty]: Start isEmpty. Operand 1670 states and 6613 transitions. [2021-05-22 02:14:28,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:14:28,034 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:28,035 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, 1, 1] [2021-05-22 02:14:28,035 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-22 02:14:28,035 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:28,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:28,035 INFO L82 PathProgramCache]: Analyzing trace with hash 1699108399, now seen corresponding path program 2 times [2021-05-22 02:14:28,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:28,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788627515] [2021-05-22 02:14:28,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:28,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:28,058 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:28,058 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:28,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788627515] [2021-05-22 02:14:28,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788627515] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:14:28,058 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:14:28,058 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-22 02:14:28,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123785206] [2021-05-22 02:14:28,059 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:14:28,059 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:28,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:14:28,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:14:28,060 INFO L87 Difference]: Start difference. First operand 1670 states and 6613 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:28,136 INFO L93 Difference]: Finished difference Result 2314 states and 9023 transitions. [2021-05-22 02:14:28,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:14:28,137 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:28,152 INFO L225 Difference]: With dead ends: 2314 [2021-05-22 02:14:28,153 INFO L226 Difference]: Without dead ends: 2314 [2021-05-22 02:14:28,153 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:14:28,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2314 states. [2021-05-22 02:14:28,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2314 to 1847. [2021-05-22 02:14:28,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1847 states, 1846 states have (on average 3.978331527627302) internal successors, (7344), 1846 states have internal predecessors, (7344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:28,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1847 states to 1847 states and 7344 transitions. [2021-05-22 02:14:28,324 INFO L78 Accepts]: Start accepts. Automaton has 1847 states and 7344 transitions. Word has length 22 [2021-05-22 02:14:28,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:28,324 INFO L482 AbstractCegarLoop]: Abstraction has 1847 states and 7344 transitions. [2021-05-22 02:14:28,324 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,324 INFO L276 IsEmpty]: Start isEmpty. Operand 1847 states and 7344 transitions. [2021-05-22 02:14:28,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:14:28,331 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:28,331 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, 1, 1] [2021-05-22 02:14:28,332 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-22 02:14:28,332 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:28,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:28,332 INFO L82 PathProgramCache]: Analyzing trace with hash 1727272710, now seen corresponding path program 2 times [2021-05-22 02:14:28,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:28,332 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879806909] [2021-05-22 02:14:28,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:28,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:28,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:28,381 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:28,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879806909] [2021-05-22 02:14:28,381 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879806909] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:14:28,381 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:14:28,381 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-22 02:14:28,381 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573136668] [2021-05-22 02:14:28,382 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:14:28,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:28,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:14:28,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:14:28,383 INFO L87 Difference]: Start difference. First operand 1847 states and 7344 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:28,452 INFO L93 Difference]: Finished difference Result 2315 states and 8927 transitions. [2021-05-22 02:14:28,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:14:28,453 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:28,480 INFO L225 Difference]: With dead ends: 2315 [2021-05-22 02:14:28,480 INFO L226 Difference]: Without dead ends: 2297 [2021-05-22 02:14:28,480 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.8ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:14:28,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2297 states. [2021-05-22 02:14:28,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2297 to 1919. [2021-05-22 02:14:28,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1919 states, 1918 states have (on average 3.946298227320125) internal successors, (7569), 1918 states have internal predecessors, (7569), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:28,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1919 states to 1919 states and 7569 transitions. [2021-05-22 02:14:28,554 INFO L78 Accepts]: Start accepts. Automaton has 1919 states and 7569 transitions. Word has length 22 [2021-05-22 02:14:28,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:28,555 INFO L482 AbstractCegarLoop]: Abstraction has 1919 states and 7569 transitions. [2021-05-22 02:14:28,555 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,555 INFO L276 IsEmpty]: Start isEmpty. Operand 1919 states and 7569 transitions. [2021-05-22 02:14:28,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:14:28,561 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:28,561 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, 1, 1] [2021-05-22 02:14:28,561 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-22 02:14:28,562 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:28,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:28,562 INFO L82 PathProgramCache]: Analyzing trace with hash -264076448, now seen corresponding path program 2 times [2021-05-22 02:14:28,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:28,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832250188] [2021-05-22 02:14:28,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:28,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:28,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:28,587 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:28,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832250188] [2021-05-22 02:14:28,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832250188] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:14:28,588 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:14:28,588 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-22 02:14:28,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517177034] [2021-05-22 02:14:28,588 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:14:28,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:28,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:14:28,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:14:28,589 INFO L87 Difference]: Start difference. First operand 1919 states and 7569 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:28,665 INFO L93 Difference]: Finished difference Result 2879 states and 11172 transitions. [2021-05-22 02:14:28,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:14:28,666 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:28,678 INFO L225 Difference]: With dead ends: 2879 [2021-05-22 02:14:28,678 INFO L226 Difference]: Without dead ends: 2879 [2021-05-22 02:14:28,678 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:14:28,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2879 states. [2021-05-22 02:14:28,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2879 to 2176. [2021-05-22 02:14:28,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2176 states, 2175 states have (on average 3.964137931034483) internal successors, (8622), 2175 states have internal predecessors, (8622), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:28,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2176 states to 2176 states and 8622 transitions. [2021-05-22 02:14:28,762 INFO L78 Accepts]: Start accepts. Automaton has 2176 states and 8622 transitions. Word has length 22 [2021-05-22 02:14:28,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:28,763 INFO L482 AbstractCegarLoop]: Abstraction has 2176 states and 8622 transitions. [2021-05-22 02:14:28,763 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,764 INFO L276 IsEmpty]: Start isEmpty. Operand 2176 states and 8622 transitions. [2021-05-22 02:14:28,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:14:28,772 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:28,772 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, 1, 1] [2021-05-22 02:14:28,772 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-22 02:14:28,772 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:28,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:28,773 INFO L82 PathProgramCache]: Analyzing trace with hash 1299303677, now seen corresponding path program 2 times [2021-05-22 02:14:28,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:28,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570163513] [2021-05-22 02:14:28,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:28,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:28,808 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:28,809 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:28,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570163513] [2021-05-22 02:14:28,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570163513] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:14:28,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:14:28,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-22 02:14:28,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228570848] [2021-05-22 02:14:28,812 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:14:28,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:28,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:14:28,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:14:28,814 INFO L87 Difference]: Start difference. First operand 2176 states and 8622 transitions. Second operand has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:28,891 INFO L93 Difference]: Finished difference Result 2839 states and 10862 transitions. [2021-05-22 02:14:28,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:14:28,891 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:28,902 INFO L225 Difference]: With dead ends: 2839 [2021-05-22 02:14:28,902 INFO L226 Difference]: Without dead ends: 2811 [2021-05-22 02:14:28,902 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:14:28,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2811 states. [2021-05-22 02:14:28,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2811 to 2291. [2021-05-22 02:14:28,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2291 states, 2290 states have (on average 3.9375545851528386) internal successors, (9017), 2290 states have internal predecessors, (9017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:28,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2291 states to 2291 states and 9017 transitions. [2021-05-22 02:14:28,979 INFO L78 Accepts]: Start accepts. Automaton has 2291 states and 9017 transitions. Word has length 22 [2021-05-22 02:14:28,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:28,979 INFO L482 AbstractCegarLoop]: Abstraction has 2291 states and 9017 transitions. [2021-05-22 02:14:28,979 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.5) internal successors, (22), 3 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 02:14:28,979 INFO L276 IsEmpty]: Start isEmpty. Operand 2291 states and 9017 transitions. [2021-05-22 02:14:29,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-22 02:14:29,019 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:29,019 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, 1, 1, 1, 1, 1] [2021-05-22 02:14:29,019 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-22 02:14:29,019 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:29,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:29,020 INFO L82 PathProgramCache]: Analyzing trace with hash -2040256713, now seen corresponding path program 1 times [2021-05-22 02:14:29,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:29,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044635482] [2021-05-22 02:14:29,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:29,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:29,082 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:29,082 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:29,082 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044635482] [2021-05-22 02:14:29,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044635482] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:29,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1520184972] [2021-05-22 02:14:29,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 02:14:29,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:29,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 02:14:29,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:29,370 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:29,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1520184972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:29,370 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:29,370 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6] total 6 [2021-05-22 02:14:29,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288759041] [2021-05-22 02:14:29,371 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 02:14:29,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:29,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 02:14:29,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:14:29,372 INFO L87 Difference]: Start difference. First operand 2291 states and 9017 transitions. Second operand has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:29,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:29,632 INFO L93 Difference]: Finished difference Result 3791 states and 14505 transitions. [2021-05-22 02:14:29,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-22 02:14:29,632 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-05-22 02:14:29,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:29,647 INFO L225 Difference]: With dead ends: 3791 [2021-05-22 02:14:29,647 INFO L226 Difference]: Without dead ends: 3655 [2021-05-22 02:14:29,647 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 4 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 73.2ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:14:29,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3655 states. [2021-05-22 02:14:29,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3655 to 2656. [2021-05-22 02:14:29,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2656 states, 2655 states have (on average 3.9450094161958567) internal successors, (10474), 2655 states have internal predecessors, (10474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:29,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2656 states to 2656 states and 10474 transitions. [2021-05-22 02:14:29,752 INFO L78 Accepts]: Start accepts. Automaton has 2656 states and 10474 transitions. Word has length 25 [2021-05-22 02:14:29,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:29,753 INFO L482 AbstractCegarLoop]: Abstraction has 2656 states and 10474 transitions. [2021-05-22 02:14:29,753 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:29,753 INFO L276 IsEmpty]: Start isEmpty. Operand 2656 states and 10474 transitions. [2021-05-22 02:14:29,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-22 02:14:29,762 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:29,762 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, 1, 1, 1, 1, 1] [2021-05-22 02:14:29,989 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-22 02:14:29,989 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:29,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:29,990 INFO L82 PathProgramCache]: Analyzing trace with hash -993904687, now seen corresponding path program 2 times [2021-05-22 02:14:29,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:29,990 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690133072] [2021-05-22 02:14:29,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:29,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:30,075 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:14:30,076 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:30,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690133072] [2021-05-22 02:14:30,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [690133072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:30,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957685651] [2021-05-22 02:14:30,076 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 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 02:14:30,121 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:14:30,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:30,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 02:14:30,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:30,384 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:30,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957685651] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:30,384 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:30,384 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6] total 7 [2021-05-22 02:14:30,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366868781] [2021-05-22 02:14:30,385 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-22 02:14:30,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:30,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-22 02:14:30,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:14:30,386 INFO L87 Difference]: Start difference. First operand 2656 states and 10474 transitions. Second operand has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:30,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:30,629 INFO L93 Difference]: Finished difference Result 4004 states and 15422 transitions. [2021-05-22 02:14:30,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:14:30,630 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-05-22 02:14:30,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:30,643 INFO L225 Difference]: With dead ends: 4004 [2021-05-22 02:14:30,643 INFO L226 Difference]: Without dead ends: 3868 [2021-05-22 02:14:30,643 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 112.3ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:14:30,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3868 states. [2021-05-22 02:14:30,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3868 to 2991. [2021-05-22 02:14:30,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2991 states, 2990 states have (on average 3.9638795986622073) internal successors, (11852), 2990 states have internal predecessors, (11852), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:30,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2991 states to 2991 states and 11852 transitions. [2021-05-22 02:14:30,725 INFO L78 Accepts]: Start accepts. Automaton has 2991 states and 11852 transitions. Word has length 25 [2021-05-22 02:14:30,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:30,725 INFO L482 AbstractCegarLoop]: Abstraction has 2991 states and 11852 transitions. [2021-05-22 02:14:30,726 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:30,726 INFO L276 IsEmpty]: Start isEmpty. Operand 2991 states and 11852 transitions. [2021-05-22 02:14:30,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-22 02:14:30,733 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:30,733 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, 1, 1, 1, 1, 1] [2021-05-22 02:14:30,948 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:14:30,949 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:30,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:30,950 INFO L82 PathProgramCache]: Analyzing trace with hash 455681823, now seen corresponding path program 3 times [2021-05-22 02:14:30,950 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:30,950 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55418574] [2021-05-22 02:14:30,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:30,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:31,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 02:14:31,010 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:31,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55418574] [2021-05-22 02:14:31,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [55418574] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:14:31,010 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:14:31,010 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-22 02:14:31,010 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688639441] [2021-05-22 02:14:31,011 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:14:31,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:31,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:14:31,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:14:31,011 INFO L87 Difference]: Start difference. First operand 2991 states and 11852 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 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 02:14:31,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:31,168 INFO L93 Difference]: Finished difference Result 4207 states and 16326 transitions. [2021-05-22 02:14:31,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:14:31,168 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 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 25 [2021-05-22 02:14:31,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:31,182 INFO L225 Difference]: With dead ends: 4207 [2021-05-22 02:14:31,183 INFO L226 Difference]: Without dead ends: 4139 [2021-05-22 02:14:31,183 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.6ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:14:31,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4139 states. [2021-05-22 02:14:31,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4139 to 3438. [2021-05-22 02:14:31,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3438 states, 3437 states have (on average 3.9793424498108814) internal successors, (13677), 3437 states have internal predecessors, (13677), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:31,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3438 states to 3438 states and 13677 transitions. [2021-05-22 02:14:31,283 INFO L78 Accepts]: Start accepts. Automaton has 3438 states and 13677 transitions. Word has length 25 [2021-05-22 02:14:31,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:31,284 INFO L482 AbstractCegarLoop]: Abstraction has 3438 states and 13677 transitions. [2021-05-22 02:14:31,284 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 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 02:14:31,284 INFO L276 IsEmpty]: Start isEmpty. Operand 3438 states and 13677 transitions. [2021-05-22 02:14:31,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-22 02:14:31,291 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:31,291 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, 1, 1, 1, 1, 1] [2021-05-22 02:14:31,291 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-22 02:14:31,291 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:31,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:31,292 INFO L82 PathProgramCache]: Analyzing trace with hash -91124313, now seen corresponding path program 1 times [2021-05-22 02:14:31,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:31,292 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509914478] [2021-05-22 02:14:31,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:31,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:31,342 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:31,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:31,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509914478] [2021-05-22 02:14:31,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509914478] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:31,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248407656] [2021-05-22 02:14:31,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 02:14:31,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:31,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 02:14:31,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:31,525 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:31,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248407656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:31,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:31,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6] total 6 [2021-05-22 02:14:31,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855290760] [2021-05-22 02:14:31,526 INFO L462 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-22 02:14:31,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:31,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-22 02:14:31,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:14:31,526 INFO L87 Difference]: Start difference. First operand 3438 states and 13677 transitions. Second operand has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:31,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:31,793 INFO L93 Difference]: Finished difference Result 4729 states and 18310 transitions. [2021-05-22 02:14:31,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-22 02:14:31,794 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-05-22 02:14:31,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:31,810 INFO L225 Difference]: With dead ends: 4729 [2021-05-22 02:14:31,810 INFO L226 Difference]: Without dead ends: 4627 [2021-05-22 02:14:31,811 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 4 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 63.3ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:14:31,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4627 states. [2021-05-22 02:14:31,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4627 to 3870. [2021-05-22 02:14:31,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3870 states, 3869 states have (on average 3.958904109589041) internal successors, (15317), 3869 states have internal predecessors, (15317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:31,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3870 states to 3870 states and 15317 transitions. [2021-05-22 02:14:31,913 INFO L78 Accepts]: Start accepts. Automaton has 3870 states and 15317 transitions. Word has length 25 [2021-05-22 02:14:31,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:31,913 INFO L482 AbstractCegarLoop]: Abstraction has 3870 states and 15317 transitions. [2021-05-22 02:14:31,913 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:31,913 INFO L276 IsEmpty]: Start isEmpty. Operand 3870 states and 15317 transitions. [2021-05-22 02:14:31,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-22 02:14:31,923 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:31,923 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, 1, 1, 1, 1, 1] [2021-05-22 02:14:32,140 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-22 02:14:32,141 INFO L430 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:32,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:32,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1468953723, now seen corresponding path program 2 times [2021-05-22 02:14:32,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:32,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [748797643] [2021-05-22 02:14:32,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:32,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:32,185 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:14:32,185 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:32,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [748797643] [2021-05-22 02:14:32,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [748797643] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:32,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766732176] [2021-05-22 02:14:32,186 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 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 02:14:32,217 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:14:32,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:32,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-22 02:14:32,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:32,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:32,372 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766732176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:32,372 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:32,372 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6] total 7 [2021-05-22 02:14:32,372 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126706334] [2021-05-22 02:14:32,372 INFO L462 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-22 02:14:32,373 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:32,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-22 02:14:32,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:14:32,373 INFO L87 Difference]: Start difference. First operand 3870 states and 15317 transitions. Second operand has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:32,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:32,669 INFO L93 Difference]: Finished difference Result 4946 states and 19222 transitions. [2021-05-22 02:14:32,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:14:32,669 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-05-22 02:14:32,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:32,686 INFO L225 Difference]: With dead ends: 4946 [2021-05-22 02:14:32,686 INFO L226 Difference]: Without dead ends: 4844 [2021-05-22 02:14:32,686 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 86.6ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-22 02:14:32,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4844 states. [2021-05-22 02:14:32,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4844 to 4195. [2021-05-22 02:14:32,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4195 states, 4194 states have (on average 3.966618979494516) internal successors, (16636), 4194 states have internal predecessors, (16636), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:32,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4195 states to 4195 states and 16636 transitions. [2021-05-22 02:14:32,788 INFO L78 Accepts]: Start accepts. Automaton has 4195 states and 16636 transitions. Word has length 25 [2021-05-22 02:14:32,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:32,788 INFO L482 AbstractCegarLoop]: Abstraction has 4195 states and 16636 transitions. [2021-05-22 02:14:32,788 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:32,788 INFO L276 IsEmpty]: Start isEmpty. Operand 4195 states and 16636 transitions. [2021-05-22 02:14:32,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-22 02:14:32,797 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:32,797 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, 1, 1, 1, 1, 1] [2021-05-22 02:14:33,020 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:14:33,020 INFO L430 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:33,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:33,021 INFO L82 PathProgramCache]: Analyzing trace with hash -466013585, now seen corresponding path program 3 times [2021-05-22 02:14:33,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:33,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140783305] [2021-05-22 02:14:33,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:33,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:33,082 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 02:14:33,083 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:33,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140783305] [2021-05-22 02:14:33,083 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [140783305] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:14:33,083 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:14:33,083 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-22 02:14:33,083 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750591609] [2021-05-22 02:14:33,083 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:14:33,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:33,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:14:33,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:14:33,084 INFO L87 Difference]: Start difference. First operand 4195 states and 16636 transitions. Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 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 02:14:33,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:33,212 INFO L93 Difference]: Finished difference Result 5169 states and 20167 transitions. [2021-05-22 02:14:33,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:14:33,213 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 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 25 [2021-05-22 02:14:33,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:33,230 INFO L225 Difference]: With dead ends: 5169 [2021-05-22 02:14:33,230 INFO L226 Difference]: Without dead ends: 5118 [2021-05-22 02:14:33,230 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.1ms TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:14:33,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5118 states. [2021-05-22 02:14:33,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5118 to 4611. [2021-05-22 02:14:33,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4611 states, 4610 states have (on average 3.9731019522776574) internal successors, (18316), 4610 states have internal predecessors, (18316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:33,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4611 states to 4611 states and 18316 transitions. [2021-05-22 02:14:33,337 INFO L78 Accepts]: Start accepts. Automaton has 4611 states and 18316 transitions. Word has length 25 [2021-05-22 02:14:33,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:33,338 INFO L482 AbstractCegarLoop]: Abstraction has 4611 states and 18316 transitions. [2021-05-22 02:14:33,338 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 4 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 02:14:33,338 INFO L276 IsEmpty]: Start isEmpty. Operand 4611 states and 18316 transitions. [2021-05-22 02:14:33,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:33,348 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:33,348 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:33,348 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-22 02:14:33,348 INFO L430 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:33,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:33,349 INFO L82 PathProgramCache]: Analyzing trace with hash -1201507300, now seen corresponding path program 4 times [2021-05-22 02:14:33,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:33,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1312258326] [2021-05-22 02:14:33,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:33,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:33,395 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:33,396 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:33,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1312258326] [2021-05-22 02:14:33,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1312258326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:33,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [911479586] [2021-05-22 02:14:33,396 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 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 02:14:33,427 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:14:33,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:33,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:33,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:33,524 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:33,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [911479586] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:33,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:33,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-05-22 02:14:33,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256239761] [2021-05-22 02:14:33,525 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:14:33,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:33,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:14:33,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:14:33,526 INFO L87 Difference]: Start difference. First operand 4611 states and 18316 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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 02:14:34,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:34,534 INFO L93 Difference]: Finished difference Result 11402 states and 44327 transitions. [2021-05-22 02:14:34,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-22 02:14:34,534 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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 28 [2021-05-22 02:14:34,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:34,577 INFO L225 Difference]: With dead ends: 11402 [2021-05-22 02:14:34,577 INFO L226 Difference]: Without dead ends: 11402 [2021-05-22 02:14:34,577 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 396.2ms TimeCoverageRelationStatistics Valid=267, Invalid=923, Unknown=0, NotChecked=0, Total=1190 [2021-05-22 02:14:34,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11402 states. [2021-05-22 02:14:34,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11402 to 5821. [2021-05-22 02:14:34,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5821 states, 5820 states have (on average 4.016151202749141) internal successors, (23374), 5820 states have internal predecessors, (23374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:34,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5821 states to 5821 states and 23374 transitions. [2021-05-22 02:14:34,769 INFO L78 Accepts]: Start accepts. Automaton has 5821 states and 23374 transitions. Word has length 28 [2021-05-22 02:14:34,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:34,769 INFO L482 AbstractCegarLoop]: Abstraction has 5821 states and 23374 transitions. [2021-05-22 02:14:34,769 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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 02:14:34,769 INFO L276 IsEmpty]: Start isEmpty. Operand 5821 states and 23374 transitions. [2021-05-22 02:14:34,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:34,782 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:34,782 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:35,007 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-22 02:14:35,007 INFO L430 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:35,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:35,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1181914093, now seen corresponding path program 5 times [2021-05-22 02:14:35,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:35,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114919533] [2021-05-22 02:14:35,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:35,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:35,051 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:35,051 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:35,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114919533] [2021-05-22 02:14:35,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [114919533] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:35,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783942855] [2021-05-22 02:14:35,052 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 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 02:14:35,095 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:14:35,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:35,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:35,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:35,187 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:35,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783942855] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:35,188 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:35,188 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-05-22 02:14:35,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350327842] [2021-05-22 02:14:35,188 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:14:35,189 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:35,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:14:35,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:14:35,189 INFO L87 Difference]: Start difference. First operand 5821 states and 23374 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:14:36,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:36,024 INFO L93 Difference]: Finished difference Result 15383 states and 58771 transitions. [2021-05-22 02:14:36,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-22 02:14:36,025 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 28 [2021-05-22 02:14:36,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:36,077 INFO L225 Difference]: With dead ends: 15383 [2021-05-22 02:14:36,077 INFO L226 Difference]: Without dead ends: 15203 [2021-05-22 02:14:36,078 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 360.3ms TimeCoverageRelationStatistics Valid=229, Invalid=827, Unknown=0, NotChecked=0, Total=1056 [2021-05-22 02:14:36,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15203 states. [2021-05-22 02:14:36,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15203 to 8319. [2021-05-22 02:14:36,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8319 states, 8318 states have (on average 4.118177446501563) internal successors, (34255), 8318 states have internal predecessors, (34255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:36,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8319 states to 8319 states and 34255 transitions. [2021-05-22 02:14:36,433 INFO L78 Accepts]: Start accepts. Automaton has 8319 states and 34255 transitions. Word has length 28 [2021-05-22 02:14:36,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:36,433 INFO L482 AbstractCegarLoop]: Abstraction has 8319 states and 34255 transitions. [2021-05-22 02:14:36,433 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:14:36,433 INFO L276 IsEmpty]: Start isEmpty. Operand 8319 states and 34255 transitions. [2021-05-22 02:14:36,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:36,455 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:36,455 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:36,680 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-22 02:14:36,680 INFO L430 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:36,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:36,681 INFO L82 PathProgramCache]: Analyzing trace with hash 1237707597, now seen corresponding path program 6 times [2021-05-22 02:14:36,681 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:36,681 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650148004] [2021-05-22 02:14:36,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:36,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:36,714 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:36,714 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:36,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650148004] [2021-05-22 02:14:36,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650148004] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:36,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755806182] [2021-05-22 02:14:36,714 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 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 02:14:36,748 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:14:36,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:36,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:36,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:36,854 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:36,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1755806182] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:36,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:36,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:14:36,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703436482] [2021-05-22 02:14:36,855 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:14:36,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:36,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:14:36,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:14:36,856 INFO L87 Difference]: Start difference. First operand 8319 states and 34255 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:37,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:37,351 INFO L93 Difference]: Finished difference Result 16184 states and 62633 transitions. [2021-05-22 02:14:37,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:14:37,351 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:37,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:37,392 INFO L225 Difference]: With dead ends: 16184 [2021-05-22 02:14:37,393 INFO L226 Difference]: Without dead ends: 16184 [2021-05-22 02:14:37,393 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 189.8ms TimeCoverageRelationStatistics Valid=112, Invalid=350, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:14:37,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16184 states. [2021-05-22 02:14:37,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16184 to 8319. [2021-05-22 02:14:37,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8319 states, 8318 states have (on average 4.099062274585237) internal successors, (34096), 8318 states have internal predecessors, (34096), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:37,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8319 states to 8319 states and 34096 transitions. [2021-05-22 02:14:37,713 INFO L78 Accepts]: Start accepts. Automaton has 8319 states and 34096 transitions. Word has length 28 [2021-05-22 02:14:37,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:37,714 INFO L482 AbstractCegarLoop]: Abstraction has 8319 states and 34096 transitions. [2021-05-22 02:14:37,714 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:37,714 INFO L276 IsEmpty]: Start isEmpty. Operand 8319 states and 34096 transitions. [2021-05-22 02:14:37,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:37,739 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:37,739 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:37,952 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-22 02:14:37,953 INFO L430 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:37,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:37,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1493879574, now seen corresponding path program 7 times [2021-05-22 02:14:37,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:37,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877735393] [2021-05-22 02:14:37,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:37,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:37,989 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:37,989 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:37,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877735393] [2021-05-22 02:14:37,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [877735393] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:37,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050485657] [2021-05-22 02:14:37,990 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 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 02:14:38,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:38,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:38,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:38,107 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:38,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050485657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:38,107 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:38,107 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:14:38,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285031552] [2021-05-22 02:14:38,107 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:14:38,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:38,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:14:38,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:14:38,108 INFO L87 Difference]: Start difference. First operand 8319 states and 34096 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:38,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:38,445 INFO L93 Difference]: Finished difference Result 10083 states and 39959 transitions. [2021-05-22 02:14:38,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:14:38,445 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:38,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:38,468 INFO L225 Difference]: With dead ends: 10083 [2021-05-22 02:14:38,468 INFO L226 Difference]: Without dead ends: 10027 [2021-05-22 02:14:38,469 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 104.2ms TimeCoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:14:38,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10027 states. [2021-05-22 02:14:38,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10027 to 8326. [2021-05-22 02:14:38,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8326 states, 8325 states have (on average 4.095975975975976) internal successors, (34099), 8325 states have internal predecessors, (34099), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:38,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8326 states to 8326 states and 34099 transitions. [2021-05-22 02:14:38,707 INFO L78 Accepts]: Start accepts. Automaton has 8326 states and 34099 transitions. Word has length 28 [2021-05-22 02:14:38,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:38,707 INFO L482 AbstractCegarLoop]: Abstraction has 8326 states and 34099 transitions. [2021-05-22 02:14:38,707 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:38,707 INFO L276 IsEmpty]: Start isEmpty. Operand 8326 states and 34099 transitions. [2021-05-22 02:14:38,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:38,722 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:38,722 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:38,922 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:14:38,923 INFO L430 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:38,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:38,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1541673924, now seen corresponding path program 8 times [2021-05-22 02:14:38,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:38,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318464427] [2021-05-22 02:14:38,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:38,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:38,949 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:14:38,949 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:38,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318464427] [2021-05-22 02:14:38,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1318464427] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:38,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093330881] [2021-05-22 02:14:38,950 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 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 02:14:38,985 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:14:38,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:38,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:38,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:39,107 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:39,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093330881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:39,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:39,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 9 [2021-05-22 02:14:39,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346837779] [2021-05-22 02:14:39,108 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:14:39,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:39,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:14:39,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:14:39,109 