/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/recHanoi03-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 15:45:32,625 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 15:45:32,666 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 15:45:32,667 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 15:45:32,668 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 15:45:32,671 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 15:45:32,672 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 15:45:32,672 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 15:45:32,677 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 15:45:32,680 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 15:45:32,683 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 15:45:32,686 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 15:45:32,687 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 15:45:32,687 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 15:45:32,692 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 15:45:32,708 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 15:45:32,730 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 15:45:32,731 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 15:45:32,733 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 15:45:32,733 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 15:45:32,733 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 15:45:32,734 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 15:45:32,734 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 15:45:32,734 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 15:45:32,734 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 15:45:32,734 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 15:45:32,736 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 15:45:32,736 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 15:45:32,736 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 15:45:32,736 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 15:45:32,737 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 15:45:32,737 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 15:45:32,737 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 15:45:32,737 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 15:45:32,737 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 15:45:32,738 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 15:45:32,738 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 15:45:32,738 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:45:32,738 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 15:45:32,738 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 15:45:32,739 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 15:45:32,739 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 15:45:32,739 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:32,739 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 15:45:32,739 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 15:45:32,739 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 15:45:33,040 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 15:45:33,058 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 15:45:33,062 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 15:45:33,063 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 15:45:33,066 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 15:45:33,067 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/recHanoi03-2.c [2020-07-21 15:45:33,146 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63254cd90/a05c079305c84942a1c27bc8eeaea603/FLAG096474557 [2020-07-21 15:45:33,609 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 15:45:33,610 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/recHanoi03-2.c [2020-07-21 15:45:33,615 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63254cd90/a05c079305c84942a1c27bc8eeaea603/FLAG096474557 [2020-07-21 15:45:33,986 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/63254cd90/a05c079305c84942a1c27bc8eeaea603 [2020-07-21 15:45:33,995 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 15:45:33,998 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 15:45:33,999 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 15:45:34,000 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 15:45:34,003 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 15:45:34,004 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:45:33" (1/1) ... [2020-07-21 15:45:34,007 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ef71943 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:34, skipping insertion in model container [2020-07-21 15:45:34,007 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:45:33" (1/1) ... [2020-07-21 15:45:34,015 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 15:45:34,035 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 15:45:34,219 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:45:34,224 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 15:45:34,240 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:45:34,255 INFO L208 MainTranslator]: Completed translation [2020-07-21 15:45:34,255 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:34 WrapperNode [2020-07-21 15:45:34,256 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 15:45:34,256 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 15:45:34,257 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 15:45:34,257 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 15:45:34,271 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:34" (1/1) ... [2020-07-21 15:45:34,271 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:34" (1/1) ... [2020-07-21 15:45:34,276 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:34" (1/1) ... [2020-07-21 15:45:34,277 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:34" (1/1) ... [2020-07-21 15:45:34,280 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:34" (1/1) ... [2020-07-21 15:45:34,282 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:34" (1/1) ... [2020-07-21 15:45:34,283 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:34" (1/1) ... [2020-07-21 15:45:34,285 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 15:45:34,285 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 15:45:34,285 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 15:45:34,286 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 15:45:34,287 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:34" (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 [2020-07-21 15:45:34,431 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 15:45:34,431 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 15:45:34,431 INFO L138 BoogieDeclarations]: Found implementation of procedure hanoi [2020-07-21 15:45:34,431 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 15:45:34,431 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 15:45:34,432 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 15:45:34,432 INFO L130 BoogieDeclarations]: Found specification of procedure hanoi [2020-07-21 15:45:34,432 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 15:45:34,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 15:45:34,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 15:45:34,608 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 15:45:34,609 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 15:45:34,612 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:45:34 BoogieIcfgContainer [2020-07-21 15:45:34,612 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 15:45:34,614 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 15:45:34,614 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 15:45:34,617 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 15:45:34,618 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 03:45:33" (1/3) ... [2020-07-21 15:45:34,619 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29fc1328 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:45:34, skipping insertion in model container [2020-07-21 15:45:34,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:34" (2/3) ... [2020-07-21 15:45:34,619 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29fc1328 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:45:34, skipping insertion in model container [2020-07-21 15:45:34,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:45:34" (3/3) ... [2020-07-21 15:45:34,621 INFO L109 eAbstractionObserver]: Analyzing ICFG recHanoi03-2.c [2020-07-21 15:45:34,632 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 15:45:34,640 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 15:45:34,656 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 15:45:34,683 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 15:45:34,683 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 15:45:34,683 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 15:45:34,683 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 15:45:34,683 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 15:45:34,684 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 15:45:34,684 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 15:45:34,684 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 15:45:34,703 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-21 15:45:34,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 15:45:34,709 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:34,710 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:34,710 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:34,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:34,716 INFO L82 PathProgramCache]: Analyzing trace with hash 913793727, now seen corresponding path program 1 times [2020-07-21 15:45:34,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:34,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268022975] [2020-07-21 15:45:34,724 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:34,788 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:45:34,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:34,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 15:45:34,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:34,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:45:34,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:45:34,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268022975] [2020-07-21 15:45:34,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:45:34,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 15:45:34,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604656861] [2020-07-21 15:45:34,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 15:45:34,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:34,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 15:45:34,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:45:34,963 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 6 states. [2020-07-21 15:45:35,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:35,095 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-07-21 15:45:35,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 15:45:35,097 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-21 15:45:35,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:35,108 INFO L225 Difference]: With dead ends: 33 [2020-07-21 15:45:35,109 INFO L226 Difference]: Without dead ends: 19 [2020-07-21 15:45:35,113 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-21 15:45:35,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-21 15:45:35,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-21 15:45:35,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-21 15:45:35,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-07-21 15:45:35,162 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2020-07-21 15:45:35,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:35,162 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-07-21 15:45:35,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 15:45:35,163 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-07-21 15:45:35,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 15:45:35,165 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:35,165 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:35,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:35,372 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:35,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:35,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1998834103, now seen corresponding path program 1 times [2020-07-21 15:45:35,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:35,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861637959] [2020-07-21 15:45:35,376 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:35,425 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:35,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:35,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 15:45:35,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:35,599 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 15:45:35,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:35,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:35,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:59,943 WARN L193 SmtUtils]: Spent 7.53 s on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 15:46:17,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:46:18,768 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:46:18,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [861637959] [2020-07-21 15:46:18,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:46:18,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2020-07-21 15:46:18,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893512254] [2020-07-21 15:46:18,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 15:46:18,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:18,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 15:46:18,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=163, Unknown=8, NotChecked=0, Total=210 [2020-07-21 15:46:18,775 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 15 states. [2020-07-21 15:46:23,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:23,229 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2020-07-21 15:46:23,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 15:46:23,231 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 20 [2020-07-21 15:46:23,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:23,233 INFO L225 Difference]: With dead ends: 31 [2020-07-21 15:46:23,234 INFO L226 Difference]: Without dead ends: 25 [2020-07-21 15:46:23,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 47.1s TimeCoverageRelationStatistics Valid=76, Invalid=294, Unknown=10, NotChecked=0, Total=380 [2020-07-21 15:46:23,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-21 15:46:23,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-07-21 15:46:23,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 15:46:23,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-07-21 15:46:23,242 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2020-07-21 15:46:23,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:23,243 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-07-21 15:46:23,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 15:46:23,243 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-07-21 15:46:23,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-21 15:46:23,245 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:23,245 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:23,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:23,459 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:23,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:23,461 INFO L82 PathProgramCache]: Analyzing trace with hash -547108535, now seen corresponding path program 2 times [2020-07-21 15:46:23,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:23,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352555144] [2020-07-21 15:46:23,463 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:23,492 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:46:23,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:23,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 15:46:23,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:32,055 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-21 15:46:32,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:33,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352555144] [2020-07-21 15:46:33,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:46:33,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-21 15:46:33,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354740648] [2020-07-21 15:46:33,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:46:33,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:33,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:46:33,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=220, Unknown=4, NotChecked=0, Total=272 [2020-07-21 15:46:33,585 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 12 states. [2020-07-21 15:46:39,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:39,025 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2020-07-21 15:46:39,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 15:46:39,028 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-07-21 15:46:39,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:39,029 INFO L225 Difference]: With dead ends: 32 [2020-07-21 15:46:39,030 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 15:46:39,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=90, Invalid=457, Unknown=5, NotChecked=0, Total=552 [2020-07-21 15:46:39,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 15:46:39,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 15:46:39,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 15:46:39,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-07-21 15:46:39,051 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 32 [2020-07-21 15:46:39,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:39,051 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-07-21 15:46:39,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:46:39,052 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-07-21 15:46:39,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-21 15:46:39,054 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:39,054 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:39,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:39,268 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:39,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:39,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1152432193, now seen corresponding path program 3 times [2020-07-21 15:46:39,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:39,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [644367989] [2020-07-21 15:46:39,271 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:39,307 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:46:39,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:39,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 15:46:39,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:47:02,593 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 15:47:02,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:47:03,529 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:47:03,736 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:47:03,846 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:47:03,972 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:47:04,091 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:47:05,108 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:47:05,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [644367989] [2020-07-21 15:47:05,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:47:05,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-21 15:47:05,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285831860] [2020-07-21 15:47:05,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:47:05,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:47:05,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:47:05,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=275, Unknown=11, NotChecked=0, Total=342 [2020-07-21 15:47:05,360 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 14 states. [2020-07-21 15:47:52,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:47:52,944 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2020-07-21 15:47:52,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 15:47:52,953 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 38 [2020-07-21 15:47:52,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:47:52,955 INFO L225 Difference]: With dead ends: 35 [2020-07-21 15:47:52,955 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 15:47:52,956 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 51.0s TimeCoverageRelationStatistics Valid=110, Invalid=627, Unknown=19, NotChecked=0, Total=756 [2020-07-21 15:47:52,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 15:47:52,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-21 15:47:52,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 15:47:52,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-07-21 15:47:52,963 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 38 [2020-07-21 15:47:52,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:47:52,964 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-07-21 15:47:52,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:47:52,964 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-07-21 15:47:52,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-21 15:47:52,966 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:47:52,966 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:47:53,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:47:53,169 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:47:53,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:47:53,170 INFO L82 PathProgramCache]: Analyzing trace with hash 1461718089, now seen corresponding path program 4 times [2020-07-21 15:47:53,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:47:53,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709479805] [2020-07-21 15:47:53,172 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:47:53,232 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:47:53,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:47:53,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 15:47:53,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:49:01,068 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 15:49:01,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:49:01,980 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 15:49:02,189 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:49:02,303 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:49:02,430 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 15:49:02,555 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 15:49:02,697 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:49:02,846 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:49:03,017 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:49:03,187 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:49:03,369 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:49:03,549 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:49:03,753 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:49:03,948 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:49:04,168 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:49:04,384 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:49:05,462 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:49:05,569 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:49:05,698 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 15:49:05,821 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 15:49:05,961 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:49:06,103 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:49:06,268 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:49:06,423 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:49:06,637 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:49:06,831 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:49:06,959 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:49:07,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709479805] [2020-07-21 15:49:07,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:49:07,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-07-21 15:49:07,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215162974] [2020-07-21 15:49:07,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:49:07,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:49:07,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:49:07,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=325, Unknown=31, NotChecked=0, Total=420 [2020-07-21 15:49:07,245 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 16 states. [2020-07-21 15:51:39,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:39,578 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2020-07-21 15:51:39,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 15:51:39,595 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 44 [2020-07-21 15:51:39,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:39,597 INFO L225 Difference]: With dead ends: 38 [2020-07-21 15:51:39,597 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 15:51:39,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 154.9s TimeCoverageRelationStatistics Valid=130, Invalid=807, Unknown=55, NotChecked=0, Total=992 [2020-07-21 15:51:39,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 15:51:39,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-07-21 15:51:39,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 15:51:39,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-07-21 15:51:39,607 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 44 [2020-07-21 15:51:39,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:39,608 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-07-21 15:51:39,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:51:39,608 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-07-21 15:51:39,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-07-21 15:51:39,610 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:39,610 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:39,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:39,814 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:39,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:39,815 INFO L82 PathProgramCache]: Analyzing trace with hash -269168065, now seen corresponding path program 5 times [2020-07-21 15:51:39,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:39,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335047011] [2020-07-21 15:51:39,816 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:39,915 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:51:39,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:39,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-21 15:51:39,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:53:37,308 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 15:53:37,373 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-21 15:53:37,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:53:38,497 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 15:53:38,632 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 15:53:38,814 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-21 15:53:38,992 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-21 15:53:39,218 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 15:53:39,444 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 15:53:39,705 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 15:53:39,972 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 15:53:40,282 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:53:40,593 WARN L193 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:53:40,943 WARN L193 SmtUtils]: Spent 341.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 15:53:41,301 WARN L193 SmtUtils]: Spent 350.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 15:53:41,684 WARN L193 SmtUtils]: Spent 375.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:53:42,107 WARN L193 SmtUtils]: Spent 416.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:53:42,526 WARN L193 SmtUtils]: Spent 410.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:53:42,825 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:53:43,171 WARN L193 SmtUtils]: Spent 340.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:53:43,529 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:53:44,067 WARN L193 SmtUtils]: Spent 528.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:53:44,617 WARN L193 SmtUtils]: Spent 542.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:53:45,199 WARN L193 SmtUtils]: Spent 573.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 15:53:45,784 WARN L193 SmtUtils]: Spent 577.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 15:53:46,446 WARN L193 SmtUtils]: Spent 650.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 15:53:47,090 WARN L193 SmtUtils]: Spent 636.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 15:53:47,782 WARN L193 SmtUtils]: Spent 684.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 15:53:48,464 WARN L193 SmtUtils]: Spent 673.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-21 15:53:49,627 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 15:53:49,760 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 15:53:49,925 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-21 15:53:50,087 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-21 15:53:50,294 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 15:53:50,507 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-21 15:53:50,763 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 15:53:51,010 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 15:53:51,320 WARN L193 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:53:51,617 WARN L193 SmtUtils]: Spent 289.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:53:51,961 WARN L193 SmtUtils]: Spent 335.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 15:53:52,322 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 15:53:52,711 WARN L193 SmtUtils]: Spent 380.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:53:53,087 WARN L193 SmtUtils]: Spent 368.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:53:53,554 WARN L193 SmtUtils]: Spent 456.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:53:54,016 WARN L193 SmtUtils]: Spent 454.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:53:54,497 WARN L193 SmtUtils]: Spent 472.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:53:54,981 WARN L193 SmtUtils]: Spent 478.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:53:55,517 WARN L193 SmtUtils]: Spent 526.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:53:56,052 WARN L193 SmtUtils]: Spent 528.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:53:56,637 WARN L193 SmtUtils]: Spent 577.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 15:53:57,193 WARN L193 SmtUtils]: Spent 549.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 15:53:57,599 WARN L193 SmtUtils]: Spent 393.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:53:57,962 WARN L193 SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 15:53:58,310 WARN L193 SmtUtils]: Spent 340.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:53:58,550 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 15:53:58,731 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 15:53:58,903 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:53:59,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335047011] [2020-07-21 15:53:59,364 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:53:59,364 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-07-21 15:53:59,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501958305] [2020-07-21 15:53:59,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:53:59,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:53:59,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:53:59,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=387, Unknown=47, NotChecked=0, Total=506 [2020-07-21 15:53:59,366 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 18 states. [2020-07-21 15:55:01,173 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-21 15:55:38,369 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 15:56:10,394 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-21 15:57:32,057 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-21 15:57:54,067 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-21 15:58:07,571 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-21 15:58:50,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:58:50,731 INFO L93 Difference]: Finished difference Result 41 states and 42 transitions. [2020-07-21 15:58:50,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 15:58:50,748 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-07-21 15:58:50,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:58:50,750 INFO L225 Difference]: With dead ends: 41 [2020-07-21 15:58:50,750 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 15:58:50,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 268.6s TimeCoverageRelationStatistics Valid=150, Invalid=1023, Unknown=87, NotChecked=0, Total=1260 [2020-07-21 15:58:50,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 15:58:50,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-21 15:58:50,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-21 15:58:50,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-07-21 15:58:50,759 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 50 [2020-07-21 15:58:50,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:58:50,760 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-07-21 15:58:50,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:58:50,760 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-07-21 15:58:50,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 15:58:50,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:58:50,761 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:58:50,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:58:50,977 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:58:50,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:58:50,978 INFO L82 PathProgramCache]: Analyzing trace with hash 585432905, now seen corresponding path program 6 times [2020-07-21 15:58:50,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:58:50,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1494264979] [2020-07-21 15:58:50,980 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:58:51,080 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:58:51,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:58:51,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 15:58:51,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:00,262 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 33