/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.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/test/context1.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-a865e3bea3ade1065a4c95009cfa501fe03c5538-a865e3b [2021-02-19 20:35:38,044 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-19 20:35:38,046 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-19 20:35:38,077 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-19 20:35:38,142 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.epf [2021-02-19 20:35:38,187 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-19 20:35:38,187 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-19 20:35:38,188 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-02-19 20:35:38,188 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-02-19 20:35:38,191 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-02-19 20:35:38,192 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-02-19 20:35:38,192 INFO L138 SettingsManager]: * Use SBE=true [2021-02-19 20:35:38,192 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-19 20:35:38,192 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-19 20:35:38,192 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-19 20:35:38,193 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-19 20:35:38,194 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-19 20:35:38,194 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-19 20:35:38,194 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-19 20:35:38,194 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-19 20:35:38,194 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-19 20:35:38,194 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-19 20:35:38,194 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-19 20:35:38,194 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-19 20:35:38,195 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-19 20:35:38,195 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-02-19 20:35:38,195 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-19 20:35:38,195 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-19 20:35:38,195 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-19 20:35:38,195 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-19 20:35:38,195 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-02-19 20:35:38,196 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-02-19 20:35:38,196 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-02-19 20:35:38,196 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-02-19 20:35:38,196 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-02-19 20:35:38,196 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-19 20:35:38,196 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-19 20:35:38,481 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-19 20:35:38,501 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-19 20:35:38,503 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-19 20:35:38,504 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-02-19 20:35:38,507 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-02-19 20:35:38,508 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/test/context1.wvr.bpl [2021-02-19 20:35:38,508 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/test/context1.wvr.bpl' [2021-02-19 20:35:38,536 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-19 20:35:38,540 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-19 20:35:38,541 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-02-19 20:35:38,542 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-02-19 20:35:38,542 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-02-19 20:35:38,554 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:35:38" (1/1) ... [2021-02-19 20:35:38,561 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:35:38" (1/1) ... [2021-02-19 20:35:38,569 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-02-19 20:35:38,570 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-19 20:35:38,571 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-19 20:35:38,571 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-19 20:35:38,577 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:35:38" (1/1) ... [2021-02-19 20:35:38,577 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:35:38" (1/1) ... [2021-02-19 20:35:38,577 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:35:38" (1/1) ... [2021-02-19 20:35:38,577 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:35:38" (1/1) ... [2021-02-19 20:35:38,580 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:35:38" (1/1) ... [2021-02-19 20:35:38,583 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:35:38" (1/1) ... [2021-02-19 20:35:38,584 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:35:38" (1/1) ... [2021-02-19 20:35:38,585 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-19 20:35:38,585 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-19 20:35:38,586 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-19 20:35:38,586 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-19 20:35:38,588 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:35:38" (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 [2021-02-19 20:35:38,673 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-02-19 20:35:38,674 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-02-19 20:35:38,674 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-02-19 20:35:38,674 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-02-19 20:35:38,674 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-02-19 20:35:38,675 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-02-19 20:35:38,675 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-02-19 20:35:38,675 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-19 20:35:38,675 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-19 20:35:38,676 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-02-19 20:35:38,908 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-19 20:35:38,909 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-02-19 20:35:38,909 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread1EXIT is neither atomic block end nor error location. [2021-02-19 20:35:38,910 WARN L327 CfgBuilder]: Unexpected successor node of atomic block begin: thread2EXIT is neither atomic block end nor error location. [2021-02-19 20:35:38,911 INFO L202 PluginConnector]: Adding new model context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.02 08:35:38 BoogieIcfgContainer [2021-02-19 20:35:38,911 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-19 20:35:38,912 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-19 20:35:38,912 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-19 20:35:38,915 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-19 20:35:38,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 19.02 08:35:38" (1/2) ... [2021-02-19 20:35:38,916 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45727755 and model type context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.02 08:35:38, skipping insertion in model container [2021-02-19 20:35:38,916 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.02 08:35:38" (2/2) ... [2021-02-19 20:35:38,917 INFO L111 eAbstractionObserver]: Analyzing ICFG context1.wvr.bpl [2021-02-19 20:35:38,921 WARN L142 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-02-19 20:35:38,922 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-02-19 20:35:38,924 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-19 20:35:38,925 INFO L323 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-02-19 20:35:38,952 INFO L149 ThreadInstanceAdder]: Constructed 2 joinOtherThreadTransitions. [2021-02-19 20:35:38,980 INFO L253 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-02-19 20:35:39,016 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-19 20:35:39,016 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-19 20:35:39,016 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-02-19 20:35:39,016 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-19 20:35:39,016 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-19 20:35:39,016 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-19 20:35:39,017 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-19 20:35:39,017 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-19 20:35:39,041 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 20 places, 15 transitions, 46 flow [2021-02-19 20:35:39,067 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:39,068 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:39,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-02-19 20:35:39,078 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:35:39,078 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:35:39,079 INFO L428 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:35:39,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:35:39,087 INFO L82 PathProgramCache]: Analyzing trace with hash 581574788, now seen corresponding path program 1 times [2021-02-19 20:35:39,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:35:39,095 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360271609] [2021-02-19 20:35:39,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:35:39,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:35:39,200 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:39,201 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360271609] [2021-02-19 20:35:39,202 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 20:35:39,202 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-02-19 20:35:39,202 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960319777] [2021-02-19 20:35:39,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-19 20:35:39,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:35:39,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-19 20:35:39,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:35:39,220 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:39,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:35:39,242 INFO L93 Difference]: Finished difference Result 20 states and 34 transitions. [2021-02-19 20:35:39,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-19 20:35:39,244 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-02-19 20:35:39,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:35:39,254 INFO L225 Difference]: With dead ends: 20 [2021-02-19 20:35:39,254 INFO L226 Difference]: Without dead ends: 16 [2021-02-19 20:35:39,255 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:35:39,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-02-19 20:35:39,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-02-19 20:35:39,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:39,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 27 transitions. [2021-02-19 20:35:39,278 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 27 transitions. Word has length 9 [2021-02-19 20:35:39,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:35:39,279 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 27 transitions. [2021-02-19 20:35:39,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:39,279 