/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/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:50:31,757 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:50:31,761 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:50:31,800 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 22:50:31,823 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:50:31,826 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:50:31,828 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:50:31,830 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:50:31,831 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:50:31,832 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:50:31,833 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:50:31,841 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:50:31,843 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:50:31,844 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:50:31,845 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:50:31,846 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:50:31,858 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 22:50:31,870 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:50:31,871 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:50:31,872 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:50:31,873 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 22:50:31,895 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:50:31,895 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:50:31,897 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:50:31,897 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:50:31,897 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:50:31,897 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:50:31,898 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:50:31,898 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:50:31,898 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:50:31,898 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:50:31,898 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:50:31,898 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:50:31,899 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:50:31,899 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:50:31,899 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:50:31,899 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:50:31,899 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:50:31,900 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:50:31,900 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:50:31,900 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:50:31,900 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:50:31,900 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:50:31,901 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:50:31,901 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:50:31,901 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:50:31,901 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:50:31,901 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:50:31,901 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:50:31,902 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:50:31,902 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDEST; [2020-08-18 22:50:32,237 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:50:32,252 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:50:32,255 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:50:32,257 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:50:32,257 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:50:32,258 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 22:50:32,324 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/52a130633/fdbefe806bce4295823b5713f288a15e/FLAG4b1516970 [2020-08-18 22:50:32,831 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:50:32,832 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 22:50:32,838 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/52a130633/fdbefe806bce4295823b5713f288a15e/FLAG4b1516970 [2020-08-18 22:50:33,247 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/52a130633/fdbefe806bce4295823b5713f288a15e [2020-08-18 22:50:33,256 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:50:33,257 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:50:33,258 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:50:33,258 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:50:33,261 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:50:33,262 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:50:33" (1/1) ... [2020-08-18 22:50:33,265 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b5d0024 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:33, skipping insertion in model container [2020-08-18 22:50:33,266 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:50:33" (1/1) ... [2020-08-18 22:50:33,273 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:50:33,288 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:50:33,459 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:50:33,512 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:50:33,531 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:50:33,675 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:50:33,675 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:33 WrapperNode [2020-08-18 22:50:33,676 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:50:33,676 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:50:33,677 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:50:33,677 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:50:33,690 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:33" (1/1) ... [2020-08-18 22:50:33,691 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:33" (1/1) ... [2020-08-18 22:50:33,698 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:33" (1/1) ... [2020-08-18 22:50:33,699 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:33" (1/1) ... [2020-08-18 22:50:33,721 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:33" (1/1) ... [2020-08-18 22:50:33,728 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:33" (1/1) ... [2020-08-18 22:50:33,729 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:33" (1/1) ... [2020-08-18 22:50:33,731 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:50:33,732 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:50:33,732 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:50:33,732 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:50:33,733 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:33" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-18 22:50:33,797 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:50:33,798 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:50:33,798 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:50:33,798 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:50:33,798 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:50:33,798 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 22:50:33,799 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 22:50:33,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:50:33,799 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 22:50:33,799 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-18 22:50:33,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:50:33,799 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 22:50:34,062 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:50:34,062 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 22:50:34,066 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:50:34 BoogieIcfgContainer [2020-08-18 22:50:34,066 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:50:34,067 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:50:34,068 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:50:34,071 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:50:34,071 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:50:33" (1/3) ... [2020-08-18 22:50:34,072 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d53cd11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:50:34, skipping insertion in model container [2020-08-18 22:50:34,072 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:50:33" (2/3) ... [2020-08-18 22:50:34,072 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d53cd11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:50:34, skipping insertion in model container [2020-08-18 22:50:34,073 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:50:34" (3/3) ... [2020-08-18 22:50:34,074 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-18 22:50:34,085 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:50:34,096 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:50:34,111 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:50:34,130 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:50:34,130 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:50:34,130 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:50:34,130 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:50:34,130 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:50:34,131 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:50:34,131 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:50:34,131 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:50:34,148 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-18 22:50:34,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 22:50:34,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:34,154 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:34,155 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:34,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:34,160 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-18 22:50:34,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:34,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [326317426] [2020-08-18 22:50:34,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:34,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:34,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:34,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:34,377 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:34,378 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [326317426] [2020-08-18 22:50:34,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:50:34,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 22:50:34,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172398389] [2020-08-18 22:50:34,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 22:50:34,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:34,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 22:50:34,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:50:34,407 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-18 22:50:34,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:34,512 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-18 22:50:34,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 22:50:34,515 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-18 22:50:34,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:34,533 INFO L225 Difference]: With dead ends: 42 [2020-08-18 22:50:34,534 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 22:50:34,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:50:34,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 22:50:34,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-18 22:50:34,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 22:50:34,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 22:50:34,571 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-18 22:50:34,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:34,571 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 22:50:34,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 22:50:34,572 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 22:50:34,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 22:50:34,572 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:34,572 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:34,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:50:34,573 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:34,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:34,574 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-18 22:50:34,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:34,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291417674] [2020-08-18 22:50:34,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:34,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:34,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:34,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:34,692 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:34,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291417674] [2020-08-18 22:50:34,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:50:34,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 22:50:34,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765380258] [2020-08-18 22:50:34,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:50:34,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:34,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:50:34,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:50:34,697 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-18 22:50:34,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:34,800 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-18 22:50:34,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:50:34,800 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-18 22:50:34,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:34,802 INFO L225 Difference]: With dead ends: 36 [2020-08-18 22:50:34,802 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 22:50:34,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:50:34,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 22:50:34,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-18 22:50:34,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 22:50:34,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 22:50:34,810 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-18 22:50:34,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:34,811 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 22:50:34,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:50:34,811 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 22:50:34,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 22:50:34,812 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:34,812 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:34,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:50:34,812 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:34,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:34,813 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-18 22:50:34,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:34,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929144685] [2020-08-18 22:50:34,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:34,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:34,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:34,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:34,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:34,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [929144685] [2020-08-18 22:50:34,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:50:34,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 22:50:34,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042965418] [2020-08-18 22:50:34,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:50:34,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:34,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:50:34,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:50:34,911 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-18 22:50:35,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:35,015 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-18 22:50:35,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:50:35,016 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 22:50:35,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:35,017 INFO L225 Difference]: With dead ends: 40 [2020-08-18 22:50:35,018 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 22:50:35,019 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:50:35,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 22:50:35,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-18 22:50:35,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 22:50:35,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 22:50:35,026 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-18 22:50:35,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:35,026 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 22:50:35,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:50:35,027 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 22:50:35,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 22:50:35,028 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:35,028 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:35,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:50:35,029 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:35,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:35,029 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-18 22:50:35,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:35,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597153589] [2020-08-18 22:50:35,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:35,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:35,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:35,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:35,097 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:35,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597153589] [2020-08-18 22:50:35,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:50:35,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 22:50:35,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732321711] [2020-08-18 22:50:35,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:50:35,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:35,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:50:35,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:50:35,101 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-18 22:50:35,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:35,199 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-18 22:50:35,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:50:35,200 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-18 22:50:35,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:35,201 INFO L225 Difference]: With dead ends: 31 [2020-08-18 22:50:35,201 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 22:50:35,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:50:35,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 22:50:35,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-18 22:50:35,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 22:50:35,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 22:50:35,208 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-18 22:50:35,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:35,209 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 22:50:35,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:50:35,209 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 22:50:35,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 22:50:35,210 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:35,210 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:35,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:50:35,211 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:35,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:35,212 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-18 22:50:35,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:35,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [667137113] [2020-08-18 22:50:35,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:35,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:35,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:35,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:35,340 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:35,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [667137113] [2020-08-18 22:50:35,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:35,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 22:50:35,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945536570] [2020-08-18 22:50:35,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:50:35,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:35,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:50:35,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:50:35,343 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-18 22:50:35,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:35,428 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-18 22:50:35,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:50:35,430 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-18 22:50:35,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:35,431 INFO L225 Difference]: With dead ends: 34 [2020-08-18 22:50:35,431 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 22:50:35,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:50:35,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 22:50:35,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-18 22:50:35,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 22:50:35,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 22:50:35,446 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-18 22:50:35,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:35,446 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 22:50:35,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:50:35,448 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 22:50:35,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 22:50:35,449 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:35,450 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:35,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:50:35,450 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:35,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:35,452 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-18 22:50:35,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:35,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210919240] [2020-08-18 22:50:35,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:35,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:35,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:35,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:35,639 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:35,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210919240] [2020-08-18 22:50:35,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:35,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 22:50:35,641 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280956186] [2020-08-18 22:50:35,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 22:50:35,641 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:35,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 22:50:35,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:50:35,642 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-18 22:50:35,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:35,727 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-18 22:50:35,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 22:50:35,728 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 22:50:35,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:35,729 INFO L225 Difference]: With dead ends: 38 [2020-08-18 22:50:35,729 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 22:50:35,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:50:35,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 22:50:35,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-18 22:50:35,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 22:50:35,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-18 22:50:35,736 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-18 22:50:35,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:35,736 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-18 22:50:35,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 22:50:35,737 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-18 22:50:35,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 22:50:35,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:35,738 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:35,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:50:35,738 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:35,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:35,739 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-18 22:50:35,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:35,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [905035969] [2020-08-18 22:50:35,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:35,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:35,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:35,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:35,862 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:35,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [905035969] [2020-08-18 22:50:35,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:35,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:50:35,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117439018] [2020-08-18 22:50:35,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:50:35,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:35,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:50:35,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:50:35,865 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-18 22:50:35,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:35,969 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-18 22:50:35,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 22:50:35,970 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-18 22:50:35,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:35,971 INFO L225 Difference]: With dead ends: 42 [2020-08-18 22:50:35,971 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 22:50:35,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:50:35,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 22:50:35,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-18 22:50:35,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 22:50:35,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 22:50:35,977 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-18 22:50:35,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:35,978 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 22:50:35,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:50:35,978 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 22:50:35,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 22:50:35,979 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:35,979 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:35,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:50:35,979 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:35,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:35,980 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-18 22:50:35,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:35,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [484582295] [2020-08-18 22:50:35,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:36,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:36,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:36,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:36,141 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:36,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [484582295] [2020-08-18 22:50:36,142 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:36,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:50:36,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639747089] [2020-08-18 22:50:36,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:50:36,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:36,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:50:36,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:50:36,146 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-18 22:50:36,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:36,300 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-18 22:50:36,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:50:36,300 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-18 22:50:36,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:36,301 INFO L225 Difference]: With dead ends: 46 [2020-08-18 22:50:36,301 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 22:50:36,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:50:36,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 22:50:36,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-18 22:50:36,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 22:50:36,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-18 22:50:36,310 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-18 22:50:36,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:36,312 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-18 22:50:36,312 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:50:36,312 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-18 22:50:36,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 22:50:36,313 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:36,314 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:36,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:50:36,314 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:36,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:36,315 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-18 22:50:36,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:36,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422250601] [2020-08-18 22:50:36,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:36,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:36,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:36,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:36,479 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:36,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422250601] [2020-08-18 22:50:36,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:36,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:50:36,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237716766] [2020-08-18 22:50:36,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:50:36,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:36,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:50:36,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:50:36,481 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-18 22:50:36,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:36,623 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-18 22:50:36,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:50:36,624 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-18 22:50:36,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:36,625 INFO L225 Difference]: With dead ends: 50 [2020-08-18 22:50:36,625 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 22:50:36,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:50:36,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 22:50:36,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 22:50:36,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 22:50:36,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-18 22:50:36,637 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-18 22:50:36,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:36,637 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-18 22:50:36,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:50:36,637 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-18 22:50:36,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 22:50:36,639 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:36,640 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:36,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:50:36,640 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:36,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:36,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-18 22:50:36,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:36,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928461025] [2020-08-18 22:50:36,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:36,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:36,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:36,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:36,851 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:36,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928461025] [2020-08-18 22:50:36,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:36,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 22:50:36,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127258038] [2020-08-18 22:50:36,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 22:50:36,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:36,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 22:50:36,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:50:36,855 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-18 22:50:37,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:37,056 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-18 22:50:37,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 22:50:37,057 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 22:50:37,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:37,058 INFO L225 Difference]: With dead ends: 54 [2020-08-18 22:50:37,058 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 22:50:37,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:50:37,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 22:50:37,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-18 22:50:37,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 22:50:37,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-18 22:50:37,064 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-18 22:50:37,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:37,064 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-18 22:50:37,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 22:50:37,065 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-18 22:50:37,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 22:50:37,066 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:37,066 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:37,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:50:37,066 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:37,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:37,066 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-18 22:50:37,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:37,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80171850] [2020-08-18 22:50:37,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:37,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:37,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:37,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:37,270 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:37,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80171850] [2020-08-18 22:50:37,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:37,271 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 22:50:37,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002248798] [2020-08-18 22:50:37,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:50:37,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:37,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:50:37,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:50:37,273 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-18 22:50:37,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:37,500 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-18 22:50:37,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 22:50:37,500 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-18 22:50:37,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:37,501 INFO L225 Difference]: With dead ends: 58 [2020-08-18 22:50:37,501 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 22:50:37,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:50:37,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 22:50:37,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-18 22:50:37,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 22:50:37,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-18 22:50:37,508 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-18 22:50:37,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:37,508 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-18 22:50:37,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:50:37,508 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-18 22:50:37,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 22:50:37,509 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:37,509 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:37,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:50:37,510 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:37,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:37,510 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-18 22:50:37,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:37,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1946128875] [2020-08-18 22:50:37,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:37,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:37,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:37,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:37,704 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:37,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1946128875] [2020-08-18 22:50:37,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:37,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 22:50:37,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082854604] [2020-08-18 22:50:37,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 22:50:37,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:37,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 22:50:37,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:50:37,707 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-18 22:50:37,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:37,937 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-18 22:50:37,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 22:50:37,938 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-18 22:50:37,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:37,938 INFO L225 Difference]: With dead ends: 62 [2020-08-18 22:50:37,938 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 22:50:37,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:50:37,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 22:50:37,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-18 22:50:37,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 22:50:37,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-18 22:50:37,945 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-18 22:50:37,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:37,945 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-18 22:50:37,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 22:50:37,946 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-18 22:50:37,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 22:50:37,946 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:37,946 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:37,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 22:50:37,947 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:37,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:37,947 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-18 22:50:37,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:37,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1792034128] [2020-08-18 22:50:37,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:37,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:38,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:38,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:38,189 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:38,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1792034128] [2020-08-18 22:50:38,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:38,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:50:38,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305252057] [2020-08-18 22:50:38,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:50:38,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:38,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:50:38,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:50:38,192 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-18 22:50:38,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:38,446 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-18 22:50:38,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 22:50:38,447 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-18 22:50:38,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:38,448 INFO L225 Difference]: With dead ends: 66 [2020-08-18 22:50:38,448 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 22:50:38,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:50:38,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 22:50:38,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-18 22:50:38,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 22:50:38,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-18 22:50:38,454 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-18 22:50:38,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:38,455 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-18 22:50:38,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:50:38,455 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-18 22:50:38,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 22:50:38,456 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:38,456 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:38,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 22:50:38,456 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:38,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:38,457 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-18 22:50:38,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:38,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [4260075] [2020-08-18 22:50:38,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:38,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:38,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:38,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:38,710 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:38,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [4260075] [2020-08-18 22:50:38,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:38,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 22:50:38,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716954439] [2020-08-18 22:50:38,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 22:50:38,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:38,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 22:50:38,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:50:38,713 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-18 22:50:39,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:39,032 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-18 22:50:39,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 22:50:39,032 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-18 22:50:39,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:39,033 INFO L225 Difference]: With dead ends: 70 [2020-08-18 22:50:39,033 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 22:50:39,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:50:39,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 22:50:39,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-18 22:50:39,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 22:50:39,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-18 22:50:39,047 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-18 22:50:39,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:39,047 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-18 22:50:39,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 22:50:39,047 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-18 22:50:39,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 22:50:39,048 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:39,049 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:39,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 22:50:39,049 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:39,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:39,050 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-18 22:50:39,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:39,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474356916] [2020-08-18 22:50:39,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:39,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:39,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:39,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:39,344 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:39,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474356916] [2020-08-18 22:50:39,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:39,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 22:50:39,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080679550] [2020-08-18 22:50:39,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 22:50:39,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:39,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 22:50:39,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:50:39,347 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-18 22:50:39,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:39,736 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-18 22:50:39,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 22:50:39,736 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 22:50:39,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:39,737 INFO L225 Difference]: With dead ends: 74 [2020-08-18 22:50:39,737 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 22:50:39,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:50:39,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 22:50:39,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-18 22:50:39,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 22:50:39,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-18 22:50:39,745 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-18 22:50:39,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:39,747 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-18 22:50:39,747 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 22:50:39,747 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-18 22:50:39,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 22:50:39,748 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:39,748 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:39,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 22:50:39,751 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:39,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:39,752 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-18 22:50:39,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:39,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [304500437] [2020-08-18 22:50:39,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:39,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:40,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:40,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:40,057 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:40,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [304500437] [2020-08-18 22:50:40,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:40,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 22:50:40,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965689259] [2020-08-18 22:50:40,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 22:50:40,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:40,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 22:50:40,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:50:40,060 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-18 22:50:40,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:40,453 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-18 22:50:40,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 22:50:40,456 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-18 22:50:40,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:40,457 INFO L225 Difference]: With dead ends: 78 [2020-08-18 22:50:40,457 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 22:50:40,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:50:40,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 22:50:40,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-18 22:50:40,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 22:50:40,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-18 22:50:40,463 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-18 22:50:40,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:40,464 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-18 22:50:40,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 22:50:40,464 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-18 22:50:40,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 22:50:40,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:40,465 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:40,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 22:50:40,465 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:40,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:40,466 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-18 22:50:40,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:40,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1273094042] [2020-08-18 22:50:40,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:40,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:40,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:40,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:40,775 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:40,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1273094042] [2020-08-18 22:50:40,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:40,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 22:50:40,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403680740] [2020-08-18 22:50:40,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 22:50:40,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:40,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 22:50:40,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:50:40,778 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-18 22:50:41,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:41,178 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-18 22:50:41,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 22:50:41,186 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-18 22:50:41,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:41,187 INFO L225 Difference]: With dead ends: 82 [2020-08-18 22:50:41,187 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 22:50:41,188 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:50:41,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 22:50:41,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-18 22:50:41,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 22:50:41,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-18 22:50:41,193 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-18 22:50:41,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:41,193 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-18 22:50:41,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 22:50:41,193 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-18 22:50:41,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 22:50:41,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:41,194 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:41,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 22:50:41,195 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:41,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:41,195 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-18 22:50:41,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:41,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430497059] [2020-08-18 22:50:41,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:41,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:41,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:41,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:41,523 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:41,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430497059] [2020-08-18 22:50:41,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:41,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 22:50:41,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158903443] [2020-08-18 22:50:41,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 22:50:41,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:41,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 22:50:41,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:50:41,526 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-18 22:50:42,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:42,040 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-18 22:50:42,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 22:50:42,041 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-18 22:50:42,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:42,041 INFO L225 Difference]: With dead ends: 86 [2020-08-18 22:50:42,041 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 22:50:42,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:50:42,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 22:50:42,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-18 22:50:42,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 22:50:42,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-18 22:50:42,047 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-18 22:50:42,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:42,048 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-18 22:50:42,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 22:50:42,048 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-18 22:50:42,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 22:50:42,048 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:42,049 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:42,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 22:50:42,049 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:42,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:42,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-18 22:50:42,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:42,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703996774] [2020-08-18 22:50:42,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:42,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:42,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:42,410 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:42,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703996774] [2020-08-18 22:50:42,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:42,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 22:50:42,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888768663] [2020-08-18 22:50:42,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 22:50:42,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:42,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 22:50:42,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:50:42,413 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-18 22:50:42,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:42,936 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-18 22:50:42,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 22:50:42,936 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-18 22:50:42,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:42,937 INFO L225 Difference]: With dead ends: 90 [2020-08-18 22:50:42,937 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 22:50:42,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:50:42,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 22:50:42,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-18 22:50:42,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 22:50:42,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-18 22:50:42,943 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-18 22:50:42,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:42,943 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-18 22:50:42,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 22:50:42,943 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-18 22:50:42,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 22:50:42,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:42,944 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:42,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 22:50:42,944 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:42,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:42,945 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-18 22:50:42,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:42,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [547907300] [2020-08-18 22:50:42,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:42,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:43,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:43,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:43,322 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:43,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [547907300] [2020-08-18 22:50:43,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:43,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 22:50:43,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672136805] [2020-08-18 22:50:43,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 22:50:43,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:43,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 22:50:43,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:50:43,325 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-18 22:50:43,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:43,947 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-18 22:50:43,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 22:50:43,949 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-18 22:50:43,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:43,950 INFO L225 Difference]: With dead ends: 94 [2020-08-18 22:50:43,950 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 22:50:43,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:50:43,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 22:50:43,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-18 22:50:43,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 22:50:43,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-18 22:50:43,956 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-18 22:50:43,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:43,956 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-18 22:50:43,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 22:50:43,956 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-18 22:50:43,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 22:50:43,957 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:43,957 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:43,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 22:50:43,957 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:43,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:43,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-18 22:50:43,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:43,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [886112426] [2020-08-18 22:50:43,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:43,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:44,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:44,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:44,322 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:44,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [886112426] [2020-08-18 22:50:44,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:44,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 22:50:44,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808387191] [2020-08-18 22:50:44,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 22:50:44,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:44,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 22:50:44,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:50:44,327 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-18 22:50:44,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:44,950 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-18 22:50:44,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 22:50:44,950 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-18 22:50:44,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:44,951 INFO L225 Difference]: With dead ends: 98 [2020-08-18 22:50:44,951 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 22:50:44,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:50:44,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 22:50:44,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-18 22:50:44,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 22:50:44,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-18 22:50:44,957 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-18 22:50:44,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:44,957 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-18 22:50:44,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 22:50:44,957 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-18 22:50:44,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 22:50:44,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:44,958 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:44,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 22:50:44,959 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:44,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:44,959 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-18 22:50:44,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:44,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674231863] [2020-08-18 22:50:44,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:44,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:45,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:45,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:45,385 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:45,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674231863] [2020-08-18 22:50:45,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:45,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 22:50:45,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828067730] [2020-08-18 22:50:45,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 22:50:45,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:45,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 22:50:45,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:50:45,387 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-18 22:50:46,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:46,244 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-18 22:50:46,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 22:50:46,247 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-18 22:50:46,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:46,248 INFO L225 Difference]: With dead ends: 102 [2020-08-18 22:50:46,249 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 22:50:46,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:50:46,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 22:50:46,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-18 22:50:46,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 22:50:46,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-18 22:50:46,266 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-18 22:50:46,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:46,266 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-18 22:50:46,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 22:50:46,268 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-18 22:50:46,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 22:50:46,269 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:46,269 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:46,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 22:50:46,270 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:46,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:46,270 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-18 22:50:46,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:46,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [615667038] [2020-08-18 22:50:46,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:46,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:46,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:46,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:46,935 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:46,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [615667038] [2020-08-18 22:50:46,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:46,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 22:50:46,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006758959] [2020-08-18 22:50:46,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 22:50:46,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:46,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 22:50:46,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:50:46,940 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-18 22:50:47,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:47,739 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-18 22:50:47,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 22:50:47,739 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-18 22:50:47,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:47,740 INFO L225 Difference]: With dead ends: 106 [2020-08-18 22:50:47,740 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 22:50:47,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:50:47,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 22:50:47,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-18 22:50:47,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 22:50:47,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-18 22:50:47,746 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-18 22:50:47,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:47,746 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-18 22:50:47,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 22:50:47,746 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-18 22:50:47,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 22:50:47,747 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:47,747 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:47,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 22:50:47,748 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:47,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:47,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-18 22:50:47,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:47,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1902072631] [2020-08-18 22:50:47,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:47,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:48,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:48,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:48,245 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:48,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1902072631] [2020-08-18 22:50:48,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:48,246 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 22:50:48,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278478826] [2020-08-18 22:50:48,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 22:50:48,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:48,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 22:50:48,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:50:48,248 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-18 22:50:49,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:49,108 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-18 22:50:49,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 22:50:49,109 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-18 22:50:49,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:49,110 INFO L225 Difference]: With dead ends: 110 [2020-08-18 22:50:49,110 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 22:50:49,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:50:49,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 22:50:49,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-18 22:50:49,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 22:50:49,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-18 22:50:49,117 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-18 22:50:49,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:49,117 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-18 22:50:49,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 22:50:49,117 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-18 22:50:49,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 22:50:49,118 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:49,118 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:49,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 22:50:49,118 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:49,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:49,119 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-18 22:50:49,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:49,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472126236] [2020-08-18 22:50:49,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:49,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:49,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:49,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:49,656 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:49,656 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472126236] [2020-08-18 22:50:49,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:49,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 22:50:49,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496405889] [2020-08-18 22:50:49,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 22:50:49,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:49,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 22:50:49,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:50:49,657 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-18 22:50:50,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:50,479 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-18 22:50:50,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 22:50:50,479 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-18 22:50:50,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:50,480 INFO L225 Difference]: With dead ends: 114 [2020-08-18 22:50:50,480 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 22:50:50,481 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:50:50,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 22:50:50,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-18 22:50:50,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-18 22:50:50,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-18 22:50:50,486 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-18 22:50:50,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:50,486 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-18 22:50:50,486 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 22:50:50,486 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-18 22:50:50,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-18 22:50:50,486 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:50,487 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:50,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 22:50:50,487 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:50,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:50,487 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-18 22:50:50,487 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:50,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1453980097] [2020-08-18 22:50:50,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:50,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:51,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:51,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:51,120 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:51,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1453980097] [2020-08-18 22:50:51,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:51,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 22:50:51,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226192448] [2020-08-18 22:50:51,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 22:50:51,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:51,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 22:50:51,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:50:51,122 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-18 22:50:52,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:52,080 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-18 22:50:52,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 22:50:52,080 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-18 22:50:52,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:52,081 INFO L225 Difference]: With dead ends: 118 [2020-08-18 22:50:52,081 INFO L226 Difference]: Without dead ends: 65 [2020-08-18 22:50:52,082 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:50:52,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-18 22:50:52,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-18 22:50:52,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-18 22:50:52,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-18 22:50:52,093 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-18 22:50:52,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:52,093 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-18 22:50:52,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 22:50:52,093 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-18 22:50:52,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 22:50:52,095 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:52,095 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:52,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 22:50:52,096 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:52,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:52,097 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-18 22:50:52,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:52,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006585365] [2020-08-18 22:50:52,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:52,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:52,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:52,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:52,739 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:52,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006585365] [2020-08-18 22:50:52,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:52,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 22:50:52,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181307105] [2020-08-18 22:50:52,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 22:50:52,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:52,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 22:50:52,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:50:52,742 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-18 22:50:53,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:53,794 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-18 22:50:53,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 22:50:53,795 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-18 22:50:53,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:53,795 INFO L225 Difference]: With dead ends: 122 [2020-08-18 22:50:53,796 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 22:50:53,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:50:53,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 22:50:53,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-18 22:50:53,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 22:50:53,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-18 22:50:53,802 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-18 22:50:53,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:53,802 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-18 22:50:53,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 22:50:53,802 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-18 22:50:53,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 22:50:53,803 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:53,803 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:53,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 22:50:53,803 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:53,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:53,804 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-18 22:50:53,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:53,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555357407] [2020-08-18 22:50:53,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:53,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:54,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:54,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:54,500 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:54,501 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555357407] [2020-08-18 22:50:54,501 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:54,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 22:50:54,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452749475] [2020-08-18 22:50:54,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 22:50:54,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:54,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 22:50:54,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:50:54,502 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-18 22:50:55,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:55,616 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-18 22:50:55,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 22:50:55,621 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-18 22:50:55,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:55,622 INFO L225 Difference]: With dead ends: 126 [2020-08-18 22:50:55,622 INFO L226 Difference]: Without dead ends: 69 [2020-08-18 22:50:55,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:50:55,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-18 22:50:55,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-18 22:50:55,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 22:50:55,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-18 22:50:55,627 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-18 22:50:55,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:55,628 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-18 22:50:55,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 22:50:55,628 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-18 22:50:55,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-18 22:50:55,628 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:55,629 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:55,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 22:50:55,629 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:55,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:55,629 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-18 22:50:55,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:55,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1726115662] [2020-08-18 22:50:55,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:55,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:56,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:56,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:56,275 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:56,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1726115662] [2020-08-18 22:50:56,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:56,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 22:50:56,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246128760] [2020-08-18 22:50:56,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 22:50:56,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:56,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 22:50:56,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:50:56,278 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-18 22:50:57,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:50:57,499 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-18 22:50:57,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 22:50:57,503 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-18 22:50:57,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:50:57,504 INFO L225 Difference]: With dead ends: 130 [2020-08-18 22:50:57,504 INFO L226 Difference]: Without dead ends: 71 [2020-08-18 22:50:57,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:50:57,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-18 22:50:57,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-18 22:50:57,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-18 22:50:57,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-18 22:50:57,510 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-18 22:50:57,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:50:57,511 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-18 22:50:57,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 22:50:57,511 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-18 22:50:57,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 22:50:57,511 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:50:57,512 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:50:57,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 22:50:57,512 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:50:57,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:50:57,512 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-18 22:50:57,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:50:57,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1136703496] [2020-08-18 22:50:57,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:50:57,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:58,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:50:58,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:50:58,492 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:50:58,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1136703496] [2020-08-18 22:50:58,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:50:58,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 22:50:58,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253147058] [2020-08-18 22:50:58,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 22:50:58,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:50:58,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 22:50:58,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:50:58,496 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-18 22:51:00,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:00,182 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-18 22:51:00,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 22:51:00,183 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-18 22:51:00,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:00,184 INFO L225 Difference]: With dead ends: 134 [2020-08-18 22:51:00,184 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 22:51:00,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:51:00,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 22:51:00,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-18 22:51:00,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 22:51:00,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-18 22:51:00,190 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-18 22:51:00,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:00,191 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-18 22:51:00,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 22:51:00,191 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-18 22:51:00,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 22:51:00,192 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:00,192 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:00,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 22:51:00,192 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:00,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:00,192 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-18 22:51:00,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:00,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [666870094] [2020-08-18 22:51:00,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:00,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:01,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:01,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:01,052 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:01,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [666870094] [2020-08-18 22:51:01,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:01,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 22:51:01,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066067660] [2020-08-18 22:51:01,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 22:51:01,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:01,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 22:51:01,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:51:01,054 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-18 22:51:02,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:02,444 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-18 22:51:02,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 22:51:02,445 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-18 22:51:02,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:02,446 INFO L225 Difference]: With dead ends: 138 [2020-08-18 22:51:02,446 INFO L226 Difference]: Without dead ends: 75 [2020-08-18 22:51:02,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:51:02,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-18 22:51:02,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-18 22:51:02,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-18 22:51:02,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-18 22:51:02,452 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-18 22:51:02,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:02,453 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-18 22:51:02,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 22:51:02,453 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-18 22:51:02,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-18 22:51:02,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:02,454 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:02,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 22:51:02,454 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:02,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:02,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-18 22:51:02,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:02,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925376698] [2020-08-18 22:51:02,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:02,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:03,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:03,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:03,390 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:03,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1925376698] [2020-08-18 22:51:03,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:03,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 22:51:03,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364656919] [2020-08-18 22:51:03,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 22:51:03,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:03,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 22:51:03,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:51:03,394 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-18 22:51:04,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:04,951 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-18 22:51:04,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 22:51:04,952 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-18 22:51:04,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:04,953 INFO L225 Difference]: With dead ends: 142 [2020-08-18 22:51:04,953 INFO L226 Difference]: Without dead ends: 77 [2020-08-18 22:51:04,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:51:04,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-18 22:51:04,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-18 22:51:04,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-18 22:51:04,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-18 22:51:04,958 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-18 22:51:04,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:04,958 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-18 22:51:04,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 22:51:04,959 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-18 22:51:04,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 22:51:04,960 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:04,960 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:04,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 22:51:04,960 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:04,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:04,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-18 22:51:04,961 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:04,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [375112552] [2020-08-18 22:51:04,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:05,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:05,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:05,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:05,929 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:05,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [375112552] [2020-08-18 22:51:05,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:05,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 22:51:05,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462836026] [2020-08-18 22:51:05,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 22:51:05,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:05,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 22:51:05,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:51:05,932 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-18 22:51:07,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:07,605 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-18 22:51:07,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 22:51:07,605 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-18 22:51:07,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:07,606 INFO L225 Difference]: With dead ends: 146 [2020-08-18 22:51:07,606 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 22:51:07,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:51:07,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 22:51:07,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-18 22:51:07,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 22:51:07,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-18 22:51:07,617 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-18 22:51:07,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:07,618 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-18 22:51:07,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 22:51:07,618 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-18 22:51:07,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 22:51:07,619 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:07,619 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:07,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 22:51:07,620 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:07,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:07,620 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-18 22:51:07,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:07,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1173226049] [2020-08-18 22:51:07,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:07,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:08,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:08,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:08,623 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:08,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1173226049] [2020-08-18 22:51:08,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:08,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 22:51:08,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322106781] [2020-08-18 22:51:08,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 22:51:08,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:08,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 22:51:08,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:51:08,626 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-18 22:51:10,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:10,390 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-18 22:51:10,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 22:51:10,391 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-18 22:51:10,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:10,392 INFO L225 Difference]: With dead ends: 150 [2020-08-18 22:51:10,392 INFO L226 Difference]: Without dead ends: 81 [2020-08-18 22:51:10,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:51:10,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-18 22:51:10,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-18 22:51:10,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-18 22:51:10,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-18 22:51:10,399 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-18 22:51:10,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:10,399 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-18 22:51:10,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 22:51:10,399 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-18 22:51:10,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-18 22:51:10,400 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:10,400 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:10,400 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 22:51:10,400 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:10,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:10,401 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-18 22:51:10,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:10,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928850607] [2020-08-18 22:51:10,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:10,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:11,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:11,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:11,397 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:11,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928850607] [2020-08-18 22:51:11,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:11,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 22:51:11,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961701078] [2020-08-18 22:51:11,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 22:51:11,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:11,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 22:51:11,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:51:11,400 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-18 22:51:13,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:13,275 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-18 22:51:13,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 22:51:13,276 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-18 22:51:13,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:13,277 INFO L225 Difference]: With dead ends: 154 [2020-08-18 22:51:13,277 INFO L226 Difference]: Without dead ends: 83 [2020-08-18 22:51:13,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:51:13,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-18 22:51:13,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-18 22:51:13,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-18 22:51:13,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-18 22:51:13,283 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-18 22:51:13,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:13,283 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-18 22:51:13,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 22:51:13,284 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-18 22:51:13,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 22:51:13,284 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:13,285 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:13,285 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 22:51:13,285 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:13,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:13,285 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-18 22:51:13,285 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:13,286 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1584004252] [2020-08-18 22:51:13,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:13,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:14,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:14,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:14,388 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:14,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1584004252] [2020-08-18 22:51:14,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:14,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 22:51:14,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829748711] [2020-08-18 22:51:14,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 22:51:14,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:14,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 22:51:14,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:51:14,390 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-18 22:51:16,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:16,262 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-18 22:51:16,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 22:51:16,263 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-18 22:51:16,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:16,264 INFO L225 Difference]: With dead ends: 158 [2020-08-18 22:51:16,264 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 22:51:16,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:51:16,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 22:51:16,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-18 22:51:16,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 22:51:16,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-18 22:51:16,271 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-18 22:51:16,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:16,271 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-18 22:51:16,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 22:51:16,271 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-18 22:51:16,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 22:51:16,272 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:16,272 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:16,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 22:51:16,273 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:16,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:16,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-18 22:51:16,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:16,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [201059024] [2020-08-18 22:51:16,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:16,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:17,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:17,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:17,442 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:17,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [201059024] [2020-08-18 22:51:17,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:17,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 22:51:17,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796192129] [2020-08-18 22:51:17,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 22:51:17,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:17,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 22:51:17,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:51:17,444 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-18 22:51:19,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:19,428 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-18 22:51:19,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 22:51:19,430 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-18 22:51:19,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:19,430 INFO L225 Difference]: With dead ends: 162 [2020-08-18 22:51:19,430 INFO L226 Difference]: Without dead ends: 87 [2020-08-18 22:51:19,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:51:19,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-18 22:51:19,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-18 22:51:19,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-18 22:51:19,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-18 22:51:19,435 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-18 22:51:19,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:19,435 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-18 22:51:19,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 22:51:19,435 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-18 22:51:19,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-18 22:51:19,436 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:19,436 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:19,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 22:51:19,437 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:19,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:19,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-18 22:51:19,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:19,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [340403834] [2020-08-18 22:51:19,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:19,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:20,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:20,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:20,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:20,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [340403834] [2020-08-18 22:51:20,653 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:20,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 22:51:20,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090308199] [2020-08-18 22:51:20,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 22:51:20,654 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:20,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 22:51:20,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:51:20,655 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-18 22:51:22,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:22,809 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-18 22:51:22,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 22:51:22,810 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-18 22:51:22,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:22,812 INFO L225 Difference]: With dead ends: 166 [2020-08-18 22:51:22,812 INFO L226 Difference]: Without dead ends: 89 [2020-08-18 22:51:22,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:51:22,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-18 22:51:22,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-18 22:51:22,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-18 22:51:22,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-18 22:51:22,818 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-18 22:51:22,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:22,819 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-18 22:51:22,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 22:51:22,819 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-18 22:51:22,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-18 22:51:22,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:22,820 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:22,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 22:51:22,820 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:22,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:22,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-18 22:51:22,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:22,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [823474295] [2020-08-18 22:51:22,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:22,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:24,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:24,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:24,219 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:24,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [823474295] [2020-08-18 22:51:24,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:24,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 22:51:24,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991484427] [2020-08-18 22:51:24,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 22:51:24,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:24,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 22:51:24,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:51:24,221 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-18 22:51:26,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:26,531 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-18 22:51:26,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 22:51:26,532 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-18 22:51:26,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:26,533 INFO L225 Difference]: With dead ends: 170 [2020-08-18 22:51:26,534 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 22:51:26,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:51:26,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 22:51:26,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-18 22:51:26,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 22:51:26,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-18 22:51:26,555 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-18 22:51:26,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:26,555 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-18 22:51:26,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 22:51:26,556 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-18 22:51:26,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 22:51:26,558 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:26,558 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:26,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 22:51:26,558 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:26,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:26,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-18 22:51:26,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:26,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1159119098] [2020-08-18 22:51:26,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:26,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:27,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:27,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:28,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:28,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1159119098] [2020-08-18 22:51:28,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:28,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 22:51:28,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940310342] [2020-08-18 22:51:28,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 22:51:28,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:28,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 22:51:28,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:51:28,013 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-18 22:51:30,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:30,483 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-18 22:51:30,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 22:51:30,486 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-18 22:51:30,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:30,487 INFO L225 Difference]: With dead ends: 174 [2020-08-18 22:51:30,487 INFO L226 Difference]: Without dead ends: 93 [2020-08-18 22:51:30,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:51:30,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-18 22:51:30,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-18 22:51:30,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-18 22:51:30,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-18 22:51:30,495 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-18 22:51:30,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:30,495 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-18 22:51:30,495 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 22:51:30,495 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-18 22:51:30,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-18 22:51:30,496 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:30,496 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:30,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 22:51:30,497 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:30,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:30,497 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-18 22:51:30,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:30,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [624688610] [2020-08-18 22:51:30,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:30,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:32,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:32,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:32,122 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:32,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [624688610] [2020-08-18 22:51:32,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:32,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 22:51:32,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4259206] [2020-08-18 22:51:32,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 22:51:32,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:32,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 22:51:32,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:51:32,124 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.