INFO L87 Difference]: Start difference. First operand 8326 states and 34099 transitions. Second operand has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:39,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:39,646 INFO L93 Difference]: Finished difference Result 17529 states and 67736 transitions. [2021-05-22 02:14:39,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-22 02:14:39,647 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:39,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:39,773 INFO L225 Difference]: With dead ends: 17529 [2021-05-22 02:14:39,773 INFO L226 Difference]: Without dead ends: 17529 [2021-05-22 02:14:39,773 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 164.8ms TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:14:39,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17529 states. [2021-05-22 02:14:40,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17529 to 8432. [2021-05-22 02:14:40,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8432 states, 8431 states have (on average 4.087296880559839) internal successors, (34460), 8431 states have internal predecessors, (34460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:40,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8432 states to 8432 states and 34460 transitions. [2021-05-22 02:14:40,112 INFO L78 Accepts]: Start accepts. Automaton has 8432 states and 34460 transitions. Word has length 28 [2021-05-22 02:14:40,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:40,112 INFO L482 AbstractCegarLoop]: Abstraction has 8432 states and 34460 transitions. [2021-05-22 02:14:40,112 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:40,112 INFO L276 IsEmpty]: Start isEmpty. Operand 8432 states and 34460 transitions. [2021-05-22 02:14:40,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:40,133 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:40,133 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:40,356 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:14:40,358 INFO L430 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:40,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:40,358 INFO L82 PathProgramCache]: Analyzing trace with hash 182486291, now seen corresponding path program 9 times [2021-05-22 02:14:40,358 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:40,358 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257068188] [2021-05-22 02:14:40,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:40,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:40,498 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:14:40,498 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:40,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257068188] [2021-05-22 02:14:40,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1257068188] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:40,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205822799] [2021-05-22 02:14:40,498 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 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 02:14:40,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:14:40,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:40,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:40,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:40,699 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:40,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [205822799] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:40,699 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:40,700 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 9 [2021-05-22 02:14:40,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460638932] [2021-05-22 02:14:40,700 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:14:40,700 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:40,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:14:40,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:14:40,701 INFO L87 Difference]: Start difference. First operand 8432 states and 34460 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:41,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:41,361 INFO L93 Difference]: Finished difference Result 15647 states and 60285 transitions. [2021-05-22 02:14:41,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-22 02:14:41,362 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:41,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:41,398 INFO L225 Difference]: With dead ends: 15647 [2021-05-22 02:14:41,398 INFO L226 Difference]: Without dead ends: 15587 [2021-05-22 02:14:41,399 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 206.4ms TimeCoverageRelationStatistics Valid=144, Invalid=456, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:14:41,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15587 states. [2021-05-22 02:14:41,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15587 to 8432. [2021-05-22 02:14:41,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8432 states, 8431 states have (on average 4.084924682718539) internal successors, (34440), 8431 states have internal predecessors, (34440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:41,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8432 states to 8432 states and 34440 transitions. [2021-05-22 02:14:41,649 INFO L78 Accepts]: Start accepts. Automaton has 8432 states and 34440 transitions. Word has length 28 [2021-05-22 02:14:41,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:41,649 INFO L482 AbstractCegarLoop]: Abstraction has 8432 states and 34440 transitions. [2021-05-22 02:14:41,649 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:41,649 INFO L276 IsEmpty]: Start isEmpty. Operand 8432 states and 34440 transitions. [2021-05-22 02:14:41,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:41,663 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:41,663 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:41,941 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:14:41,941 INFO L430 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:41,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:41,941 INFO L82 PathProgramCache]: Analyzing trace with hash -789657513, now seen corresponding path program 10 times [2021-05-22 02:14:41,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:41,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707736071] [2021-05-22 02:14:41,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:41,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:41,991 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:41,991 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:41,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707736071] [2021-05-22 02:14:41,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707736071] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:41,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410186351] [2021-05-22 02:14:41,992 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 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 02:14:42,031 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:14:42,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:42,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:42,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:42,163 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:42,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410186351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:42,163 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:42,163 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 9 [2021-05-22 02:14:42,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144315839] [2021-05-22 02:14:42,164 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:14:42,164 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:42,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:14:42,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:14:42,165 INFO L87 Difference]: Start difference. First operand 8432 states and 34440 transitions. Second operand has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:42,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:42,983 INFO L93 Difference]: Finished difference Result 18798 states and 72632 transitions. [2021-05-22 02:14:42,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-22 02:14:42,983 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:42,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:43,052 INFO L225 Difference]: With dead ends: 18798 [2021-05-22 02:14:43,052 INFO L226 Difference]: Without dead ends: 18798 [2021-05-22 02:14:43,053 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 149 ImplicationChecksByTransitivity, 253.3ms TimeCoverageRelationStatistics Valid=184, Invalid=572, Unknown=0, NotChecked=0, Total=756 [2021-05-22 02:14:43,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18798 states. [2021-05-22 02:14:43,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18798 to 8538. [2021-05-22 02:14:43,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8538 states, 8537 states have (on average 4.08269884034204) internal successors, (34854), 8537 states have internal predecessors, (34854), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:43,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8538 states to 8538 states and 34854 transitions. [2021-05-22 02:14:43,422 INFO L78 Accepts]: Start accepts. Automaton has 8538 states and 34854 transitions. Word has length 28 [2021-05-22 02:14:43,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:43,422 INFO L482 AbstractCegarLoop]: Abstraction has 8538 states and 34854 transitions. [2021-05-22 02:14:43,422 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:43,422 INFO L276 IsEmpty]: Start isEmpty. Operand 8538 states and 34854 transitions. [2021-05-22 02:14:43,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:43,438 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:43,438 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:43,649 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-22 02:14:43,649 INFO L430 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:43,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:43,649 INFO L82 PathProgramCache]: Analyzing trace with hash 773722612, now seen corresponding path program 11 times [2021-05-22 02:14:43,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:43,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546741406] [2021-05-22 02:14:43,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:43,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:43,738 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:43,738 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:43,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546741406] [2021-05-22 02:14:43,738 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546741406] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:43,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312239477] [2021-05-22 02:14:43,738 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 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 02:14:43,765 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:14:43,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:43,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:43,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:43,884 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:43,884 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312239477] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:43,884 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:43,885 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 9 [2021-05-22 02:14:43,885 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700558584] [2021-05-22 02:14:43,885 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:14:43,885 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:43,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:14:43,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:14:43,886 INFO L87 Difference]: Start difference. First operand 8538 states and 34854 transitions. Second operand has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:44,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:44,327 INFO L93 Difference]: Finished difference Result 14070 states and 54143 transitions. [2021-05-22 02:14:44,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:14:44,327 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:44,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:44,366 INFO L225 Difference]: With dead ends: 14070 [2021-05-22 02:14:44,366 INFO L226 Difference]: Without dead ends: 14014 [2021-05-22 02:14:44,366 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 141.6ms TimeCoverageRelationStatistics Valid=115, Invalid=391, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:14:44,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14014 states. [2021-05-22 02:14:44,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14014 to 8538. [2021-05-22 02:14:44,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8538 states, 8537 states have (on average 4.080356096989575) internal successors, (34834), 8537 states have internal predecessors, (34834), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:44,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8538 states to 8538 states and 34834 transitions. [2021-05-22 02:14:44,699 INFO L78 Accepts]: Start accepts. Automaton has 8538 states and 34834 transitions. Word has length 28 [2021-05-22 02:14:44,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:44,699 INFO L482 AbstractCegarLoop]: Abstraction has 8538 states and 34834 transitions. [2021-05-22 02:14:44,699 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.6) internal successors, (36), 9 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:44,699 INFO L276 IsEmpty]: Start isEmpty. Operand 8538 states and 34834 transitions. [2021-05-22 02:14:44,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:44,719 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:44,719 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:44,932 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:14:44,933 INFO L430 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:44,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:44,933 INFO L82 PathProgramCache]: Analyzing trace with hash 47154117, now seen corresponding path program 12 times [2021-05-22 02:14:44,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:44,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744200721] [2021-05-22 02:14:44,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:44,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:44,969 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:44,969 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:44,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744200721] [2021-05-22 02:14:44,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744200721] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:44,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031838952] [2021-05-22 02:14:44,969 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 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 02:14:45,001 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:14:45,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:45,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:45,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:45,119 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:45,120 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031838952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:45,120 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:45,120 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-05-22 02:14:45,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562743433] [2021-05-22 02:14:45,120 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:14:45,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:45,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:14:45,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:14:45,121 INFO L87 Difference]: Start difference. First operand 8538 states and 34834 transitions. Second operand has 11 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:46,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:46,117 INFO L93 Difference]: Finished difference Result 18926 states and 73169 transitions. [2021-05-22 02:14:46,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-22 02:14:46,118 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:46,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:46,169 INFO L225 Difference]: With dead ends: 18926 [2021-05-22 02:14:46,169 INFO L226 Difference]: Without dead ends: 18926 [2021-05-22 02:14:46,169 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 293.7ms TimeCoverageRelationStatistics Valid=215, Invalid=777, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:14:46,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18926 states. [2021-05-22 02:14:46,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18926 to 8689. [2021-05-22 02:14:46,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8689 states, 8688 states have (on average 4.058586556169429) internal successors, (35261), 8688 states have internal predecessors, (35261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:46,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8689 states to 8689 states and 35261 transitions. [2021-05-22 02:14:46,447 INFO L78 Accepts]: Start accepts. Automaton has 8689 states and 35261 transitions. Word has length 28 [2021-05-22 02:14:46,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:46,448 INFO L482 AbstractCegarLoop]: Abstraction has 8689 states and 35261 transitions. [2021-05-22 02:14:46,448 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.1818181818181817) internal successors, (35), 10 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:46,448 INFO L276 IsEmpty]: Start isEmpty. Operand 8689 states and 35261 transitions. [2021-05-22 02:14:46,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:46,468 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:46,468 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:46,691 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-22 02:14:46,692 INFO L430 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:46,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:46,692 INFO L82 PathProgramCache]: Analyzing trace with hash 407339324, now seen corresponding path program 13 times [2021-05-22 02:14:46,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:46,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728648889] [2021-05-22 02:14:46,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:46,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:46,731 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:46,732 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:46,732 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728648889] [2021-05-22 02:14:46,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728648889] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:46,732 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1744298796] [2021-05-22 02:14:46,732 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 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 02:14:46,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:46,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:46,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:46,872 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:46,873 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1744298796] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:46,873 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:46,873 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-05-22 02:14:46,873 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811510716] [2021-05-22 02:14:46,873 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:14:46,873 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:46,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:14:46,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:14:46,874 INFO L87 Difference]: Start difference. First operand 8689 states and 35261 transitions. Second operand has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:47,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:47,597 INFO L93 Difference]: Finished difference Result 12612 states and 48542 transitions. [2021-05-22 02:14:47,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:14:47,597 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:47,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:47,640 INFO L225 Difference]: With dead ends: 12612 [2021-05-22 02:14:47,640 INFO L226 Difference]: Without dead ends: 12556 [2021-05-22 02:14:47,640 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 193.8ms TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:14:47,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12556 states. [2021-05-22 02:14:47,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12556 to 8811. [2021-05-22 02:14:47,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8811 states, 8810 states have (on average 4.050397275822928) internal successors, (35684), 8810 states have internal predecessors, (35684), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:47,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8811 states to 8811 states and 35684 transitions. [2021-05-22 02:14:47,905 INFO L78 Accepts]: Start accepts. Automaton has 8811 states and 35684 transitions. Word has length 28 [2021-05-22 02:14:47,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:47,905 INFO L482 AbstractCegarLoop]: Abstraction has 8811 states and 35684 transitions. [2021-05-22 02:14:47,905 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.272727272727273) internal successors, (36), 10 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:47,905 INFO L276 IsEmpty]: Start isEmpty. Operand 8811 states and 35684 transitions. [2021-05-22 02:14:47,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:47,923 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:47,923 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:48,136 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:14:48,137 INFO L430 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:48,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:48,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1488851502, now seen corresponding path program 14 times [2021-05-22 02:14:48,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:48,137 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196657262] [2021-05-22 02:14:48,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:48,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:48,168 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:14:48,168 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:48,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196657262] [2021-05-22 02:14:48,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196657262] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:48,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1899033139] [2021-05-22 02:14:48,169 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 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 02:14:48,202 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:14:48,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:48,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:48,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:48,318 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:48,318 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1899033139] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:48,318 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:48,318 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:14:48,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763404567] [2021-05-22 02:14:48,319 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:14:48,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:48,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:14:48,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:14:48,320 INFO L87 Difference]: Start difference. First operand 8811 states and 35684 transitions. Second operand has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:48,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:48,763 INFO L93 Difference]: Finished difference Result 16530 states and 63291 transitions. [2021-05-22 02:14:48,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-22 02:14:48,763 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:48,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:48,815 INFO L225 Difference]: With dead ends: 16530 [2021-05-22 02:14:48,815 INFO L226 Difference]: Without dead ends: 16530 [2021-05-22 02:14:48,816 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 140.0ms TimeCoverageRelationStatistics Valid=95, Invalid=325, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:14:48,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16530 states. [2021-05-22 02:14:49,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16530 to 8811. [2021-05-22 02:14:49,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8811 states, 8810 states have (on average 4.044381384790011) internal successors, (35631), 8810 states have internal predecessors, (35631), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:49,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8811 states to 8811 states and 35631 transitions. [2021-05-22 02:14:49,072 INFO L78 Accepts]: Start accepts. Automaton has 8811 states and 35631 transitions. Word has length 28 [2021-05-22 02:14:49,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:49,072 INFO L482 AbstractCegarLoop]: Abstraction has 8811 states and 35631 transitions. [2021-05-22 02:14:49,073 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:49,073 INFO L276 IsEmpty]: Start isEmpty. Operand 8811 states and 35631 transitions. [2021-05-22 02:14:49,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:49,089 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:49,089 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:49,289 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-22 02:14:49,290 INFO L430 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:49,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:49,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1081955579, now seen corresponding path program 15 times [2021-05-22 02:14:49,290 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:49,290 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427192836] [2021-05-22 02:14:49,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:49,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:49,314 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:14:49,315 