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 27 transitions. [2021-02-19 20:35:39,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-02-19 20:35:39,280 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:35:39,280 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:35:39,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-19 20:35:39,281 INFO L428 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:35:39,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:35:39,284 INFO L82 PathProgramCache]: Analyzing trace with hash 849676697, now seen corresponding path program 1 times [2021-02-19 20:35:39,284 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:35:39,284 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731195643] [2021-02-19 20:35:39,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:35:39,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:35:39,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:39,339 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731195643] [2021-02-19 20:35:39,339 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-19 20:35:39,339 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-02-19 20:35:39,339 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406128915] [2021-02-19 20:35:39,340 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-19 20:35:39,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:35:39,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-19 20:35:39,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:35:39,341 INFO L87 Difference]: Start difference. First operand 16 states and 27 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:39,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:35:39,352 INFO L93 Difference]: Finished difference Result 21 states and 34 transitions. [2021-02-19 20:35:39,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-19 20:35:39,353 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-02-19 20:35:39,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:35:39,353 INFO L225 Difference]: With dead ends: 21 [2021-02-19 20:35:39,354 INFO L226 Difference]: Without dead ends: 18 [2021-02-19 20:35:39,354 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-19 20:35:39,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-02-19 20:35:39,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-02-19 20:35:39,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 17 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:39,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 30 transitions. [2021-02-19 20:35:39,358 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 30 transitions. Word has length 10 [2021-02-19 20:35:39,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:35:39,358 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 30 transitions. [2021-02-19 20:35:39,358 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:39,358 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 30 transitions. [2021-02-19 20:35:39,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-02-19 20:35:39,359 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:35:39,359 INFO L506 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:35:39,359 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-19 20:35:39,359 INFO L428 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:35:39,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:35:39,360 INFO L82 PathProgramCache]: Analyzing trace with hash 414931746, now seen corresponding path program 1 times [2021-02-19 20:35:39,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:35:39,360 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [89143678] [2021-02-19 20:35:39,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:35:39,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:35:39,437 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:39,438 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [89143678] [2021-02-19 20:35:39,439 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435274729] [2021-02-19 20:35:39,439 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 [2021-02-19 20:35:39,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:35:39,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 7 conjunts are in the unsatisfiable core [2021-02-19 20:35:39,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:35:39,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-02-19 20:35:39,619 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 20:35:39,621 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 20:35:39,622 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 20:35:39,622 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-02-19 20:35:39,634 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:39,635 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:35:39,635 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-02-19 20:35:39,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077591930] [2021-02-19 20:35:39,636 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-19 20:35:39,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:35:39,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-19 20:35:39,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-02-19 20:35:39,642 INFO L87 Difference]: Start difference. First operand 18 states and 30 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:39,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:35:39,703 INFO L93 Difference]: Finished difference Result 25 states and 43 transitions. [2021-02-19 20:35:39,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-02-19 20:35:39,704 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2021-02-19 20:35:39,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:35:39,706 INFO L225 Difference]: With dead ends: 25 [2021-02-19 20:35:39,711 INFO L226 Difference]: Without dead ends: 21 [2021-02-19 20:35:39,711 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-02-19 20:35:39,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-02-19 20:35:39,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-02-19 20:35:39,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.8) internal successors, (36), 20 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:39,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 36 transitions. [2021-02-19 20:35:39,721 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 36 transitions. Word has length 11 [2021-02-19 20:35:39,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:35:39,721 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 36 transitions. [2021-02-19 20:35:39,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:39,722 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 36 transitions. [2021-02-19 20:35:39,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-02-19 20:35:39,722 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:35:39,723 INFO L506 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:35:39,945 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-02-19 20:35:39,945 INFO L428 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:35:39,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:35:39,946 INFO L82 PathProgramCache]: Analyzing trace with hash -21290309, now seen corresponding path program 2 times [2021-02-19 20:35:39,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:35:39,946 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154044393] [2021-02-19 20:35:39,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:35:39,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:35:39,974 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:39,974 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154044393] [2021-02-19 20:35:39,974 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279070588] [2021-02-19 20:35:39,974 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:35:40,005 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 20:35:40,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:35:40,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 4 conjunts are in the unsatisfiable core [2021-02-19 20:35:40,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:35:40,092 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:40,093 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:35:40,093 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 3 [2021-02-19 20:35:40,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642291458] [2021-02-19 20:35:40,093 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-02-19 20:35:40,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:35:40,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-02-19 20:35:40,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-02-19 20:35:40,094 INFO L87 Difference]: Start difference. First operand 21 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:40,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:35:40,113 INFO L93 Difference]: Finished difference Result 50 states and 82 transitions. [2021-02-19 20:35:40,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-02-19 20:35:40,117 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-02-19 20:35:40,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:35:40,120 INFO L225 Difference]: With dead ends: 50 [2021-02-19 20:35:40,120 INFO L226 Difference]: Without dead ends: 45 [2021-02-19 20:35:40,120 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-02-19 20:35:40,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-02-19 20:35:40,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 33. [2021-02-19 20:35:40,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.9375) internal successors, (62), 32 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:40,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 62 transitions. [2021-02-19 20:35:40,126 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 62 transitions. Word has length 12 [2021-02-19 20:35:40,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:35:40,126 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 62 transitions. [2021-02-19 20:35:40,126 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:40,126 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 62 transitions. [2021-02-19 20:35:40,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-02-19 20:35:40,127 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:35:40,127 INFO L506 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:35:40,346 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:35:40,346 INFO L428 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:35:40,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:35:40,347 INFO L82 PathProgramCache]: Analyzing trace with hash -1199360508, now seen corresponding path program 3 times [2021-02-19 20:35:40,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:35:40,347 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801795439] [2021-02-19 20:35:40,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:35:40,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:35:40,405 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:40,405 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801795439] [2021-02-19 20:35:40,406 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185995358] [2021-02-19 