/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/eca-rers2012/Problem18_label16.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 21:21:45,478 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 21:21:45,484 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 21:21:45,500 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-23 21:21:45,537 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 [2019-11-23 21:21:45,559 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 21:21:45,559 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 21:21:45,562 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-23 21:21:45,562 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-23 21:21:45,562 INFO L138 SettingsManager]: * Use SBE=true [2019-11-23 21:21:45,562 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 21:21:45,562 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 21:21:45,563 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 21:21:45,563 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 21:21:45,563 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 21:21:45,564 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 21:21:45,564 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 21:21:45,565 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 21:21:45,565 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-23 21:21:45,565 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 21:21:45,565 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 21:21:45,566 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-23 21:21:45,566 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 21:21:45,566 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 21:21:45,566 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-23 21:21:45,567 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 21:21:45,567 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 21:21:45,567 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 21:21:45,567 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 21:21:45,568 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 21:21:45,568 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 21:21:45,568 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-23 21:21:45,568 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 21:21:45,568 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 21:21:45,568 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 21:21:45,841 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 21:21:45,853 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 21:21:45,856 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 21:21:45,858 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 21:21:45,858 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 21:21:45,859 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem18_label16.c [2019-11-23 21:21:45,923 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2be974f17/27be2cfeec2e4076924e911481741243/FLAGb407d8255 [2019-11-23 21:21:46,655 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 21:21:46,656 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem18_label16.c [2019-11-23 21:21:46,680 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2be974f17/27be2cfeec2e4076924e911481741243/FLAGb407d8255 [2019-11-23 21:21:46,791 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2be974f17/27be2cfeec2e4076924e911481741243 [2019-11-23 21:21:46,801 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 21:21:46,803 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 21:21:46,804 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 21:21:46,804 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 21:21:46,807 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 21:21:46,808 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:21:46" (1/1) ... [2019-11-23 21:21:46,811 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@67eb3e94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:46, skipping insertion in model container [2019-11-23 21:21:46,812 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:21:46" (1/1) ... [2019-11-23 21:21:46,819 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 21:21:46,941 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 21:21:48,047 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 21:21:48,054 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 21:21:48,460 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 21:21:48,487 INFO L208 MainTranslator]: Completed translation [2019-11-23 21:21:48,488 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48 WrapperNode [2019-11-23 21:21:48,489 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 21:21:48,490 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 21:21:48,490 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 21:21:48,490 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 21:21:48,499 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48" (1/1) ... [2019-11-23 21:21:48,548 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48" (1/1) ... [2019-11-23 21:21:48,840 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 21:21:48,840 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 21:21:48,840 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 21:21:48,840 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 21:21:48,855 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48" (1/1) ... [2019-11-23 21:21:48,856 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48" (1/1) ... [2019-11-23 21:21:48,881 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48" (1/1) ... [2019-11-23 21:21:48,881 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48" (1/1) ... [2019-11-23 21:21:48,960 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48" (1/1) ... [2019-11-23 21:21:48,997 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48" (1/1) ... [2019-11-23 21:21:49,027 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48" (1/1) ... [2019-11-23 21:21:49,051 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 21:21:49,052 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 21:21:49,052 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 21:21:49,052 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 21:21:49,053 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48" (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 [2019-11-23 21:21:49,131 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 21:21:49,131 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 21:21:52,996 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 21:21:52,997 INFO L284 CfgBuilder]: Removed 11 assume(true) statements. [2019-11-23 21:21:53,000 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:21:52 BoogieIcfgContainer [2019-11-23 21:21:53,002 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 21:21:53,003 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 21:21:53,003 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 21:21:53,010 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 21:21:53,014 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:21:46" (1/3) ... [2019-11-23 21:21:53,015 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51bf5449 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:21:53, skipping insertion in model container [2019-11-23 21:21:53,016 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:21:48" (2/3) ... [2019-11-23 21:21:53,017 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51bf5449 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:21:53, skipping insertion in model container [2019-11-23 21:21:53,018 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:21:52" (3/3) ... [2019-11-23 21:21:53,020 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem18_label16.c [2019-11-23 21:21:53,031 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 21:21:53,043 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 21:21:53,057 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 21:21:53,119 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 21:21:53,120 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 21:21:53,120 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 21:21:53,120 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 21:21:53,120 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 21:21:53,121 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 21:21:53,121 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 21:21:53,122 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 21:21:53,161 INFO L276 IsEmpty]: Start isEmpty. Operand 757 states. [2019-11-23 21:21:53,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-23 21:21:53,173 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 21:21:53,175 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 21:21:53,175 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 21:21:53,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 21:21:53,183 INFO L82 PathProgramCache]: Analyzing trace with hash 291089130, now seen corresponding path program 1 times [2019-11-23 21:21:53,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 21:21:53,193 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903840173] [2019-11-23 21:21:53,193 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 21:21:53,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:21:53,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 21:21:53,588 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903840173] [2019-11-23 21:21:53,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 21:21:53,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 21:21:53,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874736728] [2019-11-23 21:21:53,596 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 21:21:53,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 21:21:53,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 21:21:53,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 21:21:53,615 INFO L87 Difference]: Start difference. First operand 757 states. Second operand 4 states. [2019-11-23 21:22:00,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 21:22:00,809 INFO L93 Difference]: Finished difference Result 2898 states and 5646 transitions. [2019-11-23 21:22:00,809 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 21:22:00,811 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 46 [2019-11-23 21:22:00,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 21:22:00,858 INFO L225 Difference]: With dead ends: 2898 [2019-11-23 21:22:00,858 INFO L226 Difference]: Without dead ends: 2074 [2019-11-23 21:22:00,871 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 21:22:00,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2074 states. [2019-11-23 21:22:01,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2074 to 2074. [2019-11-23 21:22:01,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2074 states. [2019-11-23 21:22:01,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2074 states to 2074 states and 3550 transitions. [2019-11-23 21:22:01,016 INFO L78 Accepts]: Start accepts. Automaton has 2074 states and 3550 transitions. Word has length 46 [2019-11-23 21:22:01,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 21:22:01,016 INFO L462 AbstractCegarLoop]: Abstraction has 2074 states and 3550 transitions. [2019-11-23 21:22:01,017 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 21:22:01,017 INFO L276 IsEmpty]: Start isEmpty. Operand 2074 states and 3550 transitions. [2019-11-23 21:22:01,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-11-23 21:22:01,021 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 21:22:01,022 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 21:22:01,022 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 21:22:01,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 21:22:01,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1807365488, now seen corresponding path program 1 times [2019-11-23 21:22:01,023 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 21:22:01,023 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455577384] [2019-11-23 21:22:01,023 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 21:22:01,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:01,247 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 21:22:01,247 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455577384] [2019-11-23 21:22:01,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 21:22:01,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 21:22:01,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083925442] [2019-11-23 21:22:01,249 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 21:22:01,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 21:22:01,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 21:22:01,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-23 21:22:01,250 INFO L87 Difference]: Start difference. First operand 2074 states and 3550 transitions. Second operand 4 states. [2019-11-23 21:22:07,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 21:22:07,152 INFO L93 Difference]: Finished difference Result 6912 states and 11605 transitions. [2019-11-23 21:22:07,153 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-23 21:22:07,153 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 115 [2019-11-23 21:22:07,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 21:22:07,179 INFO L225 Difference]: With dead ends: 6912 [2019-11-23 21:22:07,179 INFO L226 Difference]: Without dead ends: 4840 [2019-11-23 21:22:07,184 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 1 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-23 21:22:07,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4840 states. [2019-11-23 21:22:07,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4840 to 4834. [2019-11-23 21:22:07,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4834 states. [2019-11-23 21:22:07,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4834 states to 4834 states and 7547 transitions. [2019-11-23 21:22:07,267 INFO L78 Accepts]: Start accepts. Automaton has 4834 states and 7547 transitions. Word has length 115 [2019-11-23 21:22:07,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 21:22:07,268 INFO L462 AbstractCegarLoop]: Abstraction has 4834 states and 7547 transitions. [2019-11-23 21:22:07,268 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 21:22:07,268 INFO L276 IsEmpty]: Start isEmpty. Operand 4834 states and 7547 transitions. [2019-11-23 21:22:07,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2019-11-23 21:22:07,271 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 21:22:07,271 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 21:22:07,272 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 21:22:07,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 21:22:07,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1481651601, now seen corresponding path program 1 times [2019-11-23 21:22:07,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 21:22:07,273 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505838091] [2019-11-23 21:22:07,273 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 21:22:07,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:07,715 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 43 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 21:22:07,716 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505838091] [2019-11-23 21:22:07,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 21:22:07,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-23 21:22:07,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921533721] [2019-11-23 21:22:07,719 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-23 21:22:07,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 21:22:07,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-23 21:22:07,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-23 21:22:07,721 INFO L87 Difference]: Start difference. First operand 4834 states and 7547 transitions. Second operand 5 states. [2019-11-23 21:22:13,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 21:22:13,628 INFO L93 Difference]: Finished difference Result 13806 states and 21472 transitions. [2019-11-23 21:22:13,632 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 21:22:13,632 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 164 [2019-11-23 21:22:13,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 21:22:13,672 INFO L225 Difference]: With dead ends: 13806 [2019-11-23 21:22:13,672 INFO L226 Difference]: Without dead ends: 8974 [2019-11-23 21:22:13,679 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:13,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8974 states. [2019-11-23 21:22:13,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8974 to 8284. [2019-11-23 21:22:13,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8284 states. [2019-11-23 21:22:13,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8284 states to 8284 states and 11321 transitions. [2019-11-23 21:22:13,829 INFO L78 Accepts]: Start accepts. Automaton has 8284 states and 11321 transitions. Word has length 164 [2019-11-23 21:22:13,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 21:22:13,829 INFO L462 AbstractCegarLoop]: Abstraction has 8284 states and 11321 transitions. [2019-11-23 21:22:13,830 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-23 21:22:13,830 INFO L276 IsEmpty]: Start isEmpty. Operand 8284 states and 11321 transitions. [2019-11-23 21:22:13,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2019-11-23 21:22:13,833 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 21:22:13,834 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 21:22:13,834 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 21:22:13,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 21:22:13,834 INFO L82 PathProgramCache]: Analyzing trace with hash -535258005, now seen corresponding path program 1 times [2019-11-23 21:22:13,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 21:22:13,835 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [722705132] [2019-11-23 21:22:13,835 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 21:22:13,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:14,321 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 155 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 21:22:14,322 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [722705132] [2019-11-23 21:22:14,322 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422943218] [2019-11-23 21:22:14,322 INFO L94 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 [2019-11-23 21:22:14,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:14,475 INFO L255 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-23 21:22:14,489 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 21:22:14,662 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 158 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 21:22:14,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-23 21:22:14,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2019-11-23 21:22:14,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518213460] [2019-11-23 21:22:14,664 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 21:22:14,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 21:22:14,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 21:22:14,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:14,665 INFO L87 Difference]: Start difference. First operand 8284 states and 11321 transitions. Second operand 3 states. [2019-11-23 21:22:18,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 21:22:18,542 INFO L93 Difference]: Finished difference Result 20706 states and 29097 transitions. [2019-11-23 21:22:18,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 21:22:18,543 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 300 [2019-11-23 21:22:18,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 21:22:18,591 INFO L225 Difference]: With dead ends: 20706 [2019-11-23 21:22:18,591 INFO L226 Difference]: Without dead ends: 13114 [2019-11-23 21:22:18,600 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 299 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:18,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13114 states. [2019-11-23 21:22:18,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13114 to 12424. [2019-11-23 21:22:18,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12424 states. [2019-11-23 21:22:18,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12424 states to 12424 states and 16157 transitions. [2019-11-23 21:22:18,831 INFO L78 Accepts]: Start accepts. Automaton has 12424 states and 16157 transitions. Word has length 300 [2019-11-23 21:22:18,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 21:22:18,832 INFO L462 AbstractCegarLoop]: Abstraction has 12424 states and 16157 transitions. [2019-11-23 21:22:18,832 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 21:22:18,832 INFO L276 IsEmpty]: Start isEmpty. Operand 12424 states and 16157 transitions. [2019-11-23 21:22:18,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2019-11-23 21:22:18,840 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 21:22:18,840 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 21:22:19,045 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 21:22:19,045 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 21:22:19,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 21:22:19,045 INFO L82 PathProgramCache]: Analyzing trace with hash -228380227, now seen corresponding path program 1 times [2019-11-23 21:22:19,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 21:22:19,046 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075509970] [2019-11-23 21:22:19,046 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 21:22:19,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:19,575 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 199 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 21:22:19,576 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075509970] [2019-11-23 21:22:19,576 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414195656] [2019-11-23 21:22:19,577 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 21:22:19,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:19,683 INFO L255 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-23 21:22:19,691 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 21:22:19,802 INFO L134 CoverageAnalysis]: Checked inductivity of 202 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2019-11-23 21:22:19,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-23 21:22:19,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2019-11-23 21:22:19,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588433995] [2019-11-23 21:22:19,803 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 21:22:19,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 21:22:19,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 21:22:19,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:19,804 INFO L87 Difference]: Start difference. First operand 12424 states and 16157 transitions. Second operand 3 states. [2019-11-23 21:22:23,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 21:22:23,319 INFO L93 Difference]: Finished difference Result 32436 states and 43282 transitions. [2019-11-23 21:22:23,319 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 21:22:23,320 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 344 [2019-11-23 21:22:23,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 21:22:23,361 INFO L225 Difference]: With dead ends: 32436 [2019-11-23 21:22:23,361 INFO L226 Difference]: Without dead ends: 20704 [2019-11-23 21:22:23,376 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 348 GetRequests, 343 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:23,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20704 states. [2019-11-23 21:22:23,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20704 to 17944. [2019-11-23 21:22:23,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17944 states. [2019-11-23 21:22:23,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17944 states to 17944 states and 22080 transitions. [2019-11-23 21:22:23,740 INFO L78 Accepts]: Start accepts. Automaton has 17944 states and 22080 transitions. Word has length 344 [2019-11-23 21:22:23,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 21:22:23,741 INFO L462 AbstractCegarLoop]: Abstraction has 17944 states and 22080 transitions. [2019-11-23 21:22:23,741 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 21:22:23,741 INFO L276 IsEmpty]: Start isEmpty. Operand 17944 states and 22080 transitions. [2019-11-23 21:22:23,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 463 [2019-11-23 21:22:23,751 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 21:22:23,752 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 21:22:23,955 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 21:22:23,955 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 21:22:23,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 21:22:23,957 INFO L82 PathProgramCache]: Analyzing trace with hash -2024338524, now seen corresponding path program 1 times [2019-11-23 21:22:23,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 21:22:23,957 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [316943604] [2019-11-23 21:22:23,957 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 21:22:23,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:24,642 INFO L134 CoverageAnalysis]: Checked inductivity of 479 backedges. 367 proven. 3 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-11-23 21:22:24,644 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [316943604] [2019-11-23 21:22:24,645 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955239597] [2019-11-23 21:22:24,645 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 21:22:24,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:24,776 INFO L255 TraceCheckSpWp]: Trace formula consists of 573 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-23 21:22:24,783 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 21:22:24,979 INFO L134 CoverageAnalysis]: Checked inductivity of 479 backedges. 362 proven. 0 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2019-11-23 21:22:24,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-23 21:22:24,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2019-11-23 21:22:24,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525021673] [2019-11-23 21:22:24,980 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 21:22:24,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 21:22:24,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 21:22:24,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:24,981 INFO L87 Difference]: Start difference. First operand 17944 states and 22080 transitions. Second operand 3 states. [2019-11-23 21:22:28,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 21:22:28,724 INFO L93 Difference]: Finished difference Result 40716 states and 50584 transitions. [2019-11-23 21:22:28,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 21:22:28,725 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 462 [2019-11-23 21:22:28,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 21:22:28,764 INFO L225 Difference]: With dead ends: 40716 [2019-11-23 21:22:28,764 INFO L226 Difference]: Without dead ends: 23464 [2019-11-23 21:22:28,779 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 461 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:28,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23464 states. [2019-11-23 21:22:29,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23464 to 22774. [2019-11-23 21:22:29,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22774 states. [2019-11-23 21:22:29,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22774 states to 22774 states and 27852 transitions. [2019-11-23 21:22:29,074 INFO L78 Accepts]: Start accepts. Automaton has 22774 states and 27852 transitions. Word has length 462 [2019-11-23 21:22:29,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 21:22:29,085 INFO L462 AbstractCegarLoop]: Abstraction has 22774 states and 27852 transitions. [2019-11-23 21:22:29,086 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 21:22:29,086 INFO L276 IsEmpty]: Start isEmpty. Operand 22774 states and 27852 transitions. [2019-11-23 21:22:29,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 523 [2019-11-23 21:22:29,100 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 21:22:29,101 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 21:22:29,312 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 21:22:29,312 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 21:22:29,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 21:22:29,314 INFO L82 PathProgramCache]: Analyzing trace with hash -695080626, now seen corresponding path program 1 times [2019-11-23 21:22:29,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 21:22:29,314 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194918989] [2019-11-23 21:22:29,315 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 21:22:29,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:30,013 INFO L134 CoverageAnalysis]: Checked inductivity of 541 backedges. 427 proven. 3 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2019-11-23 21:22:30,014 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194918989] [2019-11-23 21:22:30,014 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112221056] [2019-11-23 21:22:30,014 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-23 21:22:30,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:30,154 INFO L255 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-23 21:22:30,159 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 21:22:30,491 INFO L134 CoverageAnalysis]: Checked inductivity of 541 backedges. 424 proven. 0 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2019-11-23 21:22:30,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-23 21:22:30,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2019-11-23 21:22:30,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042740217] [2019-11-23 21:22:30,494 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 21:22:30,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 21:22:30,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 21:22:30,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:30,497 INFO L87 Difference]: Start difference. First operand 22774 states and 27852 transitions. Second operand 3 states. [2019-11-23 21:22:34,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 21:22:34,507 INFO L93 Difference]: Finished difference Result 55206 states and 69552 transitions. [2019-11-23 21:22:34,507 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 21:22:34,508 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 522 [2019-11-23 21:22:34,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 21:22:34,547 INFO L225 Difference]: With dead ends: 55206 [2019-11-23 21:22:34,548 INFO L226 Difference]: Without dead ends: 33124 [2019-11-23 21:22:34,569 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 521 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:34,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33124 states. [2019-11-23 21:22:34,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33124 to 33124. [2019-11-23 21:22:34,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33124 states. [2019-11-23 21:22:35,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33124 states to 33124 states and 40964 transitions. [2019-11-23 21:22:35,029 INFO L78 Accepts]: Start accepts. Automaton has 33124 states and 40964 transitions. Word has length 522 [2019-11-23 21:22:35,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 21:22:35,031 INFO L462 AbstractCegarLoop]: Abstraction has 33124 states and 40964 transitions. [2019-11-23 21:22:35,031 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 21:22:35,031 INFO L276 IsEmpty]: Start isEmpty. Operand 33124 states and 40964 transitions. [2019-11-23 21:22:35,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 557 [2019-11-23 21:22:35,047 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 21:22:35,048 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 21:22:35,251 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 21:22:35,252 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 21:22:35,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 21:22:35,252 INFO L82 PathProgramCache]: Analyzing trace with hash -1583113180, now seen corresponding path program 1 times [2019-11-23 21:22:35,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 21:22:35,262 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702925918] [2019-11-23 21:22:35,263 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 21:22:35,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:35,963 INFO L134 CoverageAnalysis]: Checked inductivity of 772 backedges. 511 proven. 3 refuted. 0 times theorem prover too weak. 258 trivial. 0 not checked. [2019-11-23 21:22:35,963 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702925918] [2019-11-23 21:22:35,963 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365262588] [2019-11-23 21:22:35,964 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 21:22:36,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:36,101 INFO L255 TraceCheckSpWp]: Trace formula consists of 687 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-23 21:22:36,107 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 21:22:36,628 INFO L134 CoverageAnalysis]: Checked inductivity of 772 backedges. 405 proven. 0 refuted. 0 times theorem prover too weak. 367 trivial. 0 not checked. [2019-11-23 21:22:36,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-23 21:22:36,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2019-11-23 21:22:36,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091684217] [2019-11-23 21:22:36,630 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 21:22:36,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 21:22:36,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 21:22:36,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:36,630 INFO L87 Difference]: Start difference. First operand 33124 states and 40964 transitions. Second operand 3 states. [2019-11-23 21:22:40,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 21:22:40,369 INFO L93 Difference]: Finished difference Result 77976 states and 96929 transitions. [2019-11-23 21:22:40,369 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 21:22:40,369 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 556 [2019-11-23 21:22:40,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 21:22:40,427 INFO L225 Difference]: With dead ends: 77976 [2019-11-23 21:22:40,428 INFO L226 Difference]: Without dead ends: 45544 [2019-11-23 21:22:40,453 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 560 GetRequests, 555 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:40,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45544 states. [2019-11-23 21:22:41,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45544 to 41404. [2019-11-23 21:22:41,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41404 states. [2019-11-23 21:22:41,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41404 states to 41404 states and 51506 transitions. [2019-11-23 21:22:41,848 INFO L78 Accepts]: Start accepts. Automaton has 41404 states and 51506 transitions. Word has length 556 [2019-11-23 21:22:41,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 21:22:41,849 INFO L462 AbstractCegarLoop]: Abstraction has 41404 states and 51506 transitions. [2019-11-23 21:22:41,849 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 21:22:41,849 INFO L276 IsEmpty]: Start isEmpty. Operand 41404 states and 51506 transitions. [2019-11-23 21:22:41,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 617 [2019-11-23 21:22:41,860 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 21:22:41,862 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 21:22:42,068 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 21:22:42,068 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 21:22:42,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 21:22:42,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1605578740, now seen corresponding path program 1 times [2019-11-23 21:22:42,069 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 21:22:42,070 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318110331] [2019-11-23 21:22:42,070 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 21:22:42,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:42,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1063 backedges. 621 proven. 3 refuted. 0 times theorem prover too weak. 439 trivial. 0 not checked. [2019-11-23 21:22:42,935 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318110331] [2019-11-23 21:22:42,936 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852224862] [2019-11-23 21:22:42,936 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 21:22:43,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:43,137 INFO L255 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-23 21:22:43,157 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 21:22:43,539 INFO L134 CoverageAnalysis]: Checked inductivity of 1063 backedges. 652 proven. 0 refuted. 0 times theorem prover too weak. 411 trivial. 0 not checked. [2019-11-23 21:22:43,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-23 21:22:43,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2019-11-23 21:22:43,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167439033] [2019-11-23 21:22:43,542 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 21:22:43,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 21:22:43,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 21:22:43,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:43,543 INFO L87 Difference]: Start difference. First operand 41404 states and 51506 transitions. Second operand 3 states. [2019-11-23 21:22:47,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 21:22:47,197 INFO L93 Difference]: Finished difference Result 92466 states and 114980 transitions. [2019-11-23 21:22:47,197 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 21:22:47,197 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 616 [2019-11-23 21:22:47,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 21:22:47,246 INFO L225 Difference]: With dead ends: 92466 [2019-11-23 21:22:47,247 INFO L226 Difference]: Without dead ends: 46924 [2019-11-23 21:22:47,276 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 620 GetRequests, 615 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-23 21:22:47,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46924 states. [2019-11-23 21:22:47,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46924 to 44854. [2019-11-23 21:22:47,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44854 states. [2019-11-23 21:22:47,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44854 states to 44854 states and 48046 transitions. [2019-11-23 21:22:47,891 INFO L78 Accepts]: Start accepts. Automaton has 44854 states and 48046 transitions. Word has length 616 [2019-11-23 21:22:47,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 21:22:47,891 INFO L462 AbstractCegarLoop]: Abstraction has 44854 states and 48046 transitions. [2019-11-23 21:22:47,891 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 21:22:47,891 INFO L276 IsEmpty]: Start isEmpty. Operand 44854 states and 48046 transitions. [2019-11-23 21:22:47,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1083 [2019-11-23 21:22:47,905 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 21:22:47,906 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 21:22:48,110 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 21:22:48,110 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 21:22:48,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 21:22:48,111 INFO L82 PathProgramCache]: Analyzing trace with hash 122234868, now seen corresponding path program 1 times [2019-11-23 21:22:48,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 21:22:48,111 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847135237] [2019-11-23 21:22:48,111 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 21:22:48,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:49,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 219 proven. 0 refuted. 0 times theorem prover too weak. 942 trivial. 0 not checked. [2019-11-23 21:22:49,681 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847135237] [2019-11-23 21:22:49,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 21:22:49,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-23 21:22:49,686 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331386199] [2019-11-23 21:22:49,688 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 21:22:49,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 21:22:49,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 21:22:49,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 21:22:49,689 INFO L87 Difference]: Start difference. First operand 44854 states and 48046 transitions. Second operand 4 states. [2019-11-23 21:22:54,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 21:22:54,126 INFO L93 Difference]: Finished difference Result 89016 states and 95399 transitions. [2019-11-23 21:22:54,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 21:22:54,126 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 1082 [2019-11-23 21:22:54,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 21:22:54,163 INFO L225 Difference]: With dead ends: 89016 [2019-11-23 21:22:54,163 INFO L226 Difference]: Without dead ends: 44854 [2019-11-23 21:22:54,186 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 21:22:54,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44854 states. [2019-11-23 21:22:55,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44854 to 42094. [2019-11-23 21:22:55,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42094 states. [2019-11-23 21:22:55,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42094 states to 42094 states and 43891 transitions. [2019-11-23 21:22:55,604 INFO L78 Accepts]: Start accepts. Automaton has 42094 states and 43891 transitions. Word has length 1082 [2019-11-23 21:22:55,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 21:22:55,605 INFO L462 AbstractCegarLoop]: Abstraction has 42094 states and 43891 transitions. [2019-11-23 21:22:55,605 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 21:22:55,605 INFO L276 IsEmpty]: Start isEmpty. Operand 42094 states and 43891 transitions. [2019-11-23 21:22:55,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1500 [2019-11-23 21:22:55,641 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 21:22:55,642 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 21:22:55,642 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 21:22:55,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 21:22:55,643 INFO L82 PathProgramCache]: Analyzing trace with hash -1021846528, now seen corresponding path program 1 times [2019-11-23 21:22:55,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 21:22:55,644 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987586523] [2019-11-23 21:22:55,644 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 21:22:55,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 21:22:57,272 INFO L134 CoverageAnalysis]: Checked inductivity of 2229 backedges. 1570 proven. 0 refuted. 0 times theorem prover too weak. 659 trivial. 0 not checked. [2019-11-23 21:22:57,272 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987586523] [2019-11-23 21:22:57,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 21:22:57,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-23 21:22:57,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379445525] [2019-11-23 21:22:57,274 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 21:22:57,275 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 21:22:57,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 21:22:57,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 21:22:57,275 INFO L87 Difference]: Start difference. First operand 42094 states and 43891 transitions. Second operand 4 states.