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:49,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427192836] [2021-05-22 02:14:49,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427192836] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:49,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547887494] [2021-05-22 02:14:49,315 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 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 02:14:49,356 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:14:49,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:49,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:49,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:49,446 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:49,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1547887494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:49,446 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:49,446 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:14:49,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753573982] [2021-05-22 02:14:49,446 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:14:49,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:49,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:14:49,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:14:49,447 INFO L87 Difference]: Start difference. First operand 8811 states and 35631 transitions. Second operand has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 02:14:49,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:49,776 INFO L93 Difference]: Finished difference Result 11652 states and 45517 transitions. [2021-05-22 02:14:49,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:14:49,777 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 28 [2021-05-22 02:14:49,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:49,806 INFO L225 Difference]: With dead ends: 11652 [2021-05-22 02:14:49,807 INFO L226 Difference]: Without dead ends: 11632 [2021-05-22 02:14:49,807 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 92.7ms TimeCoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:14:49,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11632 states. [2021-05-22 02:14:50,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11632 to 8811. [2021-05-22 02:14:50,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8811 states, 8810 states have (on average 4.043246311010216) internal successors, (35621), 8810 states have internal predecessors, (35621), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:50,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8811 states to 8811 states and 35621 transitions. [2021-05-22 02:14:50,093 INFO L78 Accepts]: Start accepts. Automaton has 8811 states and 35621 transitions. Word has length 28 [2021-05-22 02:14:50,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:50,093 INFO L482 AbstractCegarLoop]: Abstraction has 8811 states and 35621 transitions. [2021-05-22 02:14:50,093 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 02:14:50,093 INFO L276 IsEmpty]: Start isEmpty. Operand 8811 states and 35621 transitions. [2021-05-22 02:14:50,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:50,109 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:50,109 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:50,310 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-22 02:14:50,310 INFO L430 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:50,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:50,310 INFO L82 PathProgramCache]: Analyzing trace with hash -2054099383, now seen corresponding path program 16 times [2021-05-22 02:14:50,311 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:50,311 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845553639] [2021-05-22 02:14:50,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:50,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:50,336 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:14:50,336 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:50,336 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845553639] [2021-05-22 02:14:50,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845553639] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:50,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634408483] [2021-05-22 02:14:50,337 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 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 02:14:50,364 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:14:50,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:50,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:50,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:50,458 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:50,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634408483] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:50,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:50,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:14:50,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700180538] [2021-05-22 02:14:50,459 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:14:50,459 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:50,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:14:50,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:14:50,460 INFO L87 Difference]: Start difference. First operand 8811 states and 35621 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:51,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:51,013 INFO L93 Difference]: Finished difference Result 13573 states and 53112 transitions. [2021-05-22 02:14:51,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-22 02:14:51,013 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:51,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:51,062 INFO L225 Difference]: With dead ends: 13573 [2021-05-22 02:14:51,063 INFO L226 Difference]: Without dead ends: 13573 [2021-05-22 02:14:51,063 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 144.9ms TimeCoverageRelationStatistics Valid=100, Invalid=280, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:14:51,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13573 states. [2021-05-22 02:14:51,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13573 to 8864. [2021-05-22 02:14:51,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8864 states, 8863 states have (on average 4.042423558614464) internal successors, (35828), 8863 states have internal predecessors, (35828), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:51,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8864 states to 8864 states and 35828 transitions. [2021-05-22 02:14:51,324 INFO L78 Accepts]: Start accepts. Automaton has 8864 states and 35828 transitions. Word has length 28 [2021-05-22 02:14:51,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:51,324 INFO L482 AbstractCegarLoop]: Abstraction has 8864 states and 35828 transitions. [2021-05-22 02:14:51,324 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:51,324 INFO L276 IsEmpty]: Start isEmpty. Operand 8864 states and 35828 transitions. [2021-05-22 02:14:51,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:51,341 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:51,341 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:51,541 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-22 02:14:51,542 INFO L430 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:51,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:51,542 INFO L82 PathProgramCache]: Analyzing trace with hash -490719258, now seen corresponding path program 17 times [2021-05-22 02:14:51,542 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:51,542 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103139961] [2021-05-22 02:14:51,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:51,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:51,568 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:14:51,569 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:51,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103139961] [2021-05-22 02:14:51,569 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103139961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:51,569 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2134347720] [2021-05-22 02:14:51,569 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 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 02:14:51,598 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:14:51,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:51,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:51,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:51,683 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:51,683 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2134347720] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:51,683 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:51,683 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:14:51,683 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753936693] [2021-05-22 02:14:51,684 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:14:51,684 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:51,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:14:51,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:14:51,684 INFO L87 Difference]: Start difference. First operand 8864 states and 35828 transitions. Second operand has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:52,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:52,140 INFO L93 Difference]: Finished difference Result 14465 states and 55050 transitions. [2021-05-22 02:14:52,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:14:52,140 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:52,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:52,185 INFO L225 Difference]: With dead ends: 14465 [2021-05-22 02:14:52,185 INFO L226 Difference]: Without dead ends: 14437 [2021-05-22 02:14:52,186 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 155.3ms TimeCoverageRelationStatistics Valid=112, Invalid=350, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:14:52,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14437 states. [2021-05-22 02:14:52,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14437 to 8864. [2021-05-22 02:14:52,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8864 states, 8863 states have (on average 4.0412952724811015) internal successors, (35818), 8863 states have internal predecessors, (35818), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:52,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8864 states to 8864 states and 35818 transitions. [2021-05-22 02:14:52,472 INFO L78 Accepts]: Start accepts. Automaton has 8864 states and 35818 transitions. Word has length 28 [2021-05-22 02:14:52,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:52,473 INFO L482 AbstractCegarLoop]: Abstraction has 8864 states and 35818 transitions. [2021-05-22 02:14:52,473 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.888888888888889) internal successors, (35), 8 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:52,473 INFO L276 IsEmpty]: Start isEmpty. Operand 8864 states and 35818 transitions. [2021-05-22 02:14:52,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:52,491 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:52,491 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:52,692 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-22 02:14:52,692 INFO L430 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:52,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:52,692 INFO L82 PathProgramCache]: Analyzing trace with hash -1217287753, now seen corresponding path program 18 times [2021-05-22 02:14:52,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:52,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1025177552] [2021-05-22 02:14:52,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:52,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:52,725 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:52,726 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:52,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1025177552] [2021-05-22 02:14:52,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1025177552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:52,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241476070] [2021-05-22 02:14:52,726 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 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 02:14:52,759 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:14:52,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:52,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:52,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:52,845 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:52,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241476070] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:52,846 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:52,846 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2021-05-22 02:14:52,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893430358] [2021-05-22 02:14:52,846 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:14:52,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:52,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:14:52,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:14:52,847 INFO L87 Difference]: Start difference. First operand 8864 states and 35818 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:53,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:53,664 INFO L93 Difference]: Finished difference Result 17059 states and 67264 transitions. [2021-05-22 02:14:53,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-22 02:14:53,665 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:53,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:53,718 INFO L225 Difference]: With dead ends: 17059 [2021-05-22 02:14:53,718 INFO L226 Difference]: Without dead ends: 17059 [2021-05-22 02:14:53,718 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 247.4ms TimeCoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2021-05-22 02:14:53,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17059 states. [2021-05-22 02:14:53,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17059 to 8917. [2021-05-22 02:14:53,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8917 states, 8916 states have (on average 4.040489008524002) internal successors, (36025), 8916 states have internal predecessors, (36025), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:54,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8917 states to 8917 states and 36025 transitions. [2021-05-22 02:14:54,005 INFO L78 Accepts]: Start accepts. Automaton has 8917 states and 36025 transitions. Word has length 28 [2021-05-22 02:14:54,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:54,005 INFO L482 AbstractCegarLoop]: Abstraction has 8917 states and 36025 transitions. [2021-05-22 02:14:54,005 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:54,006 INFO L276 IsEmpty]: Start isEmpty. Operand 8917 states and 36025 transitions. [2021-05-22 02:14:54,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:54,023 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:54,023 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:54,223 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:14:54,224 INFO L430 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:54,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:54,224 INFO L82 PathProgramCache]: Analyzing trace with hash -857102546, now seen corresponding path program 19 times [2021-05-22 02:14:54,224 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:54,224 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540718304] [2021-05-22 02:14:54,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:54,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:54,266 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:54,266 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:54,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540718304] [2021-05-22 02:14:54,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1540718304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:54,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832349217] [2021-05-22 02:14:54,267 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 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 02:14:54,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:54,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:54,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:54,403 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:54,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [832349217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:54,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:54,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2021-05-22 02:14:54,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618391040] [2021-05-22 02:14:54,404 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:14:54,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:54,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:14:54,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:14:54,405 INFO L87 Difference]: Start difference. First operand 8917 states and 36025 transitions. Second operand has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:54,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:54,993 INFO L93 Difference]: Finished difference Result 17336 states and 65142 transitions. [2021-05-22 02:14:54,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-22 02:14:54,994 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:54,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:55,042 INFO L225 Difference]: With dead ends: 17336 [2021-05-22 02:14:55,042 INFO L226 Difference]: Without dead ends: 17224 [2021-05-22 02:14:55,042 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 252.3ms TimeCoverageRelationStatistics Valid=211, Invalid=781, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:14:55,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17224 states. [2021-05-22 02:14:55,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17224 to 8917. [2021-05-22 02:14:55,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8917 states, 8916 states have (on average 4.039367429340511) internal successors, (36015), 8916 states have internal predecessors, (36015), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:55,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8917 states to 8917 states and 36015 transitions. [2021-05-22 02:14:55,345 INFO L78 Accepts]: Start accepts. Automaton has 8917 states and 36015 transitions. Word has length 28 [2021-05-22 02:14:55,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:55,345 INFO L482 AbstractCegarLoop]: Abstraction has 8917 states and 36015 transitions. [2021-05-22 02:14:55,345 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.5) internal successors, (35), 9 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:55,345 INFO L276 IsEmpty]: Start isEmpty. Operand 8917 states and 36015 transitions. [2021-05-22 02:14:55,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:55,363 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:55,363 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:55,564 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:14:55,565 INFO L430 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:55,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:55,565 INFO L82 PathProgramCache]: Analyzing trace with hash -1623161651, now seen corresponding path program 20 times [2021-05-22 02:14:55,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:55,565 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238660389] [2021-05-22 02:14:55,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:55,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:55,600 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:55,600 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:55,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238660389] [2021-05-22 02:14:55,600 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238660389] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:55,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [236209057] [2021-05-22 02:14:55,600 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 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 02:14:55,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:14:55,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:55,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:55,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:55,703 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:55,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [236209057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:55,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:55,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-05-22 02:14:55,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393184134] [2021-05-22 02:14:55,704 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:14:55,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:55,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:14:55,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:14:55,705 INFO L87 Difference]: Start difference. First operand 8917 states and 36015 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:14:56,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:56,508 INFO L93 Difference]: Finished difference Result 13676 states and 54158 transitions. [2021-05-22 02:14:56,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-22 02:14:56,508 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 28 [2021-05-22 02:14:56,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:56,550 INFO L225 Difference]: With dead ends: 13676 [2021-05-22 02:14:56,550 INFO L226 Difference]: Without dead ends: 13676 [2021-05-22 02:14:56,551 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 339.2ms TimeCoverageRelationStatistics Valid=267, Invalid=923, Unknown=0, NotChecked=0, Total=1190 [2021-05-22 02:14:56,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13676 states. [2021-05-22 02:14:56,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13676 to 9131. [2021-05-22 02:14:56,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9131 states, 9130 states have (on average 4.022562979189485) internal successors, (36726), 9130 states have internal predecessors, (36726), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:56,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9131 states to 9131 states and 36726 transitions. [2021-05-22 02:14:56,801 INFO L78 Accepts]: Start accepts. Automaton has 9131 states and 36726 transitions. Word has length 28 [2021-05-22 02:14:56,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:56,801 INFO L482 AbstractCegarLoop]: Abstraction has 9131 states and 36726 transitions. [2021-05-22 02:14:56,801 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:14:56,802 INFO L276 IsEmpty]: Start isEmpty. Operand 9131 states and 36726 transitions. [2021-05-22 02:14:56,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:56,819 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:56,819 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:57,020 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-22 02:14:57,020 INFO L430 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:57,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:57,020 INFO L82 PathProgramCache]: Analyzing trace with hash -331624474, now seen corresponding path program 21 times [2021-05-22 02:14:57,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:57,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477076540] [2021-05-22 02:14:57,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:57,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:57,057 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:57,058 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:57,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477076540] [2021-05-22 02:14:57,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1477076540] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:57,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100849237] [2021-05-22 02:14:57,058 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 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 02:14:57,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:14:57,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:57,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:57,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:57,163 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:57,164 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100849237] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:57,164 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:57,164 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-05-22 02:14:57,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955855577] [2021-05-22 02:14:57,164 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:14:57,164 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:57,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:14:57,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:14:57,165 INFO L87 Difference]: Start difference. First operand 9131 states and 36726 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:14:57,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:57,757 INFO L93 Difference]: Finished difference Result 15155 states and 56901 transitions. [2021-05-22 02:14:57,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-22 02:14:57,757 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 28 [2021-05-22 02:14:57,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:57,799 INFO L225 Difference]: With dead ends: 15155 [2021-05-22 02:14:57,799 INFO L226 Difference]: Without dead ends: 15043 [2021-05-22 02:14:57,799 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 271.5ms TimeCoverageRelationStatistics Valid=198, Invalid=732, Unknown=0, NotChecked=0, Total=930 [2021-05-22 02:14:57,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15043 states. [2021-05-22 02:14:58,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15043 to 9347. [2021-05-22 02:14:58,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9347 states, 9346 states have (on average 4.008238818745988) internal successors, (37461), 9346 states have internal predecessors, (37461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:58,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9347 states to 9347 states and 37461 transitions. [2021-05-22 02:14:58,081 INFO L78 Accepts]: Start accepts. Automaton has 9347 states and 37461 transitions. Word has length 28 [2021-05-22 02:14:58,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:58,082 INFO L482 AbstractCegarLoop]: Abstraction has 9347 states and 37461 transitions. [2021-05-22 02:14:58,082 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:14:58,082 INFO L276 IsEmpty]: Start isEmpty. Operand 9347 states and 37461 transitions. [2021-05-22 02:14:58,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:58,099 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:58,099 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:58,299 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:14:58,300 INFO L430 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:58,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:58,300 INFO L82 PathProgramCache]: Analyzing trace with hash 1738838736, now seen corresponding path program 22 times [2021-05-22 02:14:58,300 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:58,300 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357640221] [2021-05-22 02:14:58,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:58,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:58,337 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:58,337 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:58,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357640221] [2021-05-22 02:14:58,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357640221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:58,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1413575308] [2021-05-22 02:14:58,338 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 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 02:14:58,364 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:14:58,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:58,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:58,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:58,478 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:58,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1413575308] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:58,479 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:58,479 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-05-22 02:14:58,479 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064612010] [2021-05-22 02:14:58,479 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:14:58,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:58,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:14:58,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:14:58,480 INFO L87 Difference]: Start difference. First operand 9347 states and 37461 transitions. Second operand has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 10 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:59,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:14:59,209 INFO L93 Difference]: Finished difference Result 16354 states and 63144 transitions. [2021-05-22 02:14:59,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-22 02:14:59,210 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 10 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:14:59,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:14:59,254 INFO L225 Difference]: With dead ends: 16354 [2021-05-22 02:14:59,255 INFO L226 Difference]: Without dead ends: 16354 [2021-05-22 02:14:59,255 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 251.1ms TimeCoverageRelationStatistics Valid=215, Invalid=777, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:14:59,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16354 states. [2021-05-22 02:14:59,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16354 to 9241. [2021-05-22 02:14:59,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9241 states, 9240 states have (on average 3.997943722943723) internal successors, (36941), 9240 states have internal predecessors, (36941), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:59,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9241 states to 9241 states and 36941 transitions. [2021-05-22 02:14:59,521 INFO L78 Accepts]: Start accepts. Automaton has 9241 states and 36941 transitions. Word has length 28 [2021-05-22 02:14:59,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:14:59,521 INFO L482 AbstractCegarLoop]: Abstraction has 9241 states and 36941 transitions. [2021-05-22 02:14:59,521 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 10 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:14:59,521 INFO L276 IsEmpty]: Start isEmpty. Operand 9241 states and 36941 transitions. [2021-05-22 02:14:59,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:14:59,536 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:14:59,536 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:14:59,737 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-22 02:14:59,737 INFO L430 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:14:59,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:14:59,737 INFO L82 PathProgramCache]: Analyzing trace with hash 1444912965, now seen corresponding path program 23 times [2021-05-22 02:14:59,737 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:14:59,737 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1892890241] [2021-05-22 02:14:59,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:14:59,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:14:59,774 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:59,774 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:14:59,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1892890241] [2021-05-22 02:14:59,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1892890241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:59,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473936145] [2021-05-22 02:14:59,774 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 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 02:14:59,799 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:14:59,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:14:59,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:14:59,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:14:59,887 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:14:59,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473936145] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:14:59,887 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:14:59,887 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-05-22 02:14:59,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729034616] [2021-05-22 02:14:59,887 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:14:59,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:14:59,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:14:59,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:14:59,888 INFO L87 Difference]: Start difference. First operand 9241 states and 36941 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:00,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:00,322 INFO L93 Difference]: Finished difference Result 12762 states and 48779 transitions. [2021-05-22 02:15:00,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:15:00,322 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:15:00,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:00,351 INFO L225 Difference]: With dead ends: 12762 [2021-05-22 02:15:00,351 INFO L226 Difference]: Without dead ends: 12722 [2021-05-22 02:15:00,352 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 161.0ms TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:15:00,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12722 states. [2021-05-22 02:15:00,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12722 to 8983. [2021-05-22 02:15:00,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8983 states, 8982 states have (on average 4.0035626809173905) internal successors, (35960), 8982 states have internal predecessors, (35960), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:00,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8983 states to 8983 states and 35960 transitions. [2021-05-22 02:15:00,536 INFO L78 Accepts]: Start accepts. Automaton has 8983 states and 35960 transitions. Word has length 28 [2021-05-22 02:15:00,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:00,536 INFO L482 AbstractCegarLoop]: Abstraction has 8983 states and 35960 transitions. [2021-05-22 02:15:00,536 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:00,536 INFO L276 IsEmpty]: Start isEmpty. Operand 8983 states and 35960 transitions. [2021-05-22 02:15:00,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:00,551 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:00,551 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:00,751 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-22 02:15:00,752 INFO L430 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:00,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:00,752 INFO L82 PathProgramCache]: Analyzing trace with hash -1089598035, now seen corresponding path program 4 times [2021-05-22 02:15:00,752 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:00,752 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858018106] [2021-05-22 02:15:00,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:00,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:00,790 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:00,790 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:00,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858018106] [2021-05-22 02:15:00,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858018106] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:00,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706504340] [2021-05-22 02:15:00,791 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 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 02:15:00,825 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:15:00,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:00,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:00,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:00,902 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:00,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1706504340] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:00,903 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:00,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-05-22 02:15:00,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954467011] [2021-05-22 02:15:00,903 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:15:00,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:00,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:15:00,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:15:00,904 INFO L87 Difference]: Start difference. First operand 8983 states and 35960 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:15:01,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:01,825 INFO L93 Difference]: Finished difference Result 30234 states and 120265 transitions. [2021-05-22 02:15:01,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-22 02:15:01,826 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 28 [2021-05-22 02:15:01,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:01,911 INFO L225 Difference]: With dead ends: 30234 [2021-05-22 02:15:01,911 INFO L226 Difference]: Without dead ends: 30234 [2021-05-22 02:15:01,911 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 320.0ms TimeCoverageRelationStatistics Valid=267, Invalid=923, Unknown=0, NotChecked=0, Total=1190 [2021-05-22 02:15:01,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30234 states. [2021-05-22 02:15:02,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30234 to 14412. [2021-05-22 02:15:02,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14412 states, 14411 states have (on average 4.099715495107904) internal successors, (59081), 14411 states have internal predecessors, (59081), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:02,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14412 states to 14412 states and 59081 transitions. [2021-05-22 02:15:02,337 INFO L78 Accepts]: Start accepts. Automaton has 14412 states and 59081 transitions. Word has length 28 [2021-05-22 02:15:02,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:02,337 INFO L482 AbstractCegarLoop]: Abstraction has 14412 states and 59081 transitions. [2021-05-22 02:15:02,337 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:15:02,337 INFO L276 IsEmpty]: Start isEmpty. Operand 14412 states and 59081 transitions. [2021-05-22 02:15:02,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:02,364 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:02,364 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:02,564 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-22 02:15:02,565 INFO L430 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:02,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:02,565 INFO L82 PathProgramCache]: Analyzing trace with hash 473096940, now seen corresponding path program 5 times [2021-05-22 02:15:02,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:02,565 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662115678] [2021-05-22 02:15:02,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:02,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:02,605 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:02,605 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:02,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662115678] [2021-05-22 02:15:02,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662115678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:02,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1130800553] [2021-05-22 02:15:02,605 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 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 02:15:02,630 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:15:02,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:02,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:02,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:02,695 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:02,695 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1130800553] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:02,695 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:02,695 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-05-22 02:15:02,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919655808] [2021-05-22 02:15:02,695 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:15:02,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:02,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:15:02,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:15:02,696 INFO L87 Difference]: Start difference. First operand 14412 states and 59081 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:15:03,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:03,421 INFO L93 Difference]: Finished difference Result 40819 states and 161536 transitions. [2021-05-22 02:15:03,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-22 02:15:03,422 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 28 [2021-05-22 02:15:03,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:03,561 INFO L225 Difference]: With dead ends: 40819 [2021-05-22 02:15:03,562 INFO L226 Difference]: Without dead ends: 40578 [2021-05-22 02:15:03,562 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 250.9ms TimeCoverageRelationStatistics Valid=229, Invalid=827, Unknown=0, NotChecked=0, Total=1056 [2021-05-22 02:15:03,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40578 states. [2021-05-22 02:15:04,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40578 to 24036. [2021-05-22 02:15:04,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24036 states, 24035 states have (on average 4.249511129602663) internal successors, (102137), 24035 states have internal predecessors, (102137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:04,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24036 states to 24036 states and 102137 transitions. [2021-05-22 02:15:04,237 INFO L78 Accepts]: Start accepts. Automaton has 24036 states and 102137 transitions. Word has length 28 [2021-05-22 02:15:04,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:04,237 INFO L482 AbstractCegarLoop]: Abstraction has 24036 states and 102137 transitions. [2021-05-22 02:15:04,237 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:15:04,237 INFO L276 IsEmpty]: Start isEmpty. Operand 24036 states and 102137 transitions. [2021-05-22 02:15:04,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:04,287 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:04,287 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:04,488 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-22 02:15:04,488 INFO L430 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:04,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:04,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1472081004, now seen corresponding path program 6 times [2021-05-22 02:15:04,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:04,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403136983] [2021-05-22 02:15:04,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:04,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:04,512 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:04,512 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:04,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403136983] [2021-05-22 02:15:04,512 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1403136983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:04,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1155911362] [2021-05-22 02:15:04,513 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 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 02:15:04,557 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:15:04,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:04,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:04,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:04,629 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:04,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1155911362] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:04,629 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:04,630 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:15:04,630 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779640607] [2021-05-22 02:15:04,630 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:15:04,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:04,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:15:04,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:15:04,631 INFO L87 Difference]: Start difference. First operand 24036 states and 102137 transitions. Second operand has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 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 02:15:05,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:05,166 INFO L93 Difference]: Finished difference Result 42953 states and 171667 transitions. [2021-05-22 02:15:05,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:15:05,166 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 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 28 [2021-05-22 02:15:05,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:05,299 INFO L225 Difference]: With dead ends: 42953 [2021-05-22 02:15:05,299 INFO L226 Difference]: Without dead ends: 42953 [2021-05-22 02:15:05,300 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 141.4ms TimeCoverageRelationStatistics Valid=112, Invalid=350, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:15:05,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42953 states. [2021-05-22 02:15:05,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42953 to 24036. [2021-05-22 02:15:05,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24036 states, 24035 states have (on average 4.228292074058665) internal successors, (101627), 24035 states have internal predecessors, (101627), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:06,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24036 states to 24036 states and 101627 transitions. [2021-05-22 02:15:06,019 INFO L78 Accepts]: Start accepts. Automaton has 24036 states and 101627 transitions. Word has length 28 [2021-05-22 02:15:06,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:06,019 INFO L482 AbstractCegarLoop]: Abstraction has 24036 states and 101627 transitions. [2021-05-22 02:15:06,019 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 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 02:15:06,019 INFO L276 IsEmpty]: Start isEmpty. Operand 24036 states and 101627 transitions. [2021-05-22 02:15:06,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:06,069 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:06,069 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:06,272 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-22 02:15:06,273 INFO L430 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:06,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:06,273 INFO L82 PathProgramCache]: Analyzing trace with hash 1500245315, now seen corresponding path program 7 times [2021-05-22 02:15:06,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:06,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087911082] [2021-05-22 02:15:06,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:06,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:06,299 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:06,300 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:06,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087911082] [2021-05-22 02:15:06,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2087911082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:06,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205421056] [2021-05-22 02:15:06,300 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 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 02:15:06,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:06,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:06,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:06,405 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:06,406 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205421056] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:06,406 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:06,406 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:15:06,406 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156880142] [2021-05-22 02:15:06,406 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:15:06,406 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:06,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:15:06,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:15:06,407 INFO L87 Difference]: Start difference. First operand 24036 states and 101627 transitions. Second operand has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 02:15:06,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:06,817 INFO L93 Difference]: Finished difference Result 29179 states and 119232 transitions. [2021-05-22 02:15:06,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:15:06,817 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 28 [2021-05-22 02:15:06,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:06,900 INFO L225 Difference]: With dead ends: 29179 [2021-05-22 02:15:06,901 INFO L226 Difference]: Without dead ends: 29131 [2021-05-22 02:15:06,901 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 96.5ms TimeCoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:15:06,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29131 states. [2021-05-22 02:15:07,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29131 to 24202. [2021-05-22 02:15:07,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24202 states, 24201 states have (on average 4.223296557993471) internal successors, (102208), 24201 states have internal predecessors, (102208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:07,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24202 states to 24202 states and 102208 transitions. [2021-05-22 02:15:07,484 INFO L78 Accepts]: Start accepts. Automaton has 24202 states and 102208 transitions. Word has length 28 [2021-05-22 02:15:07,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:07,484 INFO L482 AbstractCegarLoop]: Abstraction has 24202 states and 102208 transitions. [2021-05-22 02:15:07,484 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 02:15:07,484 INFO L276 IsEmpty]: Start isEmpty. Operand 24202 states and 102208 transitions. [2021-05-22 02:15:07,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:07,539 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:07,539 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:07,739 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:15:07,740 INFO L430 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:07,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:07,740 INFO L82 PathProgramCache]: Analyzing trace with hash 1268278573, now seen corresponding path program 8 times [2021-05-22 02:15:07,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:07,740 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038177469] [2021-05-22 02:15:07,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:07,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:07,761 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:15:07,761 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:07,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038177469] [2021-05-22 02:15:07,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1038177469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:07,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987184978] [2021-05-22 02:15:07,762 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 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 02:15:07,787 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:15:07,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:07,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:07,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:07,868 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:07,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987184978] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:07,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:07,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 9 [2021-05-22 02:15:07,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327699756] [2021-05-22 02:15:07,869 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:15:07,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:07,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:15:07,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:15:07,870 INFO L87 Difference]: Start difference. First operand 24202 states and 102208 transitions. Second operand has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 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 02:15:08,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:08,541 INFO L93 Difference]: Finished difference Result 49310 states and 196485 transitions. [2021-05-22 02:15:08,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-22 02:15:08,542 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 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 28 [2021-05-22 02:15:08,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:08,701 INFO L225 Difference]: With dead ends: 49310 [2021-05-22 02:15:08,701 INFO L226 Difference]: Without dead ends: 49310 [2021-05-22 02:15:08,702 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 146.1ms TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:15:08,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49310 states. [2021-05-22 02:15:09,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49310 to 24542. [2021-05-22 02:15:09,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24542 states, 24541 states have (on average 4.213683223992502) internal successors, (103408), 24541 states have internal predecessors, (103408), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:09,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24542 states to 24542 states and 103408 transitions. [2021-05-22 02:15:09,706 INFO L78 Accepts]: Start accepts. Automaton has 24542 states and 103408 transitions. Word has length 28 [2021-05-22 02:15:09,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:09,706 INFO L482 AbstractCegarLoop]: Abstraction has 24542 states and 103408 transitions. [2021-05-22 02:15:09,706 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.7) internal successors, (37), 9 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 02:15:09,706 INFO L276 IsEmpty]: Start isEmpty. Operand 24542 states and 103408 transitions. [2021-05-22 02:15:09,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:09,755 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:09,755 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:09,955 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-22 02:15:09,956 INFO L430 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:09,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:09,956 INFO L82 PathProgramCache]: Analyzing trace with hash 559591502, now seen corresponding path program 9 times [2021-05-22 02:15:09,956 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:09,956 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980816357] [2021-05-22 02:15:09,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:09,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:09,983 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:15:09,983 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:09,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980816357] [2021-05-22 02:15:09,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980816357] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:09,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034912967] [2021-05-22 02:15:09,984 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 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 02:15:10,010 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:15:10,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:10,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:10,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:10,089 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:10,089 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034912967] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:10,090 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:10,090 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 9 [2021-05-22 02:15:10,090 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957157864] [2021-05-22 02:15:10,090 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:15:10,090 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:10,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:15:10,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:15:10,090 INFO L87 Difference]: Start difference. First operand 24542 states and 103408 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:10,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:10,740 INFO L93 Difference]: Finished difference Result 43190 states and 171488 transitions. [2021-05-22 02:15:10,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-22 02:15:10,740 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:15:10,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:10,853 INFO L225 Difference]: With dead ends: 43190 [2021-05-22 02:15:10,854 INFO L226 Difference]: Without dead ends: 43115 [2021-05-22 02:15:10,854 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 150.8ms TimeCoverageRelationStatistics Valid=144, Invalid=456, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:15:10,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43115 states. [2021-05-22 02:15:11,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43115 to 24542. [2021-05-22 02:15:11,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24542 states, 24541 states have (on average 4.212705268733956) internal successors, (103384), 24541 states have internal predecessors, (103384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:11,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24542 states to 24542 states and 103384 transitions. [2021-05-22 02:15:11,934 INFO L78 Accepts]: Start accepts. Automaton has 24542 states and 103384 transitions. Word has length 28 [2021-05-22 02:15:11,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:11,934 INFO L482 AbstractCegarLoop]: Abstraction has 24542 states and 103384 transitions. [2021-05-22 02:15:11,934 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:11,934 INFO L276 IsEmpty]: Start isEmpty. Operand 24542 states and 103384 transitions. [2021-05-22 02:15:11,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:11,993 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:11,993 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:12,195 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-22 02:15:12,195 INFO L430 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:12,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:12,195 INFO L82 PathProgramCache]: Analyzing trace with hash -402212590, now seen corresponding path program 10 times [2021-05-22 02:15:12,196 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:12,196 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204443602] [2021-05-22 02:15:12,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:12,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:12,232 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:12,232 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:12,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204443602] [2021-05-22 02:15:12,237 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1204443602] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:12,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34607829] [2021-05-22 02:15:12,237 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 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 02:15:12,260 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:15:12,261 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:12,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:12,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:12,334 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:12,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [34607829] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:12,334 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:12,334 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 9 [2021-05-22 02:15:12,334 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890340929] [2021-05-22 02:15:12,334 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:15:12,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:12,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:15:12,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:15:12,335 INFO L87 Difference]: Start difference. First operand 24542 states and 103384 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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 02:15:13,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:13,280 INFO L93 Difference]: Finished difference Result 51588 states and 205543 transitions. [2021-05-22 02:15:13,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-22 02:15:13,281 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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 28 [2021-05-22 02:15:13,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:13,459 INFO L225 Difference]: With dead ends: 51588 [2021-05-22 02:15:13,459 INFO L226 Difference]: Without dead ends: 51588 [2021-05-22 02:15:13,460 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 185.7ms TimeCoverageRelationStatistics Valid=184, Invalid=572, Unknown=0, NotChecked=0, Total=756 [2021-05-22 02:15:13,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51588 states. [2021-05-22 02:15:14,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51588 to 24882. [2021-05-22 02:15:14,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24882 states, 24881 states have (on average 4.210200554640087) internal successors, (104754), 24881 states have internal predecessors, (104754), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:14,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24882 states to 24882 states and 104754 transitions. [2021-05-22 02:15:14,564 INFO L78 Accepts]: Start accepts. Automaton has 24882 states and 104754 transitions. Word has length 28 [2021-05-22 02:15:14,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:14,564 INFO L482 AbstractCegarLoop]: Abstraction has 24882 states and 104754 transitions. [2021-05-22 02:15:14,564 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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 02:15:14,564 INFO L276 IsEmpty]: Start isEmpty. Operand 24882 states and 104754 transitions. [2021-05-22 02:15:14,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:14,619 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:14,619 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:14,822 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:15:14,822 INFO L430 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:14,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:14,822 INFO L82 PathProgramCache]: Analyzing trace with hash -374048279, now seen corresponding path program 11 times [2021-05-22 02:15:14,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:14,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154441555] [2021-05-22 02:15:14,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:14,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:14,847 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:14,847 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:14,848 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154441555] [2021-05-22 02:15:14,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154441555] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:14,848 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894240538] [2021-05-22 02:15:14,848 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 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 02:15:14,873 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:15:14,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:14,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:14,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:14,968 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:14,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894240538] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:14,968 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:14,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 9 [2021-05-22 02:15:14,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318786548] [2021-05-22 02:15:14,969 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:15:14,969 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:14,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:15:14,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:15:14,969 INFO L87 Difference]: Start difference. First operand 24882 states and 104754 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:15,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:15,736 INFO L93 Difference]: Finished difference Result 39744 states and 158044 transitions. [2021-05-22 02:15:15,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:15:15,736 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:15:15,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:15,863 INFO L225 Difference]: With dead ends: 39744 [2021-05-22 02:15:15,863 INFO L226 Difference]: Without dead ends: 39696 [2021-05-22 02:15:15,863 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 160.7ms TimeCoverageRelationStatistics Valid=115, Invalid=391, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:15:15,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39696 states. [2021-05-22 02:15:16,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39696 to 24882. [2021-05-22 02:15:16,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24882 states, 24881 states have (on average 4.209235963184759) internal successors, (104730), 24881 states have internal predecessors, (104730), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:16,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24882 states to 24882 states and 104730 transitions. [2021-05-22 02:15:16,627 INFO L78 Accepts]: Start accepts. Automaton has 24882 states and 104730 transitions. Word has length 28 [2021-05-22 02:15:16,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:16,627 INFO L482 AbstractCegarLoop]: Abstraction has 24882 states and 104730 transitions. [2021-05-22 02:15:16,627 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 9 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:16,627 INFO L276 IsEmpty]: Start isEmpty. Operand 24882 states and 104730 transitions. [2021-05-22 02:15:16,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:16,888 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:16,888 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:17,089 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-22 02:15:17,089 INFO L430 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:17,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:17,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1874668720, now seen corresponding path program 12 times [2021-05-22 02:15:17,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:17,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240444186] [2021-05-22 02:15:17,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:17,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:17,123 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:17,123 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:17,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240444186] [2021-05-22 02:15:17,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240444186] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:17,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759419178] [2021-05-22 02:15:17,123 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 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 02:15:17,148 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:15:17,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:17,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:17,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:17,228 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:17,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759419178] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:17,228 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:17,228 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-05-22 02:15:17,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764516723] [2021-05-22 02:15:17,229 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:15:17,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:17,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:15:17,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:15:17,229 INFO L87 Difference]: Start difference. First operand 24882 states and 104730 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 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 02:15:18,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:18,267 INFO L93 Difference]: Finished difference Result 51567 states and 205376 transitions. [2021-05-22 02:15:18,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-22 02:15:18,267 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 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 28 [2021-05-22 02:15:18,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:18,459 INFO L225 Difference]: With dead ends: 51567 [2021-05-22 02:15:18,459 INFO L226 Difference]: Without dead ends: 51567 [2021-05-22 02:15:18,459 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 247.2ms TimeCoverageRelationStatistics Valid=215, Invalid=777, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:15:18,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51567 states. [2021-05-22 02:15:19,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51567 to 25308. [2021-05-22 02:15:19,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25308 states, 25307 states have (on average 4.182123523135891) internal successors, (105837), 25307 states have internal predecessors, (105837), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:19,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25308 states to 25308 states and 105837 transitions. [2021-05-22 02:15:19,631 INFO L78 Accepts]: Start accepts. Automaton has 25308 states and 105837 transitions. Word has length 28 [2021-05-22 02:15:19,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:19,631 INFO L482 AbstractCegarLoop]: Abstraction has 25308 states and 105837 transitions. [2021-05-22 02:15:19,631 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 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 02:15:19,631 INFO L276 IsEmpty]: Start isEmpty. Operand 25308 states and 105837 transitions. [2021-05-22 02:15:19,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:19,688 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:19,689 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:19,890 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:15:19,890 INFO L430 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:19,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:19,890 INFO L82 PathProgramCache]: Analyzing trace with hash -652745811, now seen corresponding path program 13 times [2021-05-22 02:15:19,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:19,891 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728804595] [2021-05-22 02:15:19,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:19,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:19,939 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:19,940 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:19,940 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728804595] [2021-05-22 02:15:19,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728804595] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:19,940 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210251187] [2021-05-22 02:15:19,940 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 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 02:15:19,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:19,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:19,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:20,072 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:20,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210251187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:20,072 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:20,072 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-05-22 02:15:20,072 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336041682] [2021-05-22 02:15:20,072 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:15:20,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:20,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:15:20,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:15:20,073 INFO L87 Difference]: Start difference. First operand 25308 states and 105837 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:20,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:20,885 INFO L93 Difference]: Finished difference Result 35545 states and 141251 transitions. [2021-05-22 02:15:20,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:15:20,885 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:15:20,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:21,001 INFO L225 Difference]: With dead ends: 35545 [2021-05-22 02:15:21,001 INFO L226 Difference]: Without dead ends: 35497 [2021-05-22 02:15:21,002 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 186.6ms TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:15:21,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35497 states. [2021-05-22 02:15:21,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35497 to 25624. [2021-05-22 02:15:21,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25624 states, 25623 states have (on average 4.173633064044023) internal successors, (106941), 25623 states have internal predecessors, (106941), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:21,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25624 states to 25624 states and 106941 transitions. [2021-05-22 02:15:21,873 INFO L78 Accepts]: Start accepts. Automaton has 25624 states and 106941 transitions. Word has length 28 [2021-05-22 02:15:21,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:21,873 INFO L482 AbstractCegarLoop]: Abstraction has 25624 states and 106941 transitions. [2021-05-22 02:15:21,873 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:21,873 INFO L276 IsEmpty]: Start isEmpty. Operand 25624 states and 106941 transitions. [2021-05-22 02:15:21,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:21,936 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:21,936 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:22,140 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-05-22 02:15:22,141 INFO L430 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:22,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:22,141 INFO L82 PathProgramCache]: Analyzing trace with hash -229548541, now seen corresponding path program 14 times [2021-05-22 02:15:22,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:22,144 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418554767] [2021-05-22 02:15:22,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:22,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:22,180 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:15:22,181 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:22,181 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418554767] [2021-05-22 02:15:22,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [418554767] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:22,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60721240] [2021-05-22 02:15:22,182 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 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 02:15:22,217 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:15:22,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:22,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:22,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:22,312 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:22,312 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60721240] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:22,313 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:22,313 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:15:22,313 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968751890] [2021-05-22 02:15:22,313 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:15:22,313 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:22,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:15:22,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:15:22,314 INFO L87 Difference]: Start difference. First operand 25624 states and 106941 transitions. Second operand has 9 states, 9 states have (on average 4.0) internal successors, (36), 8 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:23,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:23,224 INFO L93 Difference]: Finished difference Result 46151 states and 182270 transitions. [2021-05-22 02:15:23,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-22 02:15:23,224 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.0) internal successors, (36), 8 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:15:23,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:23,370 INFO L225 Difference]: With dead ends: 46151 [2021-05-22 02:15:23,370 INFO L226 Difference]: Without dead ends: 46151 [2021-05-22 02:15:23,370 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 159.1ms TimeCoverageRelationStatistics Valid=95, Invalid=325, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:15:23,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46151 states. [2021-05-22 02:15:24,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46151 to 25624. [2021-05-22 02:15:24,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25624 states, 25623 states have (on average 4.166998399875112) internal successors, (106771), 25623 states have internal predecessors, (106771), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:24,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25624 states to 25624 states and 106771 transitions. [2021-05-22 02:15:24,337 INFO L78 Accepts]: Start accepts. Automaton has 25624 states and 106771 transitions. Word has length 28 [2021-05-22 02:15:24,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:24,337 INFO L482 AbstractCegarLoop]: Abstraction has 25624 states and 106771 transitions. [2021-05-22 02:15:24,338 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.0) internal successors, (36), 8 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:24,338 INFO L276 IsEmpty]: Start isEmpty. Operand 25624 states and 106771 transitions. [2021-05-22 02:15:24,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:24,399 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:24,399 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:24,599 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-22 02:15:24,599 INFO L430 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:24,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:24,600 INFO L82 PathProgramCache]: Analyzing trace with hash -938235612, now seen corresponding path program 15 times [2021-05-22 02:15:24,600 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:24,600 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728554175] [2021-05-22 02:15:24,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:24,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:24,624 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:15:24,625 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:24,625 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728554175] [2021-05-22 02:15:24,625 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728554175] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:24,625 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [328346879] [2021-05-22 02:15:24,625 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 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 02:15:24,652 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:15:24,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:24,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:24,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:24,744 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:24,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [328346879] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:24,744 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:24,744 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:15:24,744 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668068408] [2021-05-22 02:15:24,745 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:15:24,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:24,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:15:24,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:15:24,745 INFO L87 Difference]: Start difference. First operand 25624 states and 106771 transitions. Second operand has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 02:15:25,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:25,439 INFO L93 Difference]: Finished difference Result 32707 states and 131617 transitions. [2021-05-22 02:15:25,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:15:25,440 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 28 [2021-05-22 02:15:25,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:25,533 INFO L225 Difference]: With dead ends: 32707 [2021-05-22 02:15:25,534 INFO L226 Difference]: Without dead ends: 32682 [2021-05-22 02:15:25,534 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 104.2ms TimeCoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:15:25,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32682 states. [2021-05-22 02:15:26,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32682 to 25624. [2021-05-22 02:15:26,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25624 states, 25623 states have (on average 4.166530070639659) internal successors, (106759), 25623 states have internal predecessors, (106759), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:26,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25624 states to 25624 states and 106759 transitions. [2021-05-22 02:15:26,414 INFO L78 Accepts]: Start accepts. Automaton has 25624 states and 106759 transitions. Word has length 28 [2021-05-22 02:15:26,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:26,414 INFO L482 AbstractCegarLoop]: Abstraction has 25624 states and 106759 transitions. [2021-05-22 02:15:26,414 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 02:15:26,414 INFO L276 IsEmpty]: Start isEmpty. Operand 25624 states and 106759 transitions. [2021-05-22 02:15:26,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:26,478 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:26,478 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:26,679 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-22 02:15:26,679 INFO L430 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:26,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:26,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1900039704, now seen corresponding path program 16 times [2021-05-22 02:15:26,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:26,679 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573614271] [2021-05-22 02:15:26,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:26,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:26,705 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:15:26,705 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:26,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573614271] [2021-05-22 02:15:26,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [573614271] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:26,705 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1776233661] [2021-05-22 02:15:26,705 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 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 02:15:26,738 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:15:26,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:26,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:26,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:26,825 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:26,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1776233661] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:26,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:26,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:15:26,825 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263583483] [2021-05-22 02:15:26,825 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:15:26,825 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:26,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:15:26,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:15:26,826 INFO L87 Difference]: Start difference. First operand 25624 states and 106759 transitions. Second operand has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 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 02:15:27,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:27,453 INFO L93 Difference]: Finished difference Result 38112 states and 153561 transitions. [2021-05-22 02:15:27,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-22 02:15:27,454 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 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 28 [2021-05-22 02:15:27,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:27,886 INFO L225 Difference]: With dead ends: 38112 [2021-05-22 02:15:27,886 INFO L226 Difference]: Without dead ends: 38112 [2021-05-22 02:15:27,887 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 153.2ms TimeCoverageRelationStatistics Valid=100, Invalid=280, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:15:27,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38112 states. [2021-05-22 02:15:28,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38112 to 25794. [2021-05-22 02:15:28,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25794 states, 25793 states have (on average 4.1656263327259335) internal successors, (107444), 25793 states have internal predecessors, (107444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:28,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25794 states to 25794 states and 107444 transitions. [2021-05-22 02:15:28,561 INFO L78 Accepts]: Start accepts. Automaton has 25794 states and 107444 transitions. Word has length 28 [2021-05-22 02:15:28,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:28,561 INFO L482 AbstractCegarLoop]: Abstraction has 25794 states and 107444 transitions. [2021-05-22 02:15:28,561 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 8 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 02:15:28,561 INFO L276 IsEmpty]: Start isEmpty. Operand 25794 states and 107444 transitions. [2021-05-22 02:15:28,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:28,623 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:28,623 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:28,827 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-22 02:15:28,827 INFO L430 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:28,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:28,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1871875393, now seen corresponding path program 17 times [2021-05-22 02:15:28,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:28,828 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116686922] [2021-05-22 02:15:28,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:28,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:28,851 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:15:28,851 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:28,851 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116686922] [2021-05-22 02:15:28,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1116686922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:28,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114297300] [2021-05-22 02:15:28,852 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-05-22 02:15:29,148 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:15:29,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:29,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:29,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:15:29,223 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:29,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [114297300] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:29,223 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:29,223 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 8 [2021-05-22 02:15:29,223 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690982705] [2021-05-22 02:15:29,223 INFO L462 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-22 02:15:29,224 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:29,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-22 02:15:29,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-22 02:15:29,224 INFO L87 Difference]: Start difference. First operand 25794 states and 107444 transitions. Second operand has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 02:15:29,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:29,770 INFO L93 Difference]: Finished difference Result 39804 states and 156168 transitions. [2021-05-22 02:15:29,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:15:29,770 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 28 [2021-05-22 02:15:29,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:29,896 INFO L225 Difference]: With dead ends: 39804 [2021-05-22 02:15:29,896 INFO L226 Difference]: Without dead ends: 39780 [2021-05-22 02:15:29,897 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 143.9ms TimeCoverageRelationStatistics Valid=112, Invalid=350, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:15:29,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39780 states. [2021-05-22 02:15:30,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39780 to 25794. [2021-05-22 02:15:30,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25794 states, 25793 states have (on average 4.165161090218276) internal successors, (107432), 25793 states have internal predecessors, (107432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:30,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25794 states to 25794 states and 107432 transitions. [2021-05-22 02:15:30,841 INFO L78 Accepts]: Start accepts. Automaton has 25794 states and 107432 transitions. Word has length 28 [2021-05-22 02:15:30,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:30,841 INFO L482 AbstractCegarLoop]: Abstraction has 25794 states and 107432 transitions. [2021-05-22 02:15:30,842 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.6666666666666665) internal successors, (33), 8 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 02:15:30,842 INFO L276 IsEmpty]: Start isEmpty. Operand 25794 states and 107432 transitions. [2021-05-22 02:15:30,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:30,905 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:30,905 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:31,106 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:15:31,106 INFO L430 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:31,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:31,107 INFO L82 PathProgramCache]: Analyzing trace with hash 376841606, now seen corresponding path program 18 times [2021-05-22 02:15:31,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:31,107 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1822883217] [2021-05-22 02:15:31,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:31,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:31,133 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:31,134 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:31,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1822883217] [2021-05-22 02:15:31,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1822883217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:31,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [71836030] [2021-05-22 02:15:31,135 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 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 02:15:31,171 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:15:31,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:31,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:31,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:31,250 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:31,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [71836030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:31,250 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:31,250 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2021-05-22 02:15:31,250 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458320308] [2021-05-22 02:15:31,250 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:15:31,250 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:31,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:15:31,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:15:31,251 INFO L87 Difference]: Start difference. First operand 25794 states and 107432 transitions. Second operand has 10 states, 10 states have (on average 3.2) internal successors, (32), 9 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 02:15:32,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:32,534 INFO L93 Difference]: Finished difference Result 48289 states and 195910 transitions. [2021-05-22 02:15:32,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-22 02:15:32,534 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 9 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 28 [2021-05-22 02:15:32,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:32,701 INFO L225 Difference]: With dead ends: 48289 [2021-05-22 02:15:32,701 INFO L226 Difference]: Without dead ends: 48289 [2021-05-22 02:15:32,701 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 264.0ms TimeCoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2021-05-22 02:15:32,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48289 states. [2021-05-22 02:15:33,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48289 to 25964. [2021-05-22 02:15:33,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25964 states, 25963 states have (on average 4.164272233563148) internal successors, (108117), 25963 states have internal predecessors, (108117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:33,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25964 states to 25964 states and 108117 transitions. [2021-05-22 02:15:33,788 INFO L78 Accepts]: Start accepts. Automaton has 25964 states and 108117 transitions. Word has length 28 [2021-05-22 02:15:33,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:33,788 INFO L482 AbstractCegarLoop]: Abstraction has 25964 states and 108117 transitions. [2021-05-22 02:15:33,788 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.2) internal successors, (32), 9 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 02:15:33,788 INFO L276 IsEmpty]: Start isEmpty. Operand 25964 states and 108117 transitions. [2021-05-22 02:15:33,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:33,848 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:33,848 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:34,048 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-22 02:15:34,049 INFO L430 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:34,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:34,049 INFO L82 PathProgramCache]: Analyzing trace with hash 2144394371, now seen corresponding path program 19 times [2021-05-22 02:15:34,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:34,049 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825566734] [2021-05-22 02:15:34,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:34,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:34,076 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:34,076 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:34,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825566734] [2021-05-22 02:15:34,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825566734] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:34,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021262946] [2021-05-22 02:15:34,076 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 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 02:15:34,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:34,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:34,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:34,174 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:34,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021262946] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:34,175 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:34,175 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2021-05-22 02:15:34,175 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348815199] [2021-05-22 02:15:34,175 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:15:34,175 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:34,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:15:34,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:15:34,175 INFO L87 Difference]: Start difference. First operand 25964 states and 108117 transitions. Second operand has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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 02:15:34,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:34,861 INFO L93 Difference]: Finished difference Result 47194 states and 183148 transitions. [2021-05-22 02:15:34,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-22 02:15:34,862 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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 28 [2021-05-22 02:15:34,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:35,380 INFO L225 Difference]: With dead ends: 47194 [2021-05-22 02:15:35,381 INFO L226 Difference]: Without dead ends: 47098 [2021-05-22 02:15:35,381 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 228.6ms TimeCoverageRelationStatistics Valid=211, Invalid=781, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:15:35,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47098 states. [2021-05-22 02:15:36,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47098 to 25964. [2021-05-22 02:15:36,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25964 states, 25963 states have (on average 4.16381003736086) internal successors, (108105), 25963 states have internal predecessors, (108105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:36,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25964 states to 25964 states and 108105 transitions. [2021-05-22 02:15:36,175 INFO L78 Accepts]: Start accepts. Automaton has 25964 states and 108105 transitions. Word has length 28 [2021-05-22 02:15:36,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:36,176 INFO L482 AbstractCegarLoop]: Abstraction has 25964 states and 108105 transitions. [2021-05-22 02:15:36,176 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.3) internal successors, (33), 9 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 02:15:36,176 INFO L276 IsEmpty]: Start isEmpty. Operand 25964 states and 108105 transitions. [2021-05-22 02:15:36,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:36,472 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:36,472 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:36,673 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:15:36,673 INFO L430 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:36,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:36,673 INFO L82 PathProgramCache]: Analyzing trace with hash 1673405932, now seen corresponding path program 20 times [2021-05-22 02:15:36,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:36,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977185257] [2021-05-22 02:15:36,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:36,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:36,709 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:36,710 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:36,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977185257] [2021-05-22 02:15:36,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977185257] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:36,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996270356] [2021-05-22 02:15:36,710 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 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 02:15:36,737 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:15:36,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:36,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:36,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:36,811 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:36,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996270356] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:36,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:36,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-05-22 02:15:36,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295654933] [2021-05-22 02:15:36,812 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:15:36,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:36,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:15:36,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:15:36,812 INFO L87 Difference]: Start difference. First operand 25964 states and 108105 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:15:37,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:37,749 INFO L93 Difference]: Finished difference Result 38914 states and 158503 transitions. [2021-05-22 02:15:37,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-22 02:15:37,749 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 28 [2021-05-22 02:15:37,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:37,865 INFO L225 Difference]: With dead ends: 38914 [2021-05-22 02:15:37,865 INFO L226 Difference]: Without dead ends: 38914 [2021-05-22 02:15:37,866 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 319.7ms TimeCoverageRelationStatistics Valid=267, Invalid=923, Unknown=0, NotChecked=0, Total=1190 [2021-05-22 02:15:37,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38914 states. [2021-05-22 02:15:38,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38914 to 26620. [2021-05-22 02:15:38,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26620 states, 26619 states have (on average 4.1402381757391336) internal successors, (110209), 26619 states have internal predecessors, (110209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:38,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26620 states to 26620 states and 110209 transitions. [2021-05-22 02:15:38,785 INFO L78 Accepts]: Start accepts. Automaton has 26620 states and 110209 transitions. Word has length 28 [2021-05-22 02:15:38,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:38,786 INFO L482 AbstractCegarLoop]: Abstraction has 26620 states and 110209 transitions. [2021-05-22 02:15:38,786 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:15:38,786 INFO L276 IsEmpty]: Start isEmpty. Operand 26620 states and 110209 transitions. [2021-05-22 02:15:38,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:38,851 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:38,852 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:39,052 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:15:39,052 INFO L430 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:39,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:39,053 INFO L82 PathProgramCache]: Analyzing trace with hash 1786221247, now seen corresponding path program 21 times [2021-05-22 02:15:39,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:39,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463091435] [2021-05-22 02:15:39,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:39,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:39,093 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:39,093 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:39,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463091435] [2021-05-22 02:15:39,093 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1463091435] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:39,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470518886] [2021-05-22 02:15:39,094 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 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 02:15:39,137 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:15:39,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:39,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:39,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:39,215 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:39,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470518886] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:39,216 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:39,216 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2021-05-22 02:15:39,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855543508] [2021-05-22 02:15:39,216 INFO L462 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-22 02:15:39,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:39,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-22 02:15:39,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-22 02:15:39,217 INFO L87 Difference]: Start difference. First operand 26620 states and 110209 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:15:40,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:40,202 INFO L93 Difference]: Finished difference Result 41610 states and 161108 transitions. [2021-05-22 02:15:40,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-22 02:15:40,203 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 28 [2021-05-22 02:15:40,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:40,323 INFO L225 Difference]: With dead ends: 41610 [2021-05-22 02:15:40,323 INFO L226 Difference]: Without dead ends: 41514 [2021-05-22 02:15:40,323 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 280.0ms TimeCoverageRelationStatistics Valid=198, Invalid=732, Unknown=0, NotChecked=0, Total=930 [2021-05-22 02:15:40,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41514 states. [2021-05-22 02:15:40,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41514 to 27244. [2021-05-22 02:15:40,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27244 states, 27243 states have (on average 4.125646955181147) internal successors, (112395), 27243 states have internal predecessors, (112395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:40,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27244 states to 27244 states and 112395 transitions. [2021-05-22 02:15:40,990 INFO L78 Accepts]: Start accepts. Automaton has 27244 states and 112395 transitions. Word has length 28 [2021-05-22 02:15:40,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:40,990 INFO L482 AbstractCegarLoop]: Abstraction has 27244 states and 112395 transitions. [2021-05-22 02:15:40,990 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 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 02:15:40,990 INFO L276 IsEmpty]: Start isEmpty. Operand 27244 states and 112395 transitions. [2021-05-22 02:15:41,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:41,272 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:41,272 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:41,473 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-22 02:15:41,473 INFO L430 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:41,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:41,473 INFO L82 PathProgramCache]: Analyzing trace with hash -703123463, now seen corresponding path program 22 times [2021-05-22 02:15:41,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:41,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733390797] [2021-05-22 02:15:41,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:41,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:41,498 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:41,498 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:41,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733390797] [2021-05-22 02:15:41,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1733390797] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:41,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118934145] [2021-05-22 02:15:41,498 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 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 02:15:41,524 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:15:41,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:41,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:41,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:41,625 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:41,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118934145] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:41,626 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:41,626 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-05-22 02:15:41,626 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002424027] [2021-05-22 02:15:41,626 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:15:41,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:41,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:15:41,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:15:41,626 INFO L87 Difference]: Start difference. First operand 27244 states and 112395 transitions. Second operand has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 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 02:15:42,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:42,442 INFO L93 Difference]: Finished difference Result 48209 states and 191672 transitions. [2021-05-22 02:15:42,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-22 02:15:42,442 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 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 28 [2021-05-22 02:15:42,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:42,576 INFO L225 Difference]: With dead ends: 48209 [2021-05-22 02:15:42,577 INFO L226 Difference]: Without dead ends: 48209 [2021-05-22 02:15:42,577 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 238.1ms TimeCoverageRelationStatistics Valid=215, Invalid=777, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:15:42,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48209 states. [2021-05-22 02:15:43,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48209 to 26904. [2021-05-22 02:15:43,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26904 states, 26903 states have (on average 4.114225179348028) internal successors, (110685), 26903 states have internal predecessors, (110685), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:43,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26904 states to 26904 states and 110685 transitions. [2021-05-22 02:15:43,581 INFO L78 Accepts]: Start accepts. Automaton has 26904 states and 110685 transitions. Word has length 28 [2021-05-22 02:15:43,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:43,581 INFO L482 AbstractCegarLoop]: Abstraction has 26904 states and 110685 transitions. [2021-05-22 02:15:43,581 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.3636363636363638) internal successors, (37), 10 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 02:15:43,581 INFO L276 IsEmpty]: Start isEmpty. Operand 26904 states and 110685 transitions. [2021-05-22 02:15:43,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-22 02:15:43,641 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:43,641 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:43,844 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,46 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:15:43,844 INFO L430 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:43,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:43,845 INFO L82 PathProgramCache]: Analyzing trace with hash 865070776, now seen corresponding path program 23 times [2021-05-22 02:15:43,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:43,849 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898438702] [2021-05-22 02:15:43,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:43,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:43,879 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:43,879 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:43,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898438702] [2021-05-22 02:15:43,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898438702] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:43,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959832287] [2021-05-22 02:15:43,880 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 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 02:15:43,912 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:15:43,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:43,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-22 02:15:43,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:43,990 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:43,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1959832287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:43,990 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:43,990 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 10 [2021-05-22 02:15:43,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177907603] [2021-05-22 02:15:43,991 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:15:43,991 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:43,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:15:43,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:15:43,991 INFO L87 Difference]: Start difference. First operand 26904 states and 110685 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:44,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:44,820 INFO L93 Difference]: Finished difference Result 35478 states and 139558 transitions. [2021-05-22 02:15:44,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:15:44,822 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-05-22 02:15:44,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:44,937 INFO L225 Difference]: With dead ends: 35478 [2021-05-22 02:15:44,937 INFO L226 Difference]: Without dead ends: 35428 [2021-05-22 02:15:44,938 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 165.2ms TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:15:45,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35428 states. [2021-05-22 02:15:45,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35428 to 26239. [2021-05-22 02:15:45,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26239 states, 26238 states have (on average 4.115595700891836) internal successors, (107985), 26238 states have internal predecessors, (107985), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:45,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26239 states to 26239 states and 107985 transitions. [2021-05-22 02:15:45,693 INFO L78 Accepts]: Start accepts. Automaton has 26239 states and 107985 transitions. Word has length 28 [2021-05-22 02:15:45,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:45,694 INFO L482 AbstractCegarLoop]: Abstraction has 26239 states and 107985 transitions. [2021-05-22 02:15:45,694 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:45,694 INFO L276 IsEmpty]: Start isEmpty. Operand 26239 states and 107985 transitions. [2021-05-22 02:15:45,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-22 02:15:45,756 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:45,756 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:45,956 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-22 02:15:45,957 INFO L430 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:45,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:45,957 INFO L82 PathProgramCache]: Analyzing trace with hash 245948648, now seen corresponding path program 24 times [2021-05-22 02:15:45,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:45,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421186064] [2021-05-22 02:15:45,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:45,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:46,031 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:46,031 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:46,031 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421186064] [2021-05-22 02:15:46,031 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1421186064] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:46,031 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698641848] [2021-05-22 02:15:46,032 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 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 02:15:46,073 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:15:46,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:46,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:15:46,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:46,346 WARN L205 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2021-05-22 02:15:46,630 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:46,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698641848] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:46,630 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:46,630 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10] total 10 [2021-05-22 02:15:46,630 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103963662] [2021-05-22 02:15:46,630 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:15:46,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:46,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:15:46,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:15:46,631 INFO L87 Difference]: Start difference. First operand 26239 states and 107985 transitions. Second operand has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 10 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:47,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:47,488 INFO L93 Difference]: Finished difference Result 29258 states and 119012 transitions. [2021-05-22 02:15:47,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:15:47,488 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 10 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-05-22 02:15:47,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:47,573 INFO L225 Difference]: With dead ends: 29258 [2021-05-22 02:15:47,573 INFO L226 Difference]: Without dead ends: 29122 [2021-05-22 02:15:47,573 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 6 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 369.2ms TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:15:47,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29122 states. [2021-05-22 02:15:48,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29122 to 26985. [2021-05-22 02:15:48,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26985 states, 26984 states have (on average 4.111139934776164) internal successors, (110935), 26984 states have internal predecessors, (110935), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:48,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26985 states to 26985 states and 110935 transitions. [2021-05-22 02:15:48,293 INFO L78 Accepts]: Start accepts. Automaton has 26985 states and 110935 transitions. Word has length 31 [2021-05-22 02:15:48,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:48,293 INFO L482 AbstractCegarLoop]: Abstraction has 26985 states and 110935 transitions. [2021-05-22 02:15:48,293 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.090909090909091) internal successors, (45), 10 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:48,293 INFO L276 IsEmpty]: Start isEmpty. Operand 26985 states and 110935 transitions. [2021-05-22 02:15:48,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-22 02:15:48,356 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:48,356 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:48,556 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:15:48,556 INFO L430 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:48,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:48,557 INFO L82 PathProgramCache]: Analyzing trace with hash -888811328, now seen corresponding path program 25 times [2021-05-22 02:15:48,557 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:48,557 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493623125] [2021-05-22 02:15:48,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:48,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:48,615 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:15:48,616 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:48,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493623125] [2021-05-22 02:15:48,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493623125] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:48,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471931411] [2021-05-22 02:15:48,616 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 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 02:15:48,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:48,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:15:48,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:48,884 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:15:48,885 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471931411] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:48,885 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:15:48,885 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 10] total 11 [2021-05-22 02:15:48,885 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491021902] [2021-05-22 02:15:48,885 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:15:48,885 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:15:48,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:15:48,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:15:48,886 INFO L87 Difference]: Start difference. First operand 26985 states and 110935 transitions. Second operand has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:49,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:15:49,604 INFO L93 Difference]: Finished difference Result 30378 states and 123415 transitions. [2021-05-22 02:15:49,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:15:49,604 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2021-05-22 02:15:49,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:15:49,880 INFO L225 Difference]: With dead ends: 30378 [2021-05-22 02:15:49,880 INFO L226 Difference]: Without dead ends: 30174 [2021-05-22 02:15:49,880 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 156.7ms TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:15:49,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30174 states. [2021-05-22 02:15:50,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30174 to 27681. [2021-05-22 02:15:50,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27681 states, 27680 states have (on average 4.11296965317919) internal successors, (113847), 27680 states have internal predecessors, (113847), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:50,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27681 states to 27681 states and 113847 transitions. [2021-05-22 02:15:50,468 INFO L78 Accepts]: Start accepts. Automaton has 27681 states and 113847 transitions. Word has length 31 [2021-05-22 02:15:50,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:15:50,468 INFO L482 AbstractCegarLoop]: Abstraction has 27681 states and 113847 transitions. [2021-05-22 02:15:50,468 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.0) internal successors, (48), 11 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:15:50,468 INFO L276 IsEmpty]: Start isEmpty. Operand 27681 states and 113847 transitions. [2021-05-22 02:15:50,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-22 02:15:50,527 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:15:50,527 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:15:50,727 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-05-22 02:15:50,728 INFO L430 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:15:50,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:15:50,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1735840200, now seen corresponding path program 26 times [2021-05-22 02:15:50,728 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:15:50,728 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679543223] [2021-05-22 02:15:50,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:15:50,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:15:50,786 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-22 02:15:50,786 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:15:50,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679543223] [2021-05-22 02:15:50,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679543223] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:15:50,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695775420] [2021-05-22 02:15:50,786 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 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 02:15:50,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:15:50,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:15:50,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:15:50,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:15:51,063 WARN L348 FreeRefinementEngine]: Global settings require throwing the following exception [2021-05-22 02:15:51,284 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-22 02:15:51,285 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: Possible infinite loop detected aux_div_aux_div_aux_mod_x1_24_53_119 already exists at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.polynomials.SolveForSubjectUtils.tryToHandleDivModSubterm(SolveForSubjectUtils.java:198) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.polynomials.SolveForSubjectUtils.findTreatableDivModSubterm(SolveForSubjectUtils.java:585) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.polynomials.SolveForSubjectUtils.findTreatableDivModSubterm(SolveForSubjectUtils.java:573) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.polynomials.SolveForSubjectUtils.solveForSubject(SolveForSubjectUtils.java:76) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.polynomials.PolynomialRelation.solveForSubject(PolynomialRelation.java:451) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.polynomials.SolveForSubjectUtils.tryToHandleDivModSubterm(SolveForSubjectUtils.java:212) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.polynomials.SolveForSubjectUtils.findTreatableDivModSubterm(SolveForSubjectUtils.java:585) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.polynomials.SolveForSubjectUtils.findTreatableDivModSubterm(SolveForSubjectUtils.java:573) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.polynomials.SolveForSubjectUtils.solveForSubject(SolveForSubjectUtils.java:76) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.polynomials.PolynomialRelation.solveForSubject(PolynomialRelation.java:451) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionDer$DerHelperMcsbr.solveForSubject(DualJunctionDer.java:408) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionDer$DerHelperMcsbr.solveForSubject(DualJunctionDer.java:1) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionDer$IDerHelper.findBestReplacementSbr(DualJunctionDer.java:312) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionDer$IDerHelper.tryToEliminateSbr(DualJunctionDer.java:328) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionDer.tryToEliminateOne(DualJunctionDer.java:231) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionDer.tryExhaustivelyToEliminate(DualJunctionDer.java:198) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionDer.tryToEliminateOne(DualJunctionDer.java:182) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionDer.tryExhaustivelyToEliminate(DualJunctionDer.java:149) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionDer.tryToEliminate(DualJunctionDer.java:127) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToEliminateOne(QuantifierPusher.java:869) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.applyNewEliminationTechniquesExhaustively(QuantifierPusher.java:835) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.applyDualJunctionEliminationTechniques(QuantifierPusher.java:753) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToPushOverDualFiniteConnective2(QuantifierPusher.java:384) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToPushOverDualFiniteConnective(QuantifierPusher.java:316) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.convert(QuantifierPusher.java:227) at de.uni_freiburg.informatik.ultimate.logic.TermTransformer.cacheConvert(TermTransformer.java:131) at de.uni_freiburg.informatik.ultimate.logic.TermTransformer$Convert.walk(TermTransformer.java:79) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:115) at de.uni_freiburg.informatik.ultimate.logic.NonRecursive.run(NonRecursive.java:106) at de.uni_freiburg.informatik.ultimate.logic.TermTransformer.transform(TermTransformer.java:272) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.eliminate(QuantifierPusher.java:144) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.eliminate(QuantifierPusher.java:166) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp$LiveVariablesPostprocessorForward.postprocess(TraceCheckSpWp.java:539) 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 02:15:51,290 INFO L168 Benchmark]: Toolchain (without parser) took 85921.64 ms. Allocated memory was 354.4 MB in the beginning and 12.9 GB in the end (delta: 12.6 GB). Free memory was 334.1 MB in the beginning and 9.4 GB in the end (delta: -9.1 GB). Peak memory consumption was 3.5 GB. Max. memory is 16.0 GB. [2021-05-22 02:15:51,290 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 354.4 MB. Free memory was 335.2 MB in the beginning and 335.0 MB in the end (delta: 126.0 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:15:51,290 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.00 ms. Allocated memory is still 354.4 MB. Free memory was 333.9 MB in the beginning and 332.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-05-22 02:15:51,290 INFO L168 Benchmark]: Boogie Preprocessor took 20.83 ms. Allocated memory is still 354.4 MB. Free memory was 332.5 MB in the beginning and 331.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-05-22 02:15:51,290 INFO L168 Benchmark]: RCFGBuilder took 267.91 ms. Allocated memory is still 354.4 MB. Free memory was 331.5 MB in the beginning and 319.7 MB in the end (delta: 11.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.0 GB. [2021-05-22 02:15:51,290 INFO L168 Benchmark]: TraceAbstraction took 85597.32 ms. Allocated memory was 354.4 MB in the beginning and 12.9 GB in the end (delta: 12.6 GB). Free memory was 319.3 MB in the beginning and 9.4 GB in the end (delta: -9.1 GB). Peak memory consumption was 3.5 GB. Max. memory is 16.0 GB. [2021-05-22 02:15:51,291 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 354.4 MB. Free memory was 335.2 MB in the beginning and 335.0 MB in the end (delta: 126.0 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 30.00 ms. Allocated memory is still 354.4 MB. Free memory was 333.9 MB in the beginning and 332.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * Boogie Preprocessor took 20.83 ms. Allocated memory is still 354.4 MB. Free memory was 332.5 MB in the beginning and 331.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * RCFGBuilder took 267.91 ms. Allocated memory is still 354.4 MB. Free memory was 331.5 MB in the beginning and 319.7 MB in the end (delta: 11.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.0 GB. * TraceAbstraction took 85597.32 ms. Allocated memory was 354.4 MB in the beginning and 12.9 GB in the end (delta: 12.6 GB). Free memory was 319.3 MB in the beginning and 9.4 GB in the end (delta: -9.1 GB). Peak memory consumption was 3.5 GB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: Possible infinite loop detected aux_div_aux_div_aux_mod_x1_24_53_119 already exists de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: Possible infinite loop detected aux_div_aux_div_aux_mod_x1_24_53_119 already exists: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.polynomials.SolveForSubjectUtils.tryToHandleDivModSubterm(SolveForSubjectUtils.java:198) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...