20:35:40,406 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:35:40,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-02-19 20:35:40,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:35:40,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2021-02-19 20:35:40,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:35:40,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-02-19 20:35:40,556 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 20:35:40,558 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 20:35:40,559 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 20:35:40,559 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-02-19 20:35:40,570 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:40,570 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:35:40,571 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-02-19 20:35:40,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114357888] [2021-02-19 20:35:40,571 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-02-19 20:35:40,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:35:40,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-02-19 20:35:40,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-02-19 20:35:40,572 INFO L87 Difference]: Start difference. First operand 33 states and 62 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:40,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:35:40,662 INFO L93 Difference]: Finished difference Result 65 states and 115 transitions. [2021-02-19 20:35:40,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 20:35:40,662 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-02-19 20:35:40,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:35:40,663 INFO L225 Difference]: With dead ends: 65 [2021-02-19 20:35:40,663 INFO L226 Difference]: Without dead ends: 39 [2021-02-19 20:35:40,663 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-02-19 20:35:40,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-02-19 20:35:40,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 26. [2021-02-19 20:35:40,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.84) internal successors, (46), 25 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:40,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 46 transitions. [2021-02-19 20:35:40,668 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 46 transitions. Word has length 13 [2021-02-19 20:35:40,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:35:40,668 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 46 transitions. [2021-02-19 20:35:40,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:40,668 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 46 transitions. [2021-02-19 20:35:40,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-02-19 20:35:40,669 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:35:40,669 INFO L506 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:35:40,887 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:35:40,888 INFO L428 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:35:40,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:35:40,888 INFO L82 PathProgramCache]: Analyzing trace with hash 1475257369, now seen corresponding path program 4 times [2021-02-19 20:35:40,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:35:40,889 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757024100] [2021-02-19 20:35:40,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:35:40,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:35:40,934 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:40,934 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757024100] [2021-02-19 20:35:40,934 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [539185140] [2021-02-19 20:35:40,934 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:35:40,973 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 20:35:40,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:35:40,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 6 conjunts are in the unsatisfiable core [2021-02-19 20:35:40,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:35:41,040 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:41,041 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:35:41,043 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2021-02-19 20:35:41,043 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291424213] [2021-02-19 20:35:41,043 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-19 20:35:41,045 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:35:41,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-19 20:35:41,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-02-19 20:35:41,047 INFO L87 Difference]: Start difference. First operand 26 states and 46 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:41,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:35:41,062 INFO L93 Difference]: Finished difference Result 73 states and 125 transitions. [2021-02-19 20:35:41,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-02-19 20:35:41,063 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-02-19 20:35:41,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:35:41,066 INFO L225 Difference]: With dead ends: 73 [2021-02-19 20:35:41,067 INFO L226 Difference]: Without dead ends: 66 [2021-02-19 20:35:41,067 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-02-19 20:35:41,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-02-19 20:35:41,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 48. [2021-02-19 20:35:41,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 2.021276595744681) internal successors, (95), 47 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:41,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 95 transitions. [2021-02-19 20:35:41,091 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 95 transitions. Word has length 14 [2021-02-19 20:35:41,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:35:41,091 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 95 transitions. [2021-02-19 20:35:41,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:41,091 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 95 transitions. [2021-02-19 20:35:41,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-02-19 20:35:41,092 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:35:41,092 INFO L506 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:35:41,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:35:41,313 INFO L428 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:35:41,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:35:41,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1073805022, now seen corresponding path program 5 times [2021-02-19 20:35:41,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:35:41,313 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623241610] [2021-02-19 20:35:41,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:35:41,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:35:41,435 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:41,435 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623241610] [2021-02-19 20:35:41,435 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706362328] [2021-02-19 20:35:41,435 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:35:41,471 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-02-19 20:35:41,472 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:35:41,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 16 conjunts are in the unsatisfiable core [2021-02-19 20:35:41,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:35:43,710 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-02-19 20:35:43,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 10 [2021-02-19 20:35:43,712 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 20:35:43,718 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 20:35:43,720 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 20:35:43,720 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:20, output treesize:3 [2021-02-19 20:35:43,743 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 9 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:35:43,743 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:35:43,743 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-02-19 20:35:43,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676586475] [2021-02-19 20:35:43,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-02-19 20:35:43,744 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:35:43,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-02-19 20:35:43,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=168, Unknown=1, NotChecked=0, Total=210 [2021-02-19 20:35:43,744 INFO L87 Difference]: Start difference. First operand 48 states and 95 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:35:50,255 WARN L202 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 25 [2021-02-19 20:36:02,381 WARN L202 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 23 [2021-02-19 20:36:02,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:02,415 INFO L93 Difference]: Finished difference Result 229 states and 428 transitions. [2021-02-19 20:36:02,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-02-19 20:36:02,415 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-02-19 20:36:02,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:02,416 INFO L225 Difference]: With dead ends: 229 [2021-02-19 20:36:02,416 INFO L226 Difference]: Without dead ends: 116 [2021-02-19 20:36:02,417 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=215, Invalid=770, Unknown=7, NotChecked=0, Total=992 [2021-02-19 20:36:02,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-02-19 20:36:02,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 56. [2021-02-19 20:36:02,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 2.0545454545454547) internal successors, (113), 55 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:02,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 113 transitions. [2021-02-19 20:36:02,422 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 113 transitions. Word has length 15 [2021-02-19 20:36:02,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:02,422 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 113 transitions. [2021-02-19 20:36:02,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:02,423 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 113 transitions. [2021-02-19 20:36:02,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-02-19 20:36:02,423 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:02,423 INFO L506 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:02,624 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-02-19 20:36:02,624 INFO L428 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:02,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:02,625 INFO L82 PathProgramCache]: Analyzing trace with hash -445088892, now seen corresponding path program 6 times [2021-02-19 20:36:02,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:02,625 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1592097868] [2021-02-19 20:36:02,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:02,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:02,775 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:02,775 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1592097868] [2021-02-19 20:36:02,775 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854935043] [2021-02-19 20:36:02,775 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-02-19 20:36:02,802 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-02-19 20:36:02,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:36:02,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2021-02-19 20:36:02,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:02,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-02-19 20:36:02,863 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 20:36:02,865 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 20:36:02,865 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 20:36:02,866 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-02-19 20:36:02,875 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:02,876 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:02,876 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2021-02-19 20:36:02,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67206551] [2021-02-19 20:36:02,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 20:36:02,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:02,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 20:36:02,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2021-02-19 20:36:02,877 INFO L87 Difference]: Start difference. First operand 56 states and 113 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:03,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:03,070 INFO L93 Difference]: Finished difference Result 121 states and 226 transitions. [2021-02-19 20:36:03,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-19 20:36:03,071 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-02-19 20:36:03,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:03,072 INFO L225 Difference]: With dead ends: 121 [2021-02-19 20:36:03,072 INFO L226 Difference]: Without dead ends: 77 [2021-02-19 20:36:03,072 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2021-02-19 20:36:03,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-02-19 20:36:03,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 36. [2021-02-19 20:36:03,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 35 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:03,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 66 transitions. [2021-02-19 20:36:03,085 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 66 transitions. Word has length 17 [2021-02-19 20:36:03,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:03,085 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 66 transitions. [2021-02-19 20:36:03,085 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:03,085 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 66 transitions. [2021-02-19 20:36:03,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-02-19 20:36:03,086 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:03,086 INFO L506 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:03,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:03,287 INFO L428 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:03,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:03,287 INFO L82 PathProgramCache]: Analyzing trace with hash -912126311, now seen corresponding path program 7 times [2021-02-19 20:36:03,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:03,287 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74780007] [2021-02-19 20:36:03,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:03,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:03,332 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:03,332 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74780007] [2021-02-19 20:36:03,332 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559698331] [2021-02-19 20:36:03,332 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:03,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:03,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2021-02-19 20:36:03,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:03,421 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:03,421 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:03,421 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2021-02-19 20:36:03,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311519306] [2021-02-19 20:36:03,425 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-02-19 20:36:03,425 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:03,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-02-19 20:36:03,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-02-19 20:36:03,426 INFO L87 Difference]: Start difference. First operand 36 states and 66 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:03,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:03,444 INFO L93 Difference]: Finished difference Result 128 states and 229 transitions. [2021-02-19 20:36:03,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-19 20:36:03,444 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-02-19 20:36:03,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:03,445 INFO L225 Difference]: With dead ends: 128 [2021-02-19 20:36:03,445 INFO L226 Difference]: Without dead ends: 117 [2021-02-19 20:36:03,445 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-02-19 20:36:03,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-02-19 20:36:03,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 87. [2021-02-19 20:36:03,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 2.0813953488372094) internal successors, (179), 86 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:03,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 179 transitions. [2021-02-19 20:36:03,454 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 179 transitions. Word has length 18 [2021-02-19 20:36:03,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:03,454 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 179 transitions. [2021-02-19 20:36:03,454 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:03,454 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 179 transitions. [2021-02-19 20:36:03,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-02-19 20:36:03,455 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:03,455 INFO L506 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:03,666 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:03,666 INFO L428 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:03,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:03,666 INFO L82 PathProgramCache]: Analyzing trace with hash 964085538, now seen corresponding path program 8 times [2021-02-19 20:36:03,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:03,667 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851237503] [2021-02-19 20:36:03,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:03,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:03,832 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:03,832 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851237503] [2021-02-19 20:36:03,833 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360820284] [2021-02-19 20:36:03,833 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:03,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 20:36:03,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:36:03,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 23 conjunts are in the unsatisfiable core [2021-02-19 20:36:03,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:03,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-02-19 20:36:03,948 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 20:36:03,950 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 20:36:03,951 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 20:36:03,951 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-02-19 20:36:03,958 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:03,958 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:03,958 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 12 [2021-02-19 20:36:03,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671617437] [2021-02-19 20:36:03,960 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-02-19 20:36:03,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:03,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-02-19 20:36:03,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-02-19 20:36:03,961 INFO L87 Difference]: Start difference. First operand 87 states and 179 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 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) [2021-02-19 20:36:04,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:04,193 INFO L93 Difference]: Finished difference Result 179 states and 337 transitions. [2021-02-19 20:36:04,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-02-19 20:36:04,193 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 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 [2021-02-19 20:36:04,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:04,194 INFO L225 Difference]: With dead ends: 179 [2021-02-19 20:36:04,194 INFO L226 Difference]: Without dead ends: 105 [2021-02-19 20:36:04,194 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2021-02-19 20:36:04,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-02-19 20:36:04,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 41. [2021-02-19 20:36:04,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.9) internal successors, (76), 40 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:04,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 76 transitions. [2021-02-19 20:36:04,197 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 76 transitions. Word has length 19 [2021-02-19 20:36:04,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:04,198 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 76 transitions. [2021-02-19 20:36:04,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 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) [2021-02-19 20:36:04,198 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 76 transitions. [2021-02-19 20:36:04,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-02-19 20:36:04,198 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:04,198 INFO L506 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:04,406 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-02-19 20:36:04,406 INFO L428 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:04,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:04,406 INFO L82 PathProgramCache]: Analyzing trace with hash -177391941, now seen corresponding path program 9 times [2021-02-19 20:36:04,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:04,407 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306996952] [2021-02-19 20:36:04,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:04,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:04,457 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:04,457 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306996952] [2021-02-19 20:36:04,457 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1961817431] [2021-02-19 20:36:04,457 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:04,479 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-02-19 20:36:04,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:36:04,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 12 conjunts are in the unsatisfiable core [2021-02-19 20:36:04,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:04,558 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:04,558 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:04,558 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2021-02-19 20:36:04,559 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897321081] [2021-02-19 20:36:04,559 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-19 20:36:04,559 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:04,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-19 20:36:04,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-02-19 20:36:04,560 INFO L87 Difference]: Start difference. First operand 41 states and 76 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:04,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:04,588 INFO L93 Difference]: Finished difference Result 160 states and 290 transitions. [2021-02-19 20:36:04,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-19 20:36:04,589 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-02-19 20:36:04,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:04,591 INFO L225 Difference]: With dead ends: 160 [2021-02-19 20:36:04,591 INFO L226 Difference]: Without dead ends: 147 [2021-02-19 20:36:04,592 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-02-19 20:36:04,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-02-19 20:36:04,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 111. [2021-02-19 20:36:04,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 110 states have (on average 2.090909090909091) internal successors, (230), 110 states have internal predecessors, (230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:04,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 230 transitions. [2021-02-19 20:36:04,602 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 230 transitions. Word has length 20 [2021-02-19 20:36:04,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:04,602 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 230 transitions. [2021-02-19 20:36:04,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:04,603 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 230 transitions. [2021-02-19 20:36:04,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-02-19 20:36:04,604 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:04,604 INFO L506 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:04,825 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:04,825 INFO L428 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:04,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:04,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1024069372, now seen corresponding path program 10 times [2021-02-19 20:36:04,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:04,826 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109224619] [2021-02-19 20:36:04,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:04,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:05,020 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:05,021 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109224619] [2021-02-19 20:36:05,021 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594065593] [2021-02-19 20:36:05,021 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:05,042 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 20:36:05,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:36:05,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 27 conjunts are in the unsatisfiable core [2021-02-19 20:36:05,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:05,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-02-19 20:36:05,125 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 20:36:05,126 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 20:36:05,127 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 20:36:05,127 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-02-19 20:36:05,135 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:05,135 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:05,135 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 14 [2021-02-19 20:36:05,135 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456194736] [2021-02-19 20:36:05,136 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-02-19 20:36:05,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:05,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-02-19 20:36:05,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2021-02-19 20:36:05,137 INFO L87 Difference]: Start difference. First operand 111 states and 230 transitions. Second operand has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:05,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:05,479 INFO L93 Difference]: Finished difference Result 229 states and 435 transitions. [2021-02-19 20:36:05,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-02-19 20:36:05,480 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-02-19 20:36:05,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:05,481 INFO L225 Difference]: With dead ends: 229 [2021-02-19 20:36:05,481 INFO L226 Difference]: Without dead ends: 135 [2021-02-19 20:36:05,482 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=135, Invalid=567, Unknown=0, NotChecked=0, Total=702 [2021-02-19 20:36:05,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-02-19 20:36:05,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 46. [2021-02-19 20:36:05,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.9111111111111112) internal successors, (86), 45 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:05,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 86 transitions. [2021-02-19 20:36:05,485 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 86 transitions. Word has length 21 [2021-02-19 20:36:05,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:05,485 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 86 transitions. [2021-02-19 20:36:05,485 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.4) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:05,485 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 86 transitions. [2021-02-19 20:36:05,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-02-19 20:36:05,486 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:05,486 INFO L506 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:05,709 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:05,709 INFO L428 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:05,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:05,709 INFO L82 PathProgramCache]: Analyzing trace with hash -1680652007, now seen corresponding path program 11 times [2021-02-19 20:36:05,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:05,710 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029680655] [2021-02-19 20:36:05,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:05,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:05,793 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:05,793 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029680655] [2021-02-19 20:36:05,793 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964290973] [2021-02-19 20:36:05,793 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:05,830 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-02-19 20:36:05,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:36:05,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 14 conjunts are in the unsatisfiable core [2021-02-19 20:36:05,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:05,901 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:05,901 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:05,902 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2021-02-19 20:36:05,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061579453] [2021-02-19 20:36:05,903 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-19 20:36:05,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:05,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-19 20:36:05,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-02-19 20:36:05,904 INFO L87 Difference]: Start difference. First operand 46 states and 86 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 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) [2021-02-19 20:36:05,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:05,931 INFO L93 Difference]: Finished difference Result 195 states and 357 transitions. [2021-02-19 20:36:05,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-02-19 20:36:05,932 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 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 [2021-02-19 20:36:05,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:05,934 INFO L225 Difference]: With dead ends: 195 [2021-02-19 20:36:05,934 INFO L226 Difference]: Without dead ends: 180 [2021-02-19 20:36:05,934 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-02-19 20:36:05,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-02-19 20:36:05,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 138. [2021-02-19 20:36:05,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 137 states have (on average 2.0948905109489053) internal successors, (287), 137 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:05,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 287 transitions. [2021-02-19 20:36:05,941 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 287 transitions. Word has length 22 [2021-02-19 20:36:05,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:05,942 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 287 transitions. [2021-02-19 20:36:05,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 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) [2021-02-19 20:36:05,942 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 287 transitions. [2021-02-19 20:36:05,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-02-19 20:36:05,944 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:05,945 INFO L506 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:06,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-02-19 20:36:06,158 INFO L428 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:06,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:06,158 INFO L82 PathProgramCache]: Analyzing trace with hash 706123042, now seen corresponding path program 12 times [2021-02-19 20:36:06,158 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:06,158 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157235143] [2021-02-19 20:36:06,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:06,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:06,357 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:06,357 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157235143] [2021-02-19 20:36:06,358 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083758488] [2021-02-19 20:36:06,358 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-02-19 20:36:06,380 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-02-19 20:36:06,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:36:06,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 31 conjunts are in the unsatisfiable core [2021-02-19 20:36:06,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:06,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-02-19 20:36:06,464 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 20:36:06,470 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 20:36:06,470 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 20:36:06,471 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-02-19 20:36:06,477 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:06,477 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:06,477 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 16 [2021-02-19 20:36:06,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308695919] [2021-02-19 20:36:06,478 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-02-19 20:36:06,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:06,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-02-19 20:36:06,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2021-02-19 20:36:06,479 INFO L87 Difference]: Start difference. First operand 138 states and 287 transitions. Second operand has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:06,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:06,908 INFO L93 Difference]: Finished difference Result 285 states and 545 transitions. [2021-02-19 20:36:06,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-02-19 20:36:06,909 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2021-02-19 20:36:06,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:06,911 INFO L225 Difference]: With dead ends: 285 [2021-02-19 20:36:06,911 INFO L226 Difference]: Without dead ends: 169 [2021-02-19 20:36:06,912 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2021-02-19 20:36:06,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-02-19 20:36:06,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 51. [2021-02-19 20:36:06,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.92) internal successors, (96), 50 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:06,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 96 transitions. [2021-02-19 20:36:06,914 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 96 transitions. Word has length 23 [2021-02-19 20:36:06,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:06,915 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 96 transitions. [2021-02-19 20:36:06,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 16 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:06,915 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 96 transitions. [2021-02-19 20:36:06,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-02-19 20:36:06,915 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:06,915 INFO L506 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:07,130 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-02-19 20:36:07,130 INFO L428 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:07,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:07,130 INFO L82 PathProgramCache]: Analyzing trace with hash 415705275, now seen corresponding path program 13 times [2021-02-19 20:36:07,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:07,130 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104985304] [2021-02-19 20:36:07,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:07,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:07,211 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:07,211 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104985304] [2021-02-19 20:36:07,211 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1128768491] [2021-02-19 20:36:07,211 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:07,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:07,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 16 conjunts are in the unsatisfiable core [2021-02-19 20:36:07,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:07,364 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:07,364 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:07,365 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2021-02-19 20:36:07,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894236679] [2021-02-19 20:36:07,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-19 20:36:07,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:07,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-19 20:36:07,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-02-19 20:36:07,367 INFO L87 Difference]: Start difference. First operand 51 states and 96 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:07,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:07,398 INFO L93 Difference]: Finished difference Result 233 states and 430 transitions. [2021-02-19 20:36:07,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-02-19 20:36:07,398 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2021-02-19 20:36:07,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:07,399 INFO L225 Difference]: With dead ends: 233 [2021-02-19 20:36:07,400 INFO L226 Difference]: Without dead ends: 216 [2021-02-19 20:36:07,401 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-02-19 20:36:07,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2021-02-19 20:36:07,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 168. [2021-02-19 20:36:07,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 167 states have (on average 2.095808383233533) internal successors, (350), 167 states have internal predecessors, (350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:07,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 350 transitions. [2021-02-19 20:36:07,407 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 350 transitions. Word has length 24 [2021-02-19 20:36:07,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:07,407 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 350 transitions. [2021-02-19 20:36:07,407 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:07,407 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 350 transitions. [2021-02-19 20:36:07,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-02-19 20:36:07,410 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:07,410 INFO L506 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:07,623 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-02-19 20:36:07,624 INFO L428 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:07,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:07,624 INFO L82 PathProgramCache]: Analyzing trace with hash 593991300, now seen corresponding path program 14 times [2021-02-19 20:36:07,624 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:07,624 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416584488] [2021-02-19 20:36:07,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:07,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:07,884 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:07,884 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416584488] [2021-02-19 20:36:07,884 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767652637] [2021-02-19 20:36:07,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:07,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-02-19 20:36:07,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:36:07,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 37 conjunts are in the unsatisfiable core [2021-02-19 20:36:07,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:07,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2021-02-19 20:36:07,985 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 20:36:07,986 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 20:36:07,987 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 20:36:07,987 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2021-02-19 20:36:07,993 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:07,994 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:07,994 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 18 [2021-02-19 20:36:07,994 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019376284] [2021-02-19 20:36:07,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-02-19 20:36:07,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:07,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-02-19 20:36:07,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2021-02-19 20:36:07,995 INFO L87 Difference]: Start difference. First operand 168 states and 350 transitions. Second operand has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 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) [2021-02-19 20:36:08,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:08,507 INFO L93 Difference]: Finished difference Result 347 states and 667 transitions. [2021-02-19 20:36:08,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-02-19 20:36:08,508 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 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 [2021-02-19 20:36:08,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:08,509 INFO L225 Difference]: With dead ends: 347 [2021-02-19 20:36:08,509 INFO L226 Difference]: Without dead ends: 207 [2021-02-19 20:36:08,510 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=211, Invalid=979, Unknown=0, NotChecked=0, Total=1190 [2021-02-19 20:36:08,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2021-02-19 20:36:08,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 56. [2021-02-19 20:36:08,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.9272727272727272) internal successors, (106), 55 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:08,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 106 transitions. [2021-02-19 20:36:08,513 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 106 transitions. Word has length 25 [2021-02-19 20:36:08,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:08,513 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 106 transitions. [2021-02-19 20:36:08,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 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) [2021-02-19 20:36:08,513 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 106 transitions. [2021-02-19 20:36:08,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-19 20:36:08,513 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:08,513 INFO L506 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:08,736 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:08,736 INFO L428 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:08,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:08,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1234588569, now seen corresponding path program 15 times [2021-02-19 20:36:08,736 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:08,736 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2114537917] [2021-02-19 20:36:08,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:08,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:08,826 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:08,826 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2114537917] [2021-02-19 20:36:08,826 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616652168] [2021-02-19 20:36:08,826 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:08,868 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-02-19 20:36:08,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:36:08,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 18 conjunts are in the unsatisfiable core [2021-02-19 20:36:08,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:08,981 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:08,981 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:08,981 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 10 [2021-02-19 20:36:08,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287058183] [2021-02-19 20:36:08,982 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-02-19 20:36:08,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:08,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-02-19 20:36:08,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-02-19 20:36:08,983 INFO L87 Difference]: Start difference. First operand 56 states and 106 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:09,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:09,013 INFO L93 Difference]: Finished difference Result 274 states and 509 transitions. [2021-02-19 20:36:09,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-19 20:36:09,014 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-02-19 20:36:09,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:09,016 INFO L225 Difference]: With dead ends: 274 [2021-02-19 20:36:09,016 INFO L226 Difference]: Without dead ends: 255 [2021-02-19 20:36:09,017 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-02-19 20:36:09,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-02-19 20:36:09,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 201. [2021-02-19 20:36:09,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 2.095) internal successors, (419), 200 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:09,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 419 transitions. [2021-02-19 20:36:09,024 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 419 transitions. Word has length 26 [2021-02-19 20:36:09,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:09,024 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 419 transitions. [2021-02-19 20:36:09,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:09,025 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 419 transitions. [2021-02-19 20:36:09,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-02-19 20:36:09,026 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:09,026 INFO L506 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:09,238 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-02-19 20:36:09,238 INFO L428 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:09,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:09,238 INFO L82 PathProgramCache]: Analyzing trace with hash 768766754, now seen corresponding path program 16 times [2021-02-19 20:36:09,238 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:09,238 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710377075] [2021-02-19 20:36:09,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:09,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:09,514 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:09,514 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710377075] [2021-02-19 20:36:09,514 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697734707] [2021-02-19 20:36:09,514 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:09,538 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-02-19 20:36:09,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:36:09,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 39 conjunts are in the unsatisfiable core [2021-02-19 20:36:09,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:09,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2021-02-19 20:36:09,637 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 20:36:09,639 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 20:36:09,640 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 20:36:09,640 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:11, output treesize:3 [2021-02-19 20:36:09,647 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:09,648 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:09,648 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 20 [2021-02-19 20:36:09,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878081109] [2021-02-19 20:36:09,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-02-19 20:36:09,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:09,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-02-19 20:36:09,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2021-02-19 20:36:09,649 INFO L87 Difference]: Start difference. First operand 201 states and 419 transitions. Second operand has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:10,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:10,306 INFO L93 Difference]: Finished difference Result 415 states and 801 transitions. [2021-02-19 20:36:10,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-02-19 20:36:10,307 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-02-19 20:36:10,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:10,308 INFO L225 Difference]: With dead ends: 415 [2021-02-19 20:36:10,308 INFO L226 Difference]: Without dead ends: 249 [2021-02-19 20:36:10,308 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=255, Invalid=1227, Unknown=0, NotChecked=0, Total=1482 [2021-02-19 20:36:10,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2021-02-19 20:36:10,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 61. [2021-02-19 20:36:10,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.9333333333333333) internal successors, (116), 60 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:10,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 116 transitions. [2021-02-19 20:36:10,312 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 116 transitions. Word has length 27 [2021-02-19 20:36:10,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:10,312 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 116 transitions. [2021-02-19 20:36:10,312 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 20 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:10,312 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 116 transitions. [2021-02-19 20:36:10,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-02-19 20:36:10,313 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:10,313 INFO L506 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:10,530 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-02-19 20:36:10,530 INFO L428 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:10,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:10,530 INFO L82 PathProgramCache]: Analyzing trace with hash -1937306949, now seen corresponding path program 17 times [2021-02-19 20:36:10,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:10,530 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252042721] [2021-02-19 20:36:10,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:10,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:10,642 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:10,642 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252042721] [2021-02-19 20:36:10,642 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883354939] [2021-02-19 20:36:10,643 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:10,692 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-02-19 20:36:10,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:36:10,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 20 conjunts are in the unsatisfiable core [2021-02-19 20:36:10,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:10,791 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:10,791 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:10,791 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-02-19 20:36:10,792 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413239521] [2021-02-19 20:36:10,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-19 20:36:10,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:10,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-19 20:36:10,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-02-19 20:36:10,794 INFO L87 Difference]: Start difference. First operand 61 states and 116 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:10,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-19 20:36:10,827 INFO L93 Difference]: Finished difference Result 318 states and 594 transitions. [2021-02-19 20:36:10,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-02-19 20:36:10,828 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have 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 [2021-02-19 20:36:10,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-19 20:36:10,829 INFO L225 Difference]: With dead ends: 318 [2021-02-19 20:36:10,829 INFO L226 Difference]: Without dead ends: 297 [2021-02-19 20:36:10,829 INFO L762 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-02-19 20:36:10,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-02-19 20:36:10,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 237. [2021-02-19 20:36:10,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 2.093220338983051) internal successors, (494), 236 states have internal predecessors, (494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:10,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 494 transitions. [2021-02-19 20:36:10,836 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 494 transitions. Word has length 28 [2021-02-19 20:36:10,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-19 20:36:10,837 INFO L480 AbstractCegarLoop]: Abstraction has 237 states and 494 transitions. [2021-02-19 20:36:10,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:10,837 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 494 transitions. [2021-02-19 20:36:10,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-02-19 20:36:10,838 INFO L498 BasicCegarLoop]: Found error trace [2021-02-19 20:36:10,838 INFO L506 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-19 20:36:11,050 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:11,050 INFO L428 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr1INUSE_VIOLATION, ULTIMATE.startErr0INUSE_VIOLATION, ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-02-19 20:36:11,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-19 20:36:11,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1379494916, now seen corresponding path program 18 times [2021-02-19 20:36:11,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-19 20:36:11,050 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235970589] [2021-02-19 20:36:11,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-19 20:36:11,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-19 20:36:11,443 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:11,443 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235970589] [2021-02-19 20:36:11,443 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449438683] [2021-02-19 20:36:11,443 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:36:11,482 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-02-19 20:36:11,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-02-19 20:36:11,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 44 conjunts are in the unsatisfiable core [2021-02-19 20:36:11,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-02-19 20:36:52,618 INFO L354 Elim1Store]: treesize reduction 8, result has 27.3 percent of original size [2021-02-19 20:36:52,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 10 [2021-02-19 20:36:52,620 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-02-19 20:36:52,624 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-02-19 20:36:52,626 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-02-19 20:36:52,626 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:20, output treesize:3 [2021-02-19 20:36:52,632 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 6 proven. 65 refuted. 39 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-19 20:36:52,632 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-02-19 20:36:52,632 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 42 [2021-02-19 20:36:52,632 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760354539] [2021-02-19 20:36:52,632 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-02-19 20:36:52,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-19 20:36:52,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-02-19 20:36:52,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=1533, Unknown=39, NotChecked=0, Total=1806 [2021-02-19 20:36:52,634 INFO L87 Difference]: Start difference. First operand 237 states and 494 transitions. Second operand has 43 states, 43 states have (on average 1.255813953488372) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-02-19 20:36:59,545 WARN L202 SmtUtils]: Spent 6.55 s on a formula simplification. DAG size of input: 73 DAG size of output: 57 [2021-02-19 20:37:03,367 WARN L202 SmtUtils]: Spent 1.22 s on a formula simplification. DAG size of input: 64 DAG size of output: 40 [2021-02-19 20:37:04,063 WARN L202 SmtUtils]: Spent 475.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-02-19 20:37:06,855 WARN L202 SmtUtils]: Spent 2.60 s on a formula simplification. DAG size of input: 58 DAG size of output: 44 [2021-02-19 20:37:08,016 WARN L202 SmtUtils]: Spent 1.06 s on a formula simplification. DAG size of input: 56 DAG size of output: 41 [2021-02-19 20:37:12,142 WARN L202 SmtUtils]: Spent 4.06 s on a formula simplification. DAG size of input: 61 DAG size of output: 37 [2021-02-19 20:37:14,035 WARN L202 SmtUtils]: Spent 940.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 43 [2021-02-19 20:37:15,513 WARN L202 SmtUtils]: Spent 1.22 s on a formula simplification. DAG size of input: 55 DAG size of output: 40 [2021-02-19 20:37:16,449 WARN L202 SmtUtils]: Spent 857.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 37 [2021-02-19 20:37:25,732 WARN L202 SmtUtils]: Spent 9.23 s on a formula simplification. DAG size of input: 66 DAG size of output: 50 [2021-02-19 20:37:31,694 WARN L202 SmtUtils]: Spent 782.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2021-02-19 20:37:37,797 WARN L202 SmtUtils]: Spent 1.87 s on a formula simplification that was a NOOP. DAG size: 54 [2021-02-19 20:37:42,815 WARN L202 SmtUtils]: Spent 2.55 s on a formula simplification. DAG size of input: 53 DAG size of output: 46 [2021-02-19 20:37:45,946 WARN L202 SmtUtils]: Spent 1.57 s on a formula simplification. DAG size of input: 57 DAG size of output: 25 [2021-02-19 20:37:52,176 WARN L202 SmtUtils]: Spent 6.16 s on a formula simplification. DAG size of input: 72 DAG size of output: 39 [2021-02-19 20:38:12,837 WARN L202 SmtUtils]: Spent 4.66 s on a formula simplification. DAG size of input: 52 DAG size of output: 45 [2021-02-19 20:38:23,033 WARN L202 SmtUtils]: Spent 5.22 s on a formula simplification. DAG size of input: 57 DAG size of output: 41 [2021-02-19 20:38:32,865 WARN L202 SmtUtils]: Spent 6.84 s on a formula simplification. DAG size of input: 63 DAG size of output: 38 [2021-02-19 20:38:51,890 WARN L202 SmtUtils]: Spent 1.81 s on a formula simplification that was a NOOP. DAG size: 38 [2021-02-19 20:39:07,591 WARN L202 SmtUtils]: Spent 2.77 s on a formula simplification that was a NOOP. DAG size: 43 [2021-02-19 20:39:24,040 WARN L202 SmtUtils]: Spent 6.45 s on a formula simplification. DAG size of input: 50 DAG size of output: 43 [2021-02-19 20:39:31,708 WARN L202 SmtUtils]: Spent 5.15 s on a formula simplification that was a NOOP. DAG size: 49 [2021-02-19 20:39:47,985 WARN L202 SmtUtils]: Spent 7.71 s on a formula simplification. DAG size of input: 54 DAG size of output: 38 [2021-02-19 20:40:06,214 WARN L202 SmtUtils]: Spent 14.08 s on a formula simplification that was a NOOP. DAG size: 70 [2021-02-19 20:41:08,144 WARN L202 SmtUtils]: Spent 9.39 s on a formula simplification. DAG size of input: 49 DAG size of output: 33 [2021-02-19 20:41:26,245 WARN L202 SmtUtils]: Spent 8.03 s on a formula simplification that was a NOOP. DAG size: 54 [2021-02-19 20:41:43,348 WARN L202 SmtUtils]: Spent 10.07 s on a formula simplification that was a NOOP. DAG size: 61 [2021-02-19 20:42:21,014 WARN L202 SmtUtils]: Spent 1.64 s on a formula simplification that was a NOOP. DAG size: 34 [2021-02-19 20:42:46,482 WARN L202 SmtUtils]: Spent 3.90 s on a formula simplification that was a NOOP. DAG size: 40 [2021-02-19 20:43:16,994 WARN L202 SmtUtils]: Spent 5.52 s on a formula simplification that was a NOOP. DAG size: 47 [2021-02-19 20:43:36,049 WARN L202 SmtUtils]: Spent 4.02 s on a formula simplification that was a NOOP. DAG size: 39 [2021-02-19 20:43:56,407 WARN L202 SmtUtils]: Spent 5.57 s on a formula simplification that was a NOOP. DAG size: 46 [2021-02-19 20:44:17,801 WARN L202 SmtUtils]: Spent 11.20 s on a formula simplification. DAG size of input: 52 DAG size of output: 43 [2021-02-19 20:44:49,257 WARN L202 SmtUtils]: Spent 23.57 s on a formula simplification. DAG size of input: 68 DAG size of output: 59 [2021-02-19 20:45:19,684 WARN L202 SmtUtils]: Spent 2.02 s on a formula simplification that was a NOOP. DAG size: 31 Received shutdown request... [2021-02-19 20:45:26,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-02-19 20:45:26,980 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-02-19 20:45:26,980 WARN L545 AbstractCegarLoop]: Verification canceled [2021-02-19 20:45:26,983 WARN L224 ceAbstractionStarter]: Timeout [2021-02-19 20:45:26,984 INFO L202 PluginConnector]: Adding new model context1.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.02 08:45:26 BasicIcfg [2021-02-19 20:45:26,984 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-19 20:45:26,984 INFO L168 Benchmark]: Toolchain (without parser) took 588446.73 ms. Allocated memory was 255.9 MB in the beginning and 331.4 MB in the end (delta: 75.5 MB). Free memory was 236.7 MB in the beginning and 244.2 MB in the end (delta: -7.4 MB). Peak memory consumption was 70.2 MB. Max. memory is 16.0 GB. [2021-02-19 20:45:26,984 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.16 ms. Allocated memory is still 255.9 MB. Free memory is still 237.8 MB. There was no memory consumed. Max. memory is 16.0 GB. [2021-02-19 20:45:26,984 INFO L168 Benchmark]: Boogie Procedure Inliner took 28.31 ms. Allocated memory is still 255.9 MB. Free memory was 236.2 MB in the beginning and 234.9 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-02-19 20:45:26,984 INFO L168 Benchmark]: Boogie Preprocessor took 14.37 ms. Allocated memory is still 255.9 MB. Free memory was 234.7 MB in the beginning and 233.8 MB in the end (delta: 835.6 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-02-19 20:45:26,984 INFO L168 Benchmark]: RCFGBuilder took 325.48 ms. Allocated memory is still 255.9 MB. Free memory was 233.8 MB in the beginning and 239.1 MB in the end (delta: -5.3 MB). Peak memory consumption was 23.8 MB. Max. memory is 16.0 GB. [2021-02-19 20:45:26,984 INFO L168 Benchmark]: TraceAbstraction took 588071.54 ms. Allocated memory was 255.9 MB in the beginning and 331.4 MB in the end (delta: 75.5 MB). Free memory was 239.1 MB in the beginning and 244.2 MB in the end (delta: -5.1 MB). Peak memory consumption was 71.6 MB. Max. memory is 16.0 GB. [2021-02-19 20:45:26,985 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 0.16 ms. Allocated memory is still 255.9 MB. Free memory is still 237.8 MB. There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 28.31 ms. Allocated memory is still 255.9 MB. Free memory was 236.2 MB in the beginning and 234.9 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Preprocessor took 14.37 ms. Allocated memory is still 255.9 MB. Free memory was 234.7 MB in the beginning and 233.8 MB in the end (delta: 835.6 kB). There was no memory consumed. Max. memory is 16.0 GB. * RCFGBuilder took 325.48 ms. Allocated memory is still 255.9 MB. Free memory was 233.8 MB in the beginning and 239.1 MB in the end (delta: -5.3 MB). Peak memory consumption was 23.8 MB. Max. memory is 16.0 GB. * TraceAbstraction took 588071.54 ms. Allocated memory was 255.9 MB in the beginning and 331.4 MB in the end (delta: 75.5 MB). Free memory was 239.1 MB in the beginning and 244.2 MB in the end (delta: -5.1 MB). Peak memory consumption was 71.6 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 46]: Timeout (TraceAbstraction) Unable to prove that assertion always holds (line 46). Cancelled while BasicCegarLoop was constructing difference of abstraction (237states) and FLOYD_HOARE automaton (currently 82 states, 43 states before enhancement),while PredicateComparison was comparing new predicate (quantified with 0quantifier alternations) to 122 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 14 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: TIMEOUT, OverallTime: 587.9s, OverallIterations: 20, TraceHistogramMax: 10, AutomataDifference: 535.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 655 SDtfs, 2653 SDslu, 5349 SDs, 0 SdLazy, 1629 SolverSat, 763 SolverUnsat, 22 SolverUnknown, 0 SolverNotchecked, 37.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 765 GetRequests, 368 SyntacticMatches, 18 SemanticMatches, 378 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4695 ImplicationChecksByTransitivity, 539.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=237occurred in iteration=19, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 19 MinimizatonAttempts, 1024 StatesRemovedByMinimization, 16 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 47.2s InterpolantComputationTime, 747 NumberOfCodeBlocks, 747 NumberOfCodeBlocksAsserted, 72 NumberOfCheckSat, 709 ConstructedInterpolants, 19 QuantifiedInterpolants, 68019 SizeOfPredicates, 11 NumberOfNonLiveVariables, 1519 ConjunctsInSsa, 354 ConjunctsInUnsatCore, 38 InterpolantComputations, 2 PerfectInterpolantSequences, 427/1617 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown