/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/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:51:18,754 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:51:18,757 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:51:18,796 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 22:51:18,820 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:51:18,823 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:51:18,825 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:51:18,827 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:51:18,828 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:51:18,829 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:51:18,830 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:51:18,839 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:51:18,841 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:51:18,842 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:51:18,843 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:51:18,844 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:51:18,852 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 22:51:18,864 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:51:18,865 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:51:18,865 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:51:18,867 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 22:51:18,903 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:51:18,904 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:51:18,905 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:51:18,906 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:51:18,906 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:51:18,906 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:51:18,906 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:51:18,906 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:51:18,907 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:51:18,907 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:51:18,908 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:51:18,908 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:51:18,908 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:51:18,909 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:51:18,909 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:51:18,909 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:51:18,909 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:51:18,909 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:51:18,910 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:51:18,910 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:51:18,910 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:51:18,910 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:51:18,910 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:51:18,910 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:51:18,911 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:51:18,911 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:51:18,911 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:51:18,911 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:51:18,911 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:51:18,912 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 22:51:19,207 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:51:19,220 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:51:19,223 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:51:19,225 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:51:19,225 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:51:19,226 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 22:51:19,300 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/714adb22b/033db9a32c9b4ed2906a4360c1d02f2e/FLAG45daccd55 [2020-08-18 22:51:19,706 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:51:19,706 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 22:51:19,712 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/714adb22b/033db9a32c9b4ed2906a4360c1d02f2e/FLAG45daccd55 [2020-08-18 22:51:20,092 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/714adb22b/033db9a32c9b4ed2906a4360c1d02f2e [2020-08-18 22:51:20,100 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:51:20,101 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:51:20,103 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:51:20,103 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:51:20,106 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:51:20,107 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:51:20" (1/1) ... [2020-08-18 22:51:20,110 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6256357c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:51:20, skipping insertion in model container [2020-08-18 22:51:20,111 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:51:20" (1/1) ... [2020-08-18 22:51:20,118 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:51:20,136 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:51:20,359 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:51:20,366 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:51:20,387 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:51:20,400 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:51:20,401 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:51:20 WrapperNode [2020-08-18 22:51:20,401 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:51:20,402 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:51:20,402 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:51:20,402 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:51:20,412 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:51:20" (1/1) ... [2020-08-18 22:51:20,412 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:51:20" (1/1) ... [2020-08-18 22:51:20,417 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:51:20" (1/1) ... [2020-08-18 22:51:20,418 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:51:20" (1/1) ... [2020-08-18 22:51:20,421 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:51:20" (1/1) ... [2020-08-18 22:51:20,426 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:51:20" (1/1) ... [2020-08-18 22:51:20,427 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:51:20" (1/1) ... [2020-08-18 22:51:20,428 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:51:20,429 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:51:20,429 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:51:20,429 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:51:20,430 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:51:20" (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 22:51:20,566 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:51:20,566 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:51:20,566 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 22:51:20,566 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 22:51:20,567 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:51:20,567 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:51:20,567 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 22:51:20,567 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 22:51:20,567 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 22:51:20,567 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 22:51:20,568 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:51:20,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:51:20,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:51:20,752 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:51:20,753 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 22:51:20,757 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:51:20 BoogieIcfgContainer [2020-08-18 22:51:20,757 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:51:20,758 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:51:20,758 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:51:20,761 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:51:20,762 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:51:20" (1/3) ... [2020-08-18 22:51:20,762 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d8082d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:51:20, skipping insertion in model container [2020-08-18 22:51:20,763 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:51:20" (2/3) ... [2020-08-18 22:51:20,763 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d8082d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:51:20, skipping insertion in model container [2020-08-18 22:51:20,763 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:51:20" (3/3) ... [2020-08-18 22:51:20,765 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-18 22:51:20,774 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:51:20,781 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:51:20,794 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:51:20,817 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:51:20,818 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:51:20,818 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:51:20,818 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:51:20,818 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:51:20,818 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:51:20,818 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:51:20,819 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:51:20,836 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-18 22:51:20,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 22:51:20,840 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:20,841 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:20,842 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:20,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:20,847 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-18 22:51:20,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:20,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806067385] [2020-08-18 22:51:20,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:20,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:20,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:20,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:20,960 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 22:51:20,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806067385] [2020-08-18 22:51:20,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:51:20,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 22:51:20,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412874886] [2020-08-18 22:51:20,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 22:51:20,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:20,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 22:51:20,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 22:51:20,985 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-18 22:51:21,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:21,009 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-18 22:51:21,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 22:51:21,010 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 22:51:21,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:21,019 INFO L225 Difference]: With dead ends: 32 [2020-08-18 22:51:21,019 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 22:51:21,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 22:51:21,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 22:51:21,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 22:51:21,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 22:51:21,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-18 22:51:21,061 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-18 22:51:21,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:21,062 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-18 22:51:21,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 22:51:21,062 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-18 22:51:21,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 22:51:21,063 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:21,063 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:21,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:51:21,064 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:21,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:21,064 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-18 22:51:21,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:21,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [666810321] [2020-08-18 22:51:21,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:21,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:21,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:21,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:21,200 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 22:51:21,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [666810321] [2020-08-18 22:51:21,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:51:21,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 22:51:21,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000293967] [2020-08-18 22:51:21,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:51:21,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:21,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:51:21,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:51:21,206 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-18 22:51:21,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:21,264 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-18 22:51:21,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:51:21,265 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 22:51:21,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:21,266 INFO L225 Difference]: With dead ends: 21 [2020-08-18 22:51:21,266 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 22:51:21,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:51:21,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 22:51:21,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 22:51:21,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 22:51:21,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 22:51:21,274 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-18 22:51:21,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:21,275 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 22:51:21,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:51:21,275 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 22:51:21,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 22:51:21,277 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:21,277 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:21,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:51:21,278 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:21,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:21,279 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-18 22:51:21,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:21,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1935621623] [2020-08-18 22:51:21,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:21,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:21,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:21,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:21,374 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:21,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1935621623] [2020-08-18 22:51:21,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:21,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 22:51:21,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195445395] [2020-08-18 22:51:21,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 22:51:21,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:21,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 22:51:21,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:51:21,377 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-18 22:51:21,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:21,442 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 22:51:21,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:51:21,443 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-18 22:51:21,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:21,445 INFO L225 Difference]: With dead ends: 24 [2020-08-18 22:51:21,445 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 22:51:21,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:51:21,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 22:51:21,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 22:51:21,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 22:51:21,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-18 22:51:21,451 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-18 22:51:21,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:21,452 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-18 22:51:21,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 22:51:21,452 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-18 22:51:21,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 22:51:21,453 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:21,453 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:21,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:51:21,454 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:21,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:21,455 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-18 22:51:21,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:21,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1799197599] [2020-08-18 22:51:21,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:21,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:21,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:21,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:21,575 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:21,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1799197599] [2020-08-18 22:51:21,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:21,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:51:21,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900365866] [2020-08-18 22:51:21,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:51:21,577 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:21,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:51:21,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:51:21,578 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-18 22:51:21,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:21,682 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-18 22:51:21,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 22:51:21,683 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 22:51:21,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:21,684 INFO L225 Difference]: With dead ends: 27 [2020-08-18 22:51:21,684 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 22:51:21,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:51:21,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 22:51:21,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 22:51:21,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 22:51:21,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-18 22:51:21,691 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-18 22:51:21,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:21,692 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-18 22:51:21,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:51:21,692 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-18 22:51:21,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 22:51:21,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:21,693 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:21,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:51:21,694 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:21,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:21,694 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-18 22:51:21,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:21,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573754046] [2020-08-18 22:51:21,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:21,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:21,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:21,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:21,832 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:21,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573754046] [2020-08-18 22:51:21,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:21,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:51:21,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432386161] [2020-08-18 22:51:21,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:51:21,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:21,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:51:21,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:51:21,835 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-18 22:51:21,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:21,923 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-18 22:51:21,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 22:51:21,924 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-18 22:51:21,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:21,925 INFO L225 Difference]: With dead ends: 30 [2020-08-18 22:51:21,925 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 22:51:21,926 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:51:21,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 22:51:21,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 22:51:21,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 22:51:21,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-18 22:51:21,933 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-18 22:51:21,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:21,933 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-18 22:51:21,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:51:21,933 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-18 22:51:21,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 22:51:21,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:21,934 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:21,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:51:21,935 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:21,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:21,936 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-18 22:51:21,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:21,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1348714879] [2020-08-18 22:51:21,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:21,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:22,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:22,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:22,084 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:22,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1348714879] [2020-08-18 22:51:22,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:22,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:51:22,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156840467] [2020-08-18 22:51:22,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:51:22,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:22,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:51:22,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:51:22,092 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-18 22:51:22,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:22,213 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-18 22:51:22,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:51:22,214 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-18 22:51:22,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:22,215 INFO L225 Difference]: With dead ends: 33 [2020-08-18 22:51:22,215 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 22:51:22,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:51:22,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 22:51:22,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 22:51:22,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 22:51:22,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-18 22:51:22,223 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-18 22:51:22,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:22,223 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-18 22:51:22,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:51:22,223 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-18 22:51:22,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 22:51:22,224 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:22,225 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:22,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:51:22,225 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:22,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:22,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-18 22:51:22,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:22,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [278774943] [2020-08-18 22:51:22,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:22,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:22,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:22,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:22,361 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:22,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [278774943] [2020-08-18 22:51:22,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:22,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 22:51:22,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775631031] [2020-08-18 22:51:22,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 22:51:22,363 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:22,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 22:51:22,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:51:22,364 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-18 22:51:22,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:22,461 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-18 22:51:22,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:51:22,462 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 22:51:22,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:22,463 INFO L225 Difference]: With dead ends: 36 [2020-08-18 22:51:22,463 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 22:51:22,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:51:22,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 22:51:22,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 22:51:22,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 22:51:22,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-18 22:51:22,471 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-18 22:51:22,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:22,471 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-18 22:51:22,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 22:51:22,471 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-18 22:51:22,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 22:51:22,472 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:22,472 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:22,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:51:22,473 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:22,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:22,473 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-18 22:51:22,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:22,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [185939588] [2020-08-18 22:51:22,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:22,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:22,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:22,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:22,669 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:22,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [185939588] [2020-08-18 22:51:22,670 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:22,670 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 22:51:22,671 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906915122] [2020-08-18 22:51:22,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:51:22,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:22,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:51:22,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:51:22,674 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-18 22:51:22,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:22,827 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-18 22:51:22,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 22:51:22,828 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 22:51:22,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:22,829 INFO L225 Difference]: With dead ends: 39 [2020-08-18 22:51:22,829 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 22:51:22,830 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:51:22,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 22:51:22,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 22:51:22,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 22:51:22,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-18 22:51:22,847 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-18 22:51:22,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:22,849 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-18 22:51:22,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:51:22,849 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-18 22:51:22,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 22:51:22,852 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:22,852 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:22,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:51:22,852 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:22,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:22,853 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-18 22:51:22,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:22,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031795200] [2020-08-18 22:51:22,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:22,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:22,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:22,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:23,002 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:23,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031795200] [2020-08-18 22:51:23,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:23,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 22:51:23,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842112516] [2020-08-18 22:51:23,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 22:51:23,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:23,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 22:51:23,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:51:23,005 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-18 22:51:23,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:23,165 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-18 22:51:23,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 22:51:23,166 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-18 22:51:23,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:23,166 INFO L225 Difference]: With dead ends: 42 [2020-08-18 22:51:23,167 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 22:51:23,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:51:23,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 22:51:23,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 22:51:23,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 22:51:23,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-18 22:51:23,174 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-18 22:51:23,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:23,174 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-18 22:51:23,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 22:51:23,174 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-18 22:51:23,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 22:51:23,175 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:23,176 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:23,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:51:23,176 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:23,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:23,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-18 22:51:23,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:23,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [405620381] [2020-08-18 22:51:23,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:23,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:23,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:23,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:23,365 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:23,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [405620381] [2020-08-18 22:51:23,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:23,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:51:23,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991185363] [2020-08-18 22:51:23,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:51:23,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:23,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:51:23,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:51:23,368 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-18 22:51:23,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:23,556 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-18 22:51:23,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 22:51:23,557 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 22:51:23,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:23,558 INFO L225 Difference]: With dead ends: 45 [2020-08-18 22:51:23,558 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 22:51:23,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:51:23,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 22:51:23,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 22:51:23,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 22:51:23,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-18 22:51:23,573 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-18 22:51:23,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:23,577 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-18 22:51:23,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:51:23,577 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-18 22:51:23,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 22:51:23,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:23,581 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:23,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:51:23,581 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:23,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:23,582 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-18 22:51:23,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:23,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1630777269] [2020-08-18 22:51:23,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:23,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:23,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:23,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:23,795 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:23,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1630777269] [2020-08-18 22:51:23,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:23,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 22:51:23,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48382125] [2020-08-18 22:51:23,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 22:51:23,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:23,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 22:51:23,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:51:23,799 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-18 22:51:24,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:24,009 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-18 22:51:24,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 22:51:24,009 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-18 22:51:24,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:24,010 INFO L225 Difference]: With dead ends: 48 [2020-08-18 22:51:24,010 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 22:51:24,011 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:51:24,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 22:51:24,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 22:51:24,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 22:51:24,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-18 22:51:24,025 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-18 22:51:24,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:24,025 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-18 22:51:24,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 22:51:24,026 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-18 22:51:24,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 22:51:24,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:24,029 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:24,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:51:24,030 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:24,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:24,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-18 22:51:24,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:24,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689724974] [2020-08-18 22:51:24,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:24,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:24,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:24,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:24,254 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:24,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689724974] [2020-08-18 22:51:24,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:24,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 22:51:24,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106410263] [2020-08-18 22:51:24,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 22:51:24,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:24,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 22:51:24,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:51:24,257 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-18 22:51:24,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:24,484 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-18 22:51:24,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 22:51:24,484 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-18 22:51:24,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:24,485 INFO L225 Difference]: With dead ends: 51 [2020-08-18 22:51:24,485 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 22:51:24,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:51:24,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 22:51:24,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 22:51:24,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 22:51:24,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-18 22:51:24,501 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-18 22:51:24,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:24,501 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-18 22:51:24,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 22:51:24,502 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-18 22:51:24,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 22:51:24,503 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:24,503 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:24,503 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 22:51:24,503 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:24,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:24,504 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-18 22:51:24,504 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:24,504 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [514198572] [2020-08-18 22:51:24,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:24,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:24,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:24,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:24,743 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:24,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [514198572] [2020-08-18 22:51:24,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:24,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 22:51:24,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465492464] [2020-08-18 22:51:24,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 22:51:24,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:24,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 22:51:24,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:51:24,747 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-18 22:51:25,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:25,032 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-18 22:51:25,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 22:51:25,033 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-18 22:51:25,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:25,033 INFO L225 Difference]: With dead ends: 54 [2020-08-18 22:51:25,034 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 22:51:25,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:51:25,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 22:51:25,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 22:51:25,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 22:51:25,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-18 22:51:25,048 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-18 22:51:25,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:25,048 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-18 22:51:25,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 22:51:25,049 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-18 22:51:25,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 22:51:25,049 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:25,050 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:25,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 22:51:25,051 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:25,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:25,052 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-18 22:51:25,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:25,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [801610207] [2020-08-18 22:51:25,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:25,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:25,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:25,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:25,253 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:25,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [801610207] [2020-08-18 22:51:25,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:25,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 22:51:25,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984121387] [2020-08-18 22:51:25,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 22:51:25,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:25,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 22:51:25,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:51:25,256 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-18 22:51:25,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:25,522 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-18 22:51:25,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 22:51:25,523 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 22:51:25,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:25,524 INFO L225 Difference]: With dead ends: 57 [2020-08-18 22:51:25,524 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 22:51:25,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:51:25,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 22:51:25,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 22:51:25,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 22:51:25,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-18 22:51:25,541 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-18 22:51:25,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:25,541 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-18 22:51:25,542 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 22:51:25,543 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-18 22:51:25,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 22:51:25,545 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:25,545 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:25,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 22:51:25,546 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:25,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:25,547 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-18 22:51:25,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:25,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1758540301] [2020-08-18 22:51:25,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:25,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:25,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:25,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:25,859 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:25,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1758540301] [2020-08-18 22:51:25,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:25,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 22:51:25,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565308668] [2020-08-18 22:51:25,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 22:51:25,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:25,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 22:51:25,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:51:25,861 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-18 22:51:26,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:26,183 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-18 22:51:26,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 22:51:26,184 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-18 22:51:26,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:26,185 INFO L225 Difference]: With dead ends: 60 [2020-08-18 22:51:26,185 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 22:51:26,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:51:26,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 22:51:26,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 22:51:26,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 22:51:26,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-18 22:51:26,201 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-18 22:51:26,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:26,202 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-18 22:51:26,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 22:51:26,202 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-18 22:51:26,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 22:51:26,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:26,203 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:26,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 22:51:26,205 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:26,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:26,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-18 22:51:26,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:26,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251301317] [2020-08-18 22:51:26,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:26,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:26,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:26,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:26,460 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:26,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251301317] [2020-08-18 22:51:26,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:26,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 22:51:26,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50465129] [2020-08-18 22:51:26,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 22:51:26,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:26,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 22:51:26,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:51:26,466 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-18 22:51:26,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:26,807 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-18 22:51:26,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 22:51:26,807 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-18 22:51:26,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:26,808 INFO L225 Difference]: With dead ends: 63 [2020-08-18 22:51:26,808 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 22:51:26,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:51:26,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 22:51:26,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 22:51:26,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 22:51:26,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-18 22:51:26,815 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-18 22:51:26,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:26,816 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-18 22:51:26,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 22:51:26,816 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-18 22:51:26,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 22:51:26,817 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:26,817 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:26,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 22:51:26,817 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:26,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:26,818 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-18 22:51:26,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:26,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1806631795] [2020-08-18 22:51:26,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:26,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:27,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:27,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:27,075 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:27,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1806631795] [2020-08-18 22:51:27,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:27,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 22:51:27,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099413826] [2020-08-18 22:51:27,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 22:51:27,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:27,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 22:51:27,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:51:27,078 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-18 22:51:27,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:27,422 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-18 22:51:27,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 22:51:27,422 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-18 22:51:27,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:27,423 INFO L225 Difference]: With dead ends: 66 [2020-08-18 22:51:27,423 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 22:51:27,424 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:51:27,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 22:51:27,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-18 22:51:27,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 22:51:27,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-18 22:51:27,437 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-18 22:51:27,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:27,438 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-18 22:51:27,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 22:51:27,438 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-18 22:51:27,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 22:51:27,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:27,439 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:27,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 22:51:27,439 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:27,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:27,440 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-18 22:51:27,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:27,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480801500] [2020-08-18 22:51:27,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:27,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:27,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:27,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:27,781 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:27,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480801500] [2020-08-18 22:51:27,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:27,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 22:51:27,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055979070] [2020-08-18 22:51:27,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 22:51:27,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:27,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 22:51:27,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:51:27,790 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-18 22:51:28,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:28,207 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-18 22:51:28,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 22:51:28,208 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-18 22:51:28,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:28,209 INFO L225 Difference]: With dead ends: 69 [2020-08-18 22:51:28,209 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 22:51:28,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:51:28,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 22:51:28,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-18 22:51:28,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 22:51:28,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-18 22:51:28,216 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-18 22:51:28,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:28,217 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-18 22:51:28,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 22:51:28,217 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-18 22:51:28,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 22:51:28,217 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:28,218 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:28,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 22:51:28,218 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:28,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:28,218 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-18 22:51:28,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:28,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566518990] [2020-08-18 22:51:28,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:28,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:28,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:28,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:28,569 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:28,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566518990] [2020-08-18 22:51:28,569 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:28,569 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 22:51:28,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839127901] [2020-08-18 22:51:28,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 22:51:28,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:28,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 22:51:28,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:51:28,571 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-18 22:51:29,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:29,086 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-18 22:51:29,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 22:51:29,086 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-18 22:51:29,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:29,087 INFO L225 Difference]: With dead ends: 72 [2020-08-18 22:51:29,087 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 22:51:29,088 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:51:29,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 22:51:29,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-18 22:51:29,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 22:51:29,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-18 22:51:29,095 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-18 22:51:29,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:29,095 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-18 22:51:29,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 22:51:29,095 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-18 22:51:29,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 22:51:29,096 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:29,096 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:29,096 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 22:51:29,096 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:29,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:29,097 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-18 22:51:29,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:29,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1122619282] [2020-08-18 22:51:29,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:29,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:29,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:29,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:29,448 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:29,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1122619282] [2020-08-18 22:51:29,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:29,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 22:51:29,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696234569] [2020-08-18 22:51:29,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 22:51:29,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:29,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 22:51:29,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:51:29,451 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-18 22:51:29,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:29,997 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-18 22:51:29,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 22:51:29,997 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-18 22:51:29,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:29,998 INFO L225 Difference]: With dead ends: 75 [2020-08-18 22:51:29,998 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 22:51:29,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:51:29,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 22:51:30,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-18 22:51:30,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 22:51:30,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-18 22:51:30,014 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-18 22:51:30,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:30,015 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-18 22:51:30,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 22:51:30,015 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-18 22:51:30,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 22:51:30,016 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:30,016 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:30,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 22:51:30,016 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:30,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:30,017 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-18 22:51:30,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:30,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1844369822] [2020-08-18 22:51:30,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:30,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:30,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:30,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:30,433 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:30,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1844369822] [2020-08-18 22:51:30,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:30,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 22:51:30,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239090419] [2020-08-18 22:51:30,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 22:51:30,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:30,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 22:51:30,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:51:30,435 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-18 22:51:31,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:31,042 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-18 22:51:31,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 22:51:31,043 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-18 22:51:31,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:31,045 INFO L225 Difference]: With dead ends: 78 [2020-08-18 22:51:31,045 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 22:51:31,045 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:51:31,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 22:51:31,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-18 22:51:31,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 22:51:31,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-18 22:51:31,052 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-18 22:51:31,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:31,052 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-18 22:51:31,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 22:51:31,052 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-18 22:51:31,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 22:51:31,053 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:31,053 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:31,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 22:51:31,053 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:31,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:31,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-18 22:51:31,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:31,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [71832611] [2020-08-18 22:51:31,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:31,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:31,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:31,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:31,495 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:31,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [71832611] [2020-08-18 22:51:31,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:31,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 22:51:31,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625037531] [2020-08-18 22:51:31,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 22:51:31,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:31,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 22:51:31,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:51:31,497 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-18 22:51:32,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:32,101 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-18 22:51:32,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 22:51:32,104 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-18 22:51:32,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:32,105 INFO L225 Difference]: With dead ends: 81 [2020-08-18 22:51:32,105 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 22:51:32,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:51:32,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 22:51:32,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-18 22:51:32,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 22:51:32,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-18 22:51:32,113 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-18 22:51:32,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:32,113 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-18 22:51:32,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 22:51:32,113 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-18 22:51:32,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 22:51:32,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:32,114 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:32,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 22:51:32,115 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:32,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:32,115 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-18 22:51:32,116 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:32,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1358491047] [2020-08-18 22:51:32,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:32,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:32,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:32,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:32,577 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:32,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1358491047] [2020-08-18 22:51:32,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:32,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 22:51:32,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549951032] [2020-08-18 22:51:32,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 22:51:32,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:32,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 22:51:32,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:51:32,591 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-18 22:51:33,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:33,280 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-18 22:51:33,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 22:51:33,281 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-18 22:51:33,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:33,282 INFO L225 Difference]: With dead ends: 84 [2020-08-18 22:51:33,282 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 22:51:33,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:51:33,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 22:51:33,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-18 22:51:33,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 22:51:33,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-18 22:51:33,292 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-18 22:51:33,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:33,293 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-18 22:51:33,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 22:51:33,293 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-18 22:51:33,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 22:51:33,294 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:33,294 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:33,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 22:51:33,294 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:33,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:33,294 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-18 22:51:33,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:33,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676356192] [2020-08-18 22:51:33,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:33,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:33,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:33,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:33,796 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:33,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676356192] [2020-08-18 22:51:33,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:33,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 22:51:33,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130272572] [2020-08-18 22:51:33,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 22:51:33,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:33,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 22:51:33,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:51:33,799 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-18 22:51:34,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:34,532 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-18 22:51:34,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 22:51:34,533 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-18 22:51:34,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:34,534 INFO L225 Difference]: With dead ends: 87 [2020-08-18 22:51:34,534 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 22:51:34,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:51:34,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 22:51:34,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-18 22:51:34,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 22:51:34,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-18 22:51:34,540 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-18 22:51:34,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:34,541 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-18 22:51:34,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 22:51:34,541 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-18 22:51:34,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 22:51:34,541 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:34,542 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:34,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 22:51:34,542 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:34,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:34,542 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-18 22:51:34,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:34,543 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [253516052] [2020-08-18 22:51:34,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:34,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:35,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:35,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:35,067 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:35,068 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [253516052] [2020-08-18 22:51:35,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:35,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 22:51:35,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672773381] [2020-08-18 22:51:35,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 22:51:35,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:35,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 22:51:35,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:51:35,070 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-18 22:51:35,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:35,859 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-18 22:51:35,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 22:51:35,860 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-18 22:51:35,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:35,861 INFO L225 Difference]: With dead ends: 90 [2020-08-18 22:51:35,861 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 22:51:35,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:51:35,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 22:51:35,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-18 22:51:35,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 22:51:35,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-18 22:51:35,870 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-18 22:51:35,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:35,870 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-18 22:51:35,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 22:51:35,870 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-18 22:51:35,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 22:51:35,871 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:35,871 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:35,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 22:51:35,871 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:35,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:35,872 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-18 22:51:35,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:35,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1903458603] [2020-08-18 22:51:35,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:35,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:36,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:36,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:36,609 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:36,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1903458603] [2020-08-18 22:51:36,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:36,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 22:51:36,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016697237] [2020-08-18 22:51:36,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 22:51:36,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:36,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 22:51:36,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:51:36,613 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-18 22:51:37,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:37,490 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-18 22:51:37,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 22:51:37,490 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-18 22:51:37,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:37,491 INFO L225 Difference]: With dead ends: 93 [2020-08-18 22:51:37,491 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 22:51:37,492 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:51:37,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 22:51:37,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-18 22:51:37,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 22:51:37,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-18 22:51:37,498 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-18 22:51:37,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:37,498 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-18 22:51:37,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 22:51:37,498 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-18 22:51:37,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 22:51:37,499 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:37,499 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:37,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 22:51:37,499 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:37,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:37,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-18 22:51:37,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:37,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1682397913] [2020-08-18 22:51:37,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:37,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:38,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:38,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:38,085 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:38,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1682397913] [2020-08-18 22:51:38,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:38,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 22:51:38,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639079459] [2020-08-18 22:51:38,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 22:51:38,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:38,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 22:51:38,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:51:38,088 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-18 22:51:39,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:39,040 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-18 22:51:39,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 22:51:39,041 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-18 22:51:39,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:39,042 INFO L225 Difference]: With dead ends: 96 [2020-08-18 22:51:39,042 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 22:51:39,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:51:39,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 22:51:39,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-18 22:51:39,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 22:51:39,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-18 22:51:39,049 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-18 22:51:39,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:39,050 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-18 22:51:39,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 22:51:39,050 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-18 22:51:39,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 22:51:39,051 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:39,051 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:39,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 22:51:39,051 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:39,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:39,052 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-18 22:51:39,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:39,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933616812] [2020-08-18 22:51:39,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:39,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:39,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:39,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:39,831 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:39,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933616812] [2020-08-18 22:51:39,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:39,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 22:51:39,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576083158] [2020-08-18 22:51:39,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 22:51:39,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:39,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 22:51:39,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:51:39,833 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-18 22:51:41,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:41,032 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-18 22:51:41,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 22:51:41,033 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-18 22:51:41,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:41,034 INFO L225 Difference]: With dead ends: 99 [2020-08-18 22:51:41,034 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 22:51:41,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:51:41,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 22:51:41,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-18 22:51:41,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-18 22:51:41,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-18 22:51:41,044 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-18 22:51:41,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:41,044 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-18 22:51:41,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 22:51:41,044 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-18 22:51:41,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-18 22:51:41,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:41,045 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:41,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 22:51:41,046 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:41,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:41,046 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-18 22:51:41,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:41,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602201764] [2020-08-18 22:51:41,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:41,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:41,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:41,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:41,774 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:41,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602201764] [2020-08-18 22:51:41,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:41,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 22:51:41,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132690795] [2020-08-18 22:51:41,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 22:51:41,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:41,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 22:51:41,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:51:41,776 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-18 22:51:42,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:42,856 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-18 22:51:42,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 22:51:42,856 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-18 22:51:42,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:42,857 INFO L225 Difference]: With dead ends: 102 [2020-08-18 22:51:42,858 INFO L226 Difference]: Without dead ends: 97 [2020-08-18 22:51:42,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:51:42,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-18 22:51:42,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-18 22:51:42,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 22:51:42,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-18 22:51:42,866 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-18 22:51:42,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:42,867 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-18 22:51:42,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 22:51:42,867 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-18 22:51:42,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 22:51:42,868 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:42,868 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:42,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 22:51:42,868 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:42,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:42,869 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-18 22:51:42,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:42,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733163588] [2020-08-18 22:51:42,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:42,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:43,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:43,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:43,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:43,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733163588] [2020-08-18 22:51:43,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:43,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 22:51:43,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332066415] [2020-08-18 22:51:43,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 22:51:43,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:43,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 22:51:43,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:51:43,587 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-18 22:51:44,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:44,766 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-18 22:51:44,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 22:51:44,767 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-18 22:51:44,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:44,768 INFO L225 Difference]: With dead ends: 105 [2020-08-18 22:51:44,768 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 22:51:44,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:51:44,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 22:51:44,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-18 22:51:44,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-18 22:51:44,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-18 22:51:44,778 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-18 22:51:44,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:44,778 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-18 22:51:44,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 22:51:44,779 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-18 22:51:44,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-18 22:51:44,779 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:44,780 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:44,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 22:51:44,780 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:44,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:44,780 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-18 22:51:44,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:44,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [631657706] [2020-08-18 22:51:44,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:44,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:45,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:45,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:45,588 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:45,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [631657706] [2020-08-18 22:51:45,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:45,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 22:51:45,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355273904] [2020-08-18 22:51:45,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 22:51:45,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:45,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 22:51:45,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:51:45,590 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-18 22:51:46,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:46,814 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-18 22:51:46,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 22:51:46,816 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-18 22:51:46,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:46,817 INFO L225 Difference]: With dead ends: 108 [2020-08-18 22:51:46,817 INFO L226 Difference]: Without dead ends: 103 [2020-08-18 22:51:46,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:51:46,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-18 22:51:46,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-18 22:51:46,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 22:51:46,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-18 22:51:46,826 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-18 22:51:46,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:46,826 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-18 22:51:46,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 22:51:46,826 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-18 22:51:46,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 22:51:46,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:46,827 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:46,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 22:51:46,827 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:46,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:46,828 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-18 22:51:46,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:46,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484925564] [2020-08-18 22:51:46,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:46,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:47,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:47,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:47,622 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:47,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484925564] [2020-08-18 22:51:47,623 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:47,623 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 22:51:47,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439413253] [2020-08-18 22:51:47,624 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 22:51:47,624 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:47,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 22:51:47,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:51:47,625 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-18 22:51:48,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:48,931 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-18 22:51:48,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 22:51:48,937 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-18 22:51:48,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:48,938 INFO L225 Difference]: With dead ends: 111 [2020-08-18 22:51:48,938 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 22:51:48,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:51:48,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 22:51:48,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-18 22:51:48,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-18 22:51:48,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-18 22:51:48,950 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-18 22:51:48,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:48,950 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-18 22:51:48,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 22:51:48,950 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-18 22:51:48,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-18 22:51:48,951 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:48,951 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:48,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 22:51:48,952 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:48,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:48,952 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-18 22:51:48,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:48,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281082454] [2020-08-18 22:51:48,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:48,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:49,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:49,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:49,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:49,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281082454] [2020-08-18 22:51:49,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:49,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 22:51:49,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777746253] [2020-08-18 22:51:49,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 22:51:49,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:49,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 22:51:49,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:51:49,790 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-18 22:51:51,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:51,164 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-18 22:51:51,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 22:51:51,165 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-18 22:51:51,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:51,166 INFO L225 Difference]: With dead ends: 114 [2020-08-18 22:51:51,166 INFO L226 Difference]: Without dead ends: 109 [2020-08-18 22:51:51,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:51:51,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-18 22:51:51,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-18 22:51:51,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 22:51:51,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-18 22:51:51,176 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-18 22:51:51,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:51,177 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-18 22:51:51,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 22:51:51,177 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-18 22:51:51,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-18 22:51:51,178 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:51,178 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:51,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 22:51:51,178 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:51,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:51,179 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-18 22:51:51,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:51,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1381066188] [2020-08-18 22:51:51,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:51,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:52,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:52,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:52,136 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:52,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1381066188] [2020-08-18 22:51:52,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:52,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 22:51:52,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014493190] [2020-08-18 22:51:52,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 22:51:52,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:52,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 22:51:52,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:51:52,138 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-18 22:51:53,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:53,720 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-18 22:51:53,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 22:51:53,721 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-18 22:51:53,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:53,722 INFO L225 Difference]: With dead ends: 117 [2020-08-18 22:51:53,722 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 22:51:53,723 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:51:53,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 22:51:53,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-18 22:51:53,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-18 22:51:53,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-18 22:51:53,731 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-18 22:51:53,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:53,731 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-18 22:51:53,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 22:51:53,732 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-18 22:51:53,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-18 22:51:53,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:53,733 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:53,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 22:51:53,733 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:53,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:53,733 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-18 22:51:53,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:53,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1592461267] [2020-08-18 22:51:53,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:53,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:54,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:54,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:54,689 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:54,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1592461267] [2020-08-18 22:51:54,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:54,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 22:51:54,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105525643] [2020-08-18 22:51:54,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 22:51:54,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:54,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 22:51:54,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:51:54,691 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-18 22:51:56,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:56,396 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-18 22:51:56,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 22:51:56,396 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-18 22:51:56,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:56,398 INFO L225 Difference]: With dead ends: 120 [2020-08-18 22:51:56,398 INFO L226 Difference]: Without dead ends: 115 [2020-08-18 22:51:56,400 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:51:56,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-18 22:51:56,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-18 22:51:56,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-18 22:51:56,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-18 22:51:56,408 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-18 22:51:56,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:56,409 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-18 22:51:56,409 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 22:51:56,409 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-18 22:51:56,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-18 22:51:56,410 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:56,410 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:56,410 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 22:51:56,410 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:56,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:56,411 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-18 22:51:56,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:56,411 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [361827716] [2020-08-18 22:51:56,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:56,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:57,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:51:57,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:51:57,456 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:51:57,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [361827716] [2020-08-18 22:51:57,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:51:57,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 22:51:57,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821026760] [2020-08-18 22:51:57,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 22:51:57,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:51:57,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 22:51:57,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:51:57,459 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-18 22:51:59,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:51:59,208 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-18 22:51:59,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 22:51:59,209 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-18 22:51:59,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:51:59,210 INFO L225 Difference]: With dead ends: 123 [2020-08-18 22:51:59,211 INFO L226 Difference]: Without dead ends: 118 [2020-08-18 22:51:59,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:51:59,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-18 22:51:59,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-18 22:51:59,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-18 22:51:59,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-18 22:51:59,222 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-18 22:51:59,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:51:59,222 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-18 22:51:59,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 22:51:59,223 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-18 22:51:59,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-18 22:51:59,224 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:51:59,224 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:51:59,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 22:51:59,224 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:51:59,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:51:59,225 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-18 22:51:59,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:51:59,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1003381555] [2020-08-18 22:51:59,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:51:59,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:00,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:52:00,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:00,326 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:52:00,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1003381555] [2020-08-18 22:52:00,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:52:00,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 22:52:00,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626207165] [2020-08-18 22:52:00,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 22:52:00,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:52:00,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 22:52:00,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:52:00,328 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-18 22:52:02,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:52:02,186 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-18 22:52:02,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 22:52:02,186 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-18 22:52:02,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:52:02,188 INFO L225 Difference]: With dead ends: 126 [2020-08-18 22:52:02,188 INFO L226 Difference]: Without dead ends: 121 [2020-08-18 22:52:02,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:52:02,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-18 22:52:02,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-18 22:52:02,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-18 22:52:02,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-18 22:52:02,206 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-18 22:52:02,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:52:02,206 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-18 22:52:02,206 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 22:52:02,206 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-18 22:52:02,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-18 22:52:02,207 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:52:02,207 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:52:02,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 22:52:02,207 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:52:02,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:52:02,208 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-18 22:52:02,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:52:02,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1690485302] [2020-08-18 22:52:02,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:52:02,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:03,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:52:03,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:03,351 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:52:03,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1690485302] [2020-08-18 22:52:03,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:52:03,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 22:52:03,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134536408] [2020-08-18 22:52:03,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 22:52:03,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:52:03,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 22:52:03,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:52:03,356 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-18 22:52:05,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:52:05,296 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-18 22:52:05,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 22:52:05,297 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-18 22:52:05,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:52:05,298 INFO L225 Difference]: With dead ends: 129 [2020-08-18 22:52:05,299 INFO L226 Difference]: Without dead ends: 124 [2020-08-18 22:52:05,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 22:52:05,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-18 22:52:05,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-18 22:52:05,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-18 22:52:05,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-18 22:52:05,310 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-18 22:52:05,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:52:05,310 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-18 22:52:05,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 22:52:05,311 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-18 22:52:05,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-18 22:52:05,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:52:05,311 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:52:05,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 22:52:05,311 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:52:05,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:52:05,312 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-18 22:52:05,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:52:05,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199606733] [2020-08-18 22:52:05,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:52:05,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:06,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:52:06,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:06,522 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:52:06,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199606733] [2020-08-18 22:52:06,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:52:06,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 22:52:06,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814929828] [2020-08-18 22:52:06,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 22:52:06,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:52:06,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 22:52:06,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 22:52:06,524 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-18 22:52:08,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:52:08,685 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-18 22:52:08,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 22:52:08,686 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-18 22:52:08,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:52:08,688 INFO L225 Difference]: With dead ends: 132 [2020-08-18 22:52:08,688 INFO L226 Difference]: Without dead ends: 127 [2020-08-18 22:52:08,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 22:52:08,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-18 22:52:08,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-18 22:52:08,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-18 22:52:08,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-18 22:52:08,700 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-18 22:52:08,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:52:08,701 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-18 22:52:08,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 22:52:08,701 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-18 22:52:08,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-18 22:52:08,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:52:08,702 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:52:08,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 22:52:08,702 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:52:08,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:52:08,703 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-18 22:52:08,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:52:08,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300273766] [2020-08-18 22:52:08,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:52:08,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:09,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:52:09,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:10,004 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:52:10,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300273766] [2020-08-18 22:52:10,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:52:10,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 22:52:10,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231469605] [2020-08-18 22:52:10,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 22:52:10,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:52:10,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 22:52:10,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 22:52:10,006 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-18 22:52:12,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:52:12,237 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-18 22:52:12,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 22:52:12,237 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-18 22:52:12,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:52:12,239 INFO L225 Difference]: With dead ends: 135 [2020-08-18 22:52:12,239 INFO L226 Difference]: Without dead ends: 130 [2020-08-18 22:52:12,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 22:52:12,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-18 22:52:12,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-18 22:52:12,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-18 22:52:12,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-18 22:52:12,253 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-18 22:52:12,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:52:12,254 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-18 22:52:12,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 22:52:12,254 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-18 22:52:12,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-18 22:52:12,255 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:52:12,255 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:52:12,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 22:52:12,255 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:52:12,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:52:12,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-18 22:52:12,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:52:12,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1296449178] [2020-08-18 22:52:12,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:52:12,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:13,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:52:13,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:13,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:52:13,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1296449178] [2020-08-18 22:52:13,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:52:13,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 22:52:13,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990028064] [2020-08-18 22:52:13,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 22:52:13,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:52:13,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 22:52:13,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 22:52:13,658 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-18 22:52:16,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:52:16,028 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-18 22:52:16,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 22:52:16,028 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-18 22:52:16,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:52:16,030 INFO L225 Difference]: With dead ends: 138 [2020-08-18 22:52:16,030 INFO L226 Difference]: Without dead ends: 133 [2020-08-18 22:52:16,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 22:52:16,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-18 22:52:16,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-18 22:52:16,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-18 22:52:16,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-18 22:52:16,043 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-18 22:52:16,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:52:16,044 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-18 22:52:16,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 22:52:16,044 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-18 22:52:16,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-18 22:52:16,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:52:16,045 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:52:16,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 22:52:16,045 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:52:16,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:52:16,046 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-18 22:52:16,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:52:16,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657753970] [2020-08-18 22:52:16,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:52:16,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:17,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:52:17,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:17,505 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 0 proven. 2460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:52:17,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657753970] [2020-08-18 22:52:17,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:52:17,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 22:52:17,506 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292880188] [2020-08-18 22:52:17,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 22:52:17,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:52:17,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 22:52:17,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 22:52:17,507 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states. [2020-08-18 22:52:20,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:52:20,015 INFO L93 Difference]: Finished difference Result 141 states and 183 transitions. [2020-08-18 22:52:20,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 22:52:20,015 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 132 [2020-08-18 22:52:20,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:52:20,017 INFO L225 Difference]: With dead ends: 141 [2020-08-18 22:52:20,017 INFO L226 Difference]: Without dead ends: 136 [2020-08-18 22:52:20,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=91, Invalid=1979, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 22:52:20,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-08-18 22:52:20,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2020-08-18 22:52:20,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-08-18 22:52:20,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 178 transitions. [2020-08-18 22:52:20,030 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 178 transitions. Word has length 132 [2020-08-18 22:52:20,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:52:20,030 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 178 transitions. [2020-08-18 22:52:20,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 22:52:20,031 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 178 transitions. [2020-08-18 22:52:20,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-08-18 22:52:20,031 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:52:20,031 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:52:20,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 22:52:20,031 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:52:20,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:52:20,032 INFO L82 PathProgramCache]: Analyzing trace with hash 224269993, now seen corresponding path program 41 times [2020-08-18 22:52:20,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:52:20,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1786729916] [2020-08-18 22:52:20,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY