/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=BIGGEST -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 18:01:11,925 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 18:01:11,928 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 18:01:11,950 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 18:01:11,960 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 18:01:11,960 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 18:01:11,961 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 18:01:11,962 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 18:01:11,963 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 18:01:11,964 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 18:01:11,966 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 18:01:11,967 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 18:01:11,969 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 18:01:11,970 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 18:01:11,971 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 18:01:11,972 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 18:01:11,974 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 18:01:11,982 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 18:01:11,983 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 18:01:11,983 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 18:01:11,985 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 18:01:12,012 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 18:01:12,012 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 18:01:12,014 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 18:01:12,014 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 18:01:12,014 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 18:01:12,014 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 18:01:12,014 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 18:01:12,015 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 18:01:12,015 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 18:01:12,015 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 18:01:12,015 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 18:01:12,015 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 18:01:12,016 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 18:01:12,016 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 18:01:12,016 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 18:01:12,016 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 18:01:12,016 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 18:01:12,017 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 18:01:12,017 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 18:01:12,017 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 18:01:12,017 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 18:01:12,017 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:01:12,018 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 18:01:12,018 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 18:01:12,018 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 18:01:12,018 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 18:01:12,018 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 18:01:12,019 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 18:01:12,019 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 18:01:12,019 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=BIGGEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=BIGGEST; [2020-08-18 18:01:12,329 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 18:01:12,346 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 18:01:12,351 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 18:01:12,352 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 18:01:12,353 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 18:01:12,353 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 18:01:12,412 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/080eb37ac/fda9c69d2c5243888abd08a5c03da259/FLAGb2ba35766 [2020-08-18 18:01:12,886 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 18:01:12,887 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 18:01:12,893 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/080eb37ac/fda9c69d2c5243888abd08a5c03da259/FLAGb2ba35766 [2020-08-18 18:01:13,312 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/080eb37ac/fda9c69d2c5243888abd08a5c03da259 [2020-08-18 18:01:13,322 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 18:01:13,323 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 18:01:13,324 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 18:01:13,325 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 18:01:13,328 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 18:01:13,329 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:01:13" (1/1) ... [2020-08-18 18:01:13,332 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@31fe14eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:01:13, skipping insertion in model container [2020-08-18 18:01:13,333 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:01:13" (1/1) ... [2020-08-18 18:01:13,341 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 18:01:13,358 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 18:01:13,524 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:01:13,528 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 18:01:13,545 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:01:13,560 INFO L208 MainTranslator]: Completed translation [2020-08-18 18:01:13,560 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:01:13 WrapperNode [2020-08-18 18:01:13,561 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 18:01:13,561 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 18:01:13,562 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 18:01:13,562 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 18:01:13,575 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:01:13" (1/1) ... [2020-08-18 18:01:13,576 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:01:13" (1/1) ... [2020-08-18 18:01:13,658 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:01:13" (1/1) ... [2020-08-18 18:01:13,658 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:01:13" (1/1) ... [2020-08-18 18:01:13,663 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:01:13" (1/1) ... [2020-08-18 18:01:13,669 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:01:13" (1/1) ... [2020-08-18 18:01:13,670 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:01:13" (1/1) ... [2020-08-18 18:01:13,672 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 18:01:13,673 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 18:01:13,673 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 18:01:13,673 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 18:01:13,674 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:01:13" (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 18:01:13,727 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 18:01:13,728 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 18:01:13,728 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 18:01:13,728 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 18:01:13,728 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 18:01:13,728 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 18:01:13,728 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 18:01:13,729 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 18:01:13,729 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 18:01:13,729 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 18:01:13,729 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 18:01:13,729 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 18:01:13,729 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 18:01:13,909 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 18:01:13,910 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 18:01:13,913 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:01:13 BoogieIcfgContainer [2020-08-18 18:01:13,913 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 18:01:13,915 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 18:01:13,915 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 18:01:13,918 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 18:01:13,918 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:01:13" (1/3) ... [2020-08-18 18:01:13,919 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68a9c0fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:01:13, skipping insertion in model container [2020-08-18 18:01:13,919 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:01:13" (2/3) ... [2020-08-18 18:01:13,922 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68a9c0fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:01:13, skipping insertion in model container [2020-08-18 18:01:13,922 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:01:13" (3/3) ... [2020-08-18 18:01:13,924 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-18 18:01:13,933 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 18:01:13,940 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 18:01:13,952 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 18:01:13,972 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 18:01:13,972 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 18:01:13,972 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 18:01:13,972 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 18:01:13,972 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 18:01:13,972 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 18:01:13,972 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 18:01:13,973 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 18:01:13,986 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-18 18:01:13,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 18:01:13,994 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:13,996 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:13,996 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:14,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:14,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-18 18:01:14,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:14,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331580759] [2020-08-18 18:01:14,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:14,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:14,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:14,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:14,104 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 18:01:14,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331580759] [2020-08-18 18:01:14,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:01:14,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 18:01:14,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017827509] [2020-08-18 18:01:14,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 18:01:14,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:14,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 18:01:14,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 18:01:14,129 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-18 18:01:14,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:14,152 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-18 18:01:14,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 18:01:14,154 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 18:01:14,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:14,162 INFO L225 Difference]: With dead ends: 32 [2020-08-18 18:01:14,163 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 18:01:14,167 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 18:01:14,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 18:01:14,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 18:01:14,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 18:01:14,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-18 18:01:14,206 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-18 18:01:14,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:14,207 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-18 18:01:14,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 18:01:14,207 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-18 18:01:14,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 18:01:14,208 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:14,208 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:14,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 18:01:14,209 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:14,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:14,209 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-18 18:01:14,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:14,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1622660793] [2020-08-18 18:01:14,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:14,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:14,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:14,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:14,331 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 18:01:14,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1622660793] [2020-08-18 18:01:14,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:01:14,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 18:01:14,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581297755] [2020-08-18 18:01:14,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 18:01:14,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:14,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 18:01:14,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:01:14,342 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-18 18:01:14,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:14,439 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-18 18:01:14,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:01:14,442 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 18:01:14,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:14,444 INFO L225 Difference]: With dead ends: 21 [2020-08-18 18:01:14,444 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 18:01:14,446 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 18:01:14,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 18:01:14,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 18:01:14,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 18:01:14,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 18:01:14,454 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-18 18:01:14,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:14,455 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 18:01:14,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 18:01:14,455 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 18:01:14,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 18:01:14,461 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:14,461 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:14,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 18:01:14,461 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:14,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:14,462 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-18 18:01:14,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:14,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1447267649] [2020-08-18 18:01:14,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:14,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:14,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:14,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:14,593 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 18:01:14,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1447267649] [2020-08-18 18:01:14,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:14,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 18:01:14,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511422213] [2020-08-18 18:01:14,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 18:01:14,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:14,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 18:01:14,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:01:14,597 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-18 18:01:14,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:14,665 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 18:01:14,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 18:01:14,666 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-18 18:01:14,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:14,667 INFO L225 Difference]: With dead ends: 24 [2020-08-18 18:01:14,667 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 18:01:14,668 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 18:01:14,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 18:01:14,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 18:01:14,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 18:01:14,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-18 18:01:14,674 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-18 18:01:14,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:14,674 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-18 18:01:14,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 18:01:14,675 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-18 18:01:14,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 18:01:14,676 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:14,676 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:14,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 18:01:14,676 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:14,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:14,677 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-18 18:01:14,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:14,678 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007858739] [2020-08-18 18:01:14,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:14,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:14,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:14,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:14,791 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 18:01:14,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007858739] [2020-08-18 18:01:14,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:14,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 18:01:14,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411599328] [2020-08-18 18:01:14,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 18:01:14,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:14,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 18:01:14,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:01:14,794 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-18 18:01:14,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:14,869 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-18 18:01:14,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 18:01:14,870 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 18:01:14,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:14,871 INFO L225 Difference]: With dead ends: 27 [2020-08-18 18:01:14,871 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 18:01:14,872 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 18:01:14,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 18:01:14,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 18:01:14,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 18:01:14,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-18 18:01:14,878 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-18 18:01:14,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:14,879 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-18 18:01:14,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 18:01:14,879 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-18 18:01:14,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 18:01:14,880 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:14,880 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:14,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 18:01:14,881 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:14,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:14,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-18 18:01:14,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:14,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1986165885] [2020-08-18 18:01:14,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:14,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:15,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:15,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:15,018 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 18:01:15,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1986165885] [2020-08-18 18:01:15,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:15,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 18:01:15,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340903477] [2020-08-18 18:01:15,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 18:01:15,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:15,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 18:01:15,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:01:15,021 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-18 18:01:15,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:15,113 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-18 18:01:15,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 18:01:15,114 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-18 18:01:15,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:15,115 INFO L225 Difference]: With dead ends: 30 [2020-08-18 18:01:15,115 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 18:01:15,116 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 18:01:15,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 18:01:15,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 18:01:15,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 18:01:15,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-18 18:01:15,122 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-18 18:01:15,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:15,123 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-18 18:01:15,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 18:01:15,123 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-18 18:01:15,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 18:01:15,124 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:15,124 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:15,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 18:01:15,124 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:15,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:15,125 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-18 18:01:15,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:15,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [322405576] [2020-08-18 18:01:15,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:15,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:15,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:15,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:15,237 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 18:01:15,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [322405576] [2020-08-18 18:01:15,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:15,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 18:01:15,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375087067] [2020-08-18 18:01:15,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 18:01:15,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:15,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 18:01:15,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 18:01:15,240 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-18 18:01:15,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:15,329 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-18 18:01:15,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 18:01:15,330 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-18 18:01:15,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:15,331 INFO L225 Difference]: With dead ends: 33 [2020-08-18 18:01:15,332 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 18:01:15,332 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 18:01:15,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 18:01:15,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 18:01:15,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 18:01:15,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-18 18:01:15,339 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-18 18:01:15,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:15,340 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-18 18:01:15,340 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 18:01:15,340 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-18 18:01:15,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 18:01:15,341 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:15,341 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:15,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 18:01:15,342 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:15,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:15,342 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-18 18:01:15,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:15,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921920992] [2020-08-18 18:01:15,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:15,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:15,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:15,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:15,502 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 18:01:15,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921920992] [2020-08-18 18:01:15,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:15,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 18:01:15,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757257861] [2020-08-18 18:01:15,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 18:01:15,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:15,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 18:01:15,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:01:15,504 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-18 18:01:15,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:15,603 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-18 18:01:15,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 18:01:15,604 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 18:01:15,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:15,605 INFO L225 Difference]: With dead ends: 36 [2020-08-18 18:01:15,605 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 18:01:15,606 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 18:01:15,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 18:01:15,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 18:01:15,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 18:01:15,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-18 18:01:15,612 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-18 18:01:15,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:15,613 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-18 18:01:15,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 18:01:15,613 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-18 18:01:15,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 18:01:15,614 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:15,614 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:15,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 18:01:15,615 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:15,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:15,615 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-18 18:01:15,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:15,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [486358211] [2020-08-18 18:01:15,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:15,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:15,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:15,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:15,739 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 18:01:15,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [486358211] [2020-08-18 18:01:15,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:15,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 18:01:15,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495436899] [2020-08-18 18:01:15,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 18:01:15,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:15,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 18:01:15,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 18:01:15,742 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-18 18:01:15,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:15,877 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-18 18:01:15,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 18:01:15,877 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 18:01:15,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:15,879 INFO L225 Difference]: With dead ends: 39 [2020-08-18 18:01:15,879 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 18:01:15,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:01:15,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 18:01:15,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 18:01:15,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 18:01:15,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-18 18:01:15,887 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-18 18:01:15,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:15,887 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-18 18:01:15,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 18:01:15,888 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-18 18:01:15,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 18:01:15,889 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:15,889 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:15,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 18:01:15,890 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:15,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:15,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-18 18:01:15,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:15,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1182904160] [2020-08-18 18:01:15,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:15,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:16,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:16,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:16,044 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 18:01:16,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1182904160] [2020-08-18 18:01:16,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:16,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 18:01:16,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639757926] [2020-08-18 18:01:16,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 18:01:16,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:16,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 18:01:16,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:01:16,047 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-18 18:01:16,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:16,210 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-18 18:01:16,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 18:01:16,210 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-18 18:01:16,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:16,211 INFO L225 Difference]: With dead ends: 42 [2020-08-18 18:01:16,212 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 18:01:16,212 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 18:01:16,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 18:01:16,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 18:01:16,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 18:01:16,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-18 18:01:16,219 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-18 18:01:16,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:16,219 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-18 18:01:16,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 18:01:16,220 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-18 18:01:16,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 18:01:16,221 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:16,221 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:16,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 18:01:16,221 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:16,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:16,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-18 18:01:16,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:16,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [133707776] [2020-08-18 18:01:16,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:16,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:16,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:16,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:16,391 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 18:01:16,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [133707776] [2020-08-18 18:01:16,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:16,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 18:01:16,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235706878] [2020-08-18 18:01:16,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 18:01:16,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:16,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 18:01:16,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 18:01:16,394 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-18 18:01:16,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:16,551 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-18 18:01:16,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 18:01:16,551 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 18:01:16,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:16,552 INFO L225 Difference]: With dead ends: 45 [2020-08-18 18:01:16,552 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 18:01:16,553 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 18:01:16,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 18:01:16,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 18:01:16,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 18:01:16,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-18 18:01:16,559 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-18 18:01:16,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:16,560 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-18 18:01:16,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 18:01:16,560 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-18 18:01:16,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 18:01:16,561 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:16,561 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:16,561 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 18:01:16,562 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:16,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:16,562 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-18 18:01:16,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:16,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1553503272] [2020-08-18 18:01:16,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:16,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:16,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:16,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:16,762 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 18:01:16,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1553503272] [2020-08-18 18:01:16,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:16,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 18:01:16,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789784583] [2020-08-18 18:01:16,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 18:01:16,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:16,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 18:01:16,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-18 18:01:16,764 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-18 18:01:16,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:16,944 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-18 18:01:16,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 18:01:16,945 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-18 18:01:16,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:16,946 INFO L225 Difference]: With dead ends: 48 [2020-08-18 18:01:16,946 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 18:01:16,946 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 18:01:16,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 18:01:16,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 18:01:16,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 18:01:16,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-18 18:01:16,952 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-18 18:01:16,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:16,953 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-18 18:01:16,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 18:01:16,953 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-18 18:01:16,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 18:01:16,954 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:16,954 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:16,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 18:01:16,955 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:16,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:16,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-18 18:01:16,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:16,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [528802645] [2020-08-18 18:01:16,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:16,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:17,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:17,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:17,132 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 18:01:17,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [528802645] [2020-08-18 18:01:17,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:17,133 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 18:01:17,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171141390] [2020-08-18 18:01:17,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 18:01:17,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:17,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 18:01:17,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 18:01:17,135 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-18 18:01:17,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:17,413 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-18 18:01:17,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 18:01:17,413 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-18 18:01:17,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:17,414 INFO L225 Difference]: With dead ends: 51 [2020-08-18 18:01:17,414 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 18:01:17,415 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 18:01:17,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 18:01:17,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 18:01:17,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 18:01:17,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-18 18:01:17,421 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-18 18:01:17,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:17,421 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-18 18:01:17,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 18:01:17,422 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-18 18:01:17,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 18:01:17,423 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:17,423 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:17,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 18:01:17,423 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:17,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:17,423 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-18 18:01:17,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:17,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [329727282] [2020-08-18 18:01:17,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:17,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:17,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:17,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:17,620 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 18:01:17,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [329727282] [2020-08-18 18:01:17,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:17,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 18:01:17,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061643498] [2020-08-18 18:01:17,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 18:01:17,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:17,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 18:01:17,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:01:17,622 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-18 18:01:17,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:17,939 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-18 18:01:17,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 18:01:17,940 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-18 18:01:17,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:17,940 INFO L225 Difference]: With dead ends: 54 [2020-08-18 18:01:17,941 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 18:01:17,941 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 18:01:17,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 18:01:17,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 18:01:17,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 18:01:17,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-18 18:01:17,952 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-18 18:01:17,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:17,952 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-18 18:01:17,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 18:01:17,952 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-18 18:01:17,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 18:01:17,953 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:17,953 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:17,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 18:01:17,954 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:17,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:17,954 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-18 18:01:17,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:17,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1868823797] [2020-08-18 18:01:17,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:17,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:18,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:18,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:18,220 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 18:01:18,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1868823797] [2020-08-18 18:01:18,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:18,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 18:01:18,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625236944] [2020-08-18 18:01:18,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 18:01:18,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:18,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 18:01:18,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 18:01:18,223 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-18 18:01:18,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:18,538 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-18 18:01:18,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 18:01:18,539 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 18:01:18,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:18,539 INFO L225 Difference]: With dead ends: 57 [2020-08-18 18:01:18,540 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 18:01:18,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:01:18,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 18:01:18,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 18:01:18,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 18:01:18,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-18 18:01:18,554 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-18 18:01:18,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:18,555 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-18 18:01:18,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 18:01:18,555 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-18 18:01:18,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 18:01:18,559 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:18,559 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:18,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 18:01:18,560 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:18,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:18,560 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-18 18:01:18,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:18,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563787587] [2020-08-18 18:01:18,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:18,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:18,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:18,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:18,858 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 18:01:18,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563787587] [2020-08-18 18:01:18,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:18,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 18:01:18,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248401965] [2020-08-18 18:01:18,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 18:01:18,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:18,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 18:01:18,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:01:18,861 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-18 18:01:19,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:19,199 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-18 18:01:19,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 18:01:19,200 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-18 18:01:19,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:19,201 INFO L225 Difference]: With dead ends: 60 [2020-08-18 18:01:19,201 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 18:01:19,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:01:19,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 18:01:19,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 18:01:19,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 18:01:19,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-18 18:01:19,220 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-18 18:01:19,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:19,220 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-18 18:01:19,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 18:01:19,220 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-18 18:01:19,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 18:01:19,221 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:19,221 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:19,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 18:01:19,222 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:19,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:19,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-18 18:01:19,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:19,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1063703264] [2020-08-18 18:01:19,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:19,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:19,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:19,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:19,494 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 18:01:19,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1063703264] [2020-08-18 18:01:19,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:19,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 18:01:19,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652491084] [2020-08-18 18:01:19,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 18:01:19,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:19,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 18:01:19,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 18:01:19,499 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-18 18:01:19,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:19,867 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-18 18:01:19,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 18:01:19,867 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-18 18:01:19,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:19,868 INFO L225 Difference]: With dead ends: 63 [2020-08-18 18:01:19,868 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 18:01:19,869 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 18:01:19,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 18:01:19,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 18:01:19,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 18:01:19,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-18 18:01:19,883 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-18 18:01:19,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:19,884 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-18 18:01:19,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 18:01:19,884 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-18 18:01:19,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 18:01:19,884 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:19,888 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:19,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 18:01:19,888 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:19,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:19,889 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-18 18:01:19,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:19,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [591285330] [2020-08-18 18:01:19,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:19,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:20,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:20,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:20,170 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 18:01:20,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [591285330] [2020-08-18 18:01:20,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:20,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 18:01:20,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794689171] [2020-08-18 18:01:20,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 18:01:20,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:20,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 18:01:20,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-18 18:01:20,172 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-18 18:01:20,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:20,600 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-18 18:01:20,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 18:01:20,600 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-18 18:01:20,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:20,601 INFO L225 Difference]: With dead ends: 66 [2020-08-18 18:01:20,601 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 18:01:20,602 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 18:01:20,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 18:01:20,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-18 18:01:20,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 18:01:20,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-18 18:01:20,617 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-18 18:01:20,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:20,618 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-18 18:01:20,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 18:01:20,618 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-18 18:01:20,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 18:01:20,619 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:20,619 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:20,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 18:01:20,619 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:20,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:20,620 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-18 18:01:20,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:20,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [577213829] [2020-08-18 18:01:20,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:20,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:20,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:20,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:20,926 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 18:01:20,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [577213829] [2020-08-18 18:01:20,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:20,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 18:01:20,928 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122152635] [2020-08-18 18:01:20,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 18:01:20,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:20,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 18:01:20,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:01:20,935 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-18 18:01:21,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:21,403 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-18 18:01:21,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 18:01:21,403 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-18 18:01:21,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:21,404 INFO L225 Difference]: With dead ends: 69 [2020-08-18 18:01:21,405 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 18:01:21,406 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 18:01:21,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 18:01:21,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-18 18:01:21,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 18:01:21,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-18 18:01:21,412 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-18 18:01:21,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:21,413 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-18 18:01:21,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 18:01:21,413 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-18 18:01:21,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 18:01:21,414 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:21,414 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:21,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 18:01:21,414 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:21,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:21,415 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-18 18:01:21,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:21,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694030661] [2020-08-18 18:01:21,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:21,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:21,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:21,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:21,742 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 18:01:21,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1694030661] [2020-08-18 18:01:21,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:21,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 18:01:21,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490231437] [2020-08-18 18:01:21,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 18:01:21,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:21,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 18:01:21,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-18 18:01:21,744 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-18 18:01:22,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:22,207 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-18 18:01:22,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 18:01:22,208 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-18 18:01:22,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:22,209 INFO L225 Difference]: With dead ends: 72 [2020-08-18 18:01:22,209 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 18:01:22,209 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 18:01:22,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 18:01:22,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-18 18:01:22,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 18:01:22,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-18 18:01:22,215 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-18 18:01:22,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:22,216 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-18 18:01:22,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 18:01:22,216 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-18 18:01:22,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 18:01:22,217 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:22,217 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:22,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 18:01:22,217 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:22,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:22,218 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-18 18:01:22,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:22,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233777762] [2020-08-18 18:01:22,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:22,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:22,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:22,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:22,596 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 18:01:22,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233777762] [2020-08-18 18:01:22,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:22,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 18:01:22,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591314283] [2020-08-18 18:01:22,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 18:01:22,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:22,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 18:01:22,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 18:01:22,598 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-18 18:01:23,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:23,201 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-18 18:01:23,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 18:01:23,202 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-18 18:01:23,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:23,203 INFO L225 Difference]: With dead ends: 75 [2020-08-18 18:01:23,203 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 18:01:23,204 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 18:01:23,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 18:01:23,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-18 18:01:23,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 18:01:23,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-18 18:01:23,219 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-18 18:01:23,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:23,219 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-18 18:01:23,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 18:01:23,220 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-18 18:01:23,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 18:01:23,221 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:23,221 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:23,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 18:01:23,221 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:23,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:23,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-18 18:01:23,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:23,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377031516] [2020-08-18 18:01:23,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:23,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:23,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:23,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:23,671 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 18:01:23,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377031516] [2020-08-18 18:01:23,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:23,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 18:01:23,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689947981] [2020-08-18 18:01:23,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 18:01:23,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:23,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 18:01:23,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-18 18:01:23,674 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-18 18:01:24,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:24,237 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-18 18:01:24,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 18:01:24,238 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-18 18:01:24,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:24,239 INFO L225 Difference]: With dead ends: 78 [2020-08-18 18:01:24,239 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 18:01:24,240 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 18:01:24,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 18:01:24,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-18 18:01:24,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 18:01:24,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-18 18:01:24,251 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-18 18:01:24,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:24,251 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-18 18:01:24,251 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 18:01:24,252 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-18 18:01:24,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 18:01:24,252 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:24,252 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:24,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 18:01:24,253 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:24,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:24,253 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-18 18:01:24,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:24,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352023276] [2020-08-18 18:01:24,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:24,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:24,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:24,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:24,658 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 18:01:24,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352023276] [2020-08-18 18:01:24,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:24,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 18:01:24,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789585803] [2020-08-18 18:01:24,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 18:01:24,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:24,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 18:01:24,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 18:01:24,662 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-18 18:01:25,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:25,297 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-18 18:01:25,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 18:01:25,300 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-18 18:01:25,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:25,301 INFO L225 Difference]: With dead ends: 81 [2020-08-18 18:01:25,301 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 18:01:25,302 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 18:01:25,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 18:01:25,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-18 18:01:25,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 18:01:25,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-18 18:01:25,308 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-18 18:01:25,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:25,308 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-18 18:01:25,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 18:01:25,308 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-18 18:01:25,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 18:01:25,309 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:25,309 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:25,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 18:01:25,309 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:25,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:25,310 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-18 18:01:25,310 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:25,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [311290009] [2020-08-18 18:01:25,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:25,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:25,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:25,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:25,796 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 18:01:25,797 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [311290009] [2020-08-18 18:01:25,797 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:25,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 18:01:25,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129617320] [2020-08-18 18:01:25,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 18:01:25,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:25,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 18:01:25,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-18 18:01:25,799 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-18 18:01:26,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:26,562 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-18 18:01:26,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 18:01:26,563 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-18 18:01:26,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:26,564 INFO L225 Difference]: With dead ends: 84 [2020-08-18 18:01:26,564 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 18:01:26,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:01:26,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 18:01:26,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-18 18:01:26,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 18:01:26,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-18 18:01:26,572 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-18 18:01:26,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:26,573 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-18 18:01:26,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 18:01:26,573 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-18 18:01:26,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 18:01:26,574 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:26,574 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:26,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 18:01:26,574 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:26,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:26,575 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-18 18:01:26,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:26,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1870712977] [2020-08-18 18:01:26,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:26,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:27,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:27,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:27,078 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 18:01:27,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1870712977] [2020-08-18 18:01:27,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:27,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 18:01:27,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428146643] [2020-08-18 18:01:27,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 18:01:27,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:27,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 18:01:27,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 18:01:27,080 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-18 18:01:27,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:27,873 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-18 18:01:27,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 18:01:27,874 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-18 18:01:27,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:27,875 INFO L225 Difference]: With dead ends: 87 [2020-08-18 18:01:27,875 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 18:01:27,876 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 18:01:27,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 18:01:27,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-18 18:01:27,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 18:01:27,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-18 18:01:27,882 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-18 18:01:27,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:27,883 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-18 18:01:27,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 18:01:27,883 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-18 18:01:27,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 18:01:27,884 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:27,884 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:27,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 18:01:27,887 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:27,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:27,888 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-18 18:01:27,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:27,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [209497217] [2020-08-18 18:01:27,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:27,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:28,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:28,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:28,428 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 18:01:28,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [209497217] [2020-08-18 18:01:28,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:28,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 18:01:28,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158978304] [2020-08-18 18:01:28,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 18:01:28,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:28,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 18:01:28,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-18 18:01:28,431 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-18 18:01:29,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:29,305 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-18 18:01:29,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 18:01:29,306 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-18 18:01:29,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:29,307 INFO L225 Difference]: With dead ends: 90 [2020-08-18 18:01:29,307 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 18:01:29,308 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 18:01:29,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 18:01:29,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-18 18:01:29,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 18:01:29,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-18 18:01:29,315 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-18 18:01:29,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:29,315 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-18 18:01:29,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 18:01:29,315 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-18 18:01:29,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 18:01:29,316 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:29,316 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:29,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 18:01:29,316 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:29,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:29,317 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-18 18:01:29,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:29,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [535443466] [2020-08-18 18:01:29,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:29,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:29,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:29,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:29,991 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 18:01:29,992 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [535443466] [2020-08-18 18:01:29,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:29,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 18:01:29,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233073759] [2020-08-18 18:01:29,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 18:01:29,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:29,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 18:01:29,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:01:29,994 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-18 18:01:31,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:31,042 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-18 18:01:31,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 18:01:31,042 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-18 18:01:31,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:31,043 INFO L225 Difference]: With dead ends: 93 [2020-08-18 18:01:31,043 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 18:01:31,044 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 18:01:31,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 18:01:31,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-18 18:01:31,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 18:01:31,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-18 18:01:31,052 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-18 18:01:31,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:31,052 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-18 18:01:31,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 18:01:31,052 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-18 18:01:31,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 18:01:31,053 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:31,053 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:31,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 18:01:31,054 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:31,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:31,055 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-18 18:01:31,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:31,055 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1729103048] [2020-08-18 18:01:31,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:31,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:31,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:31,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:31,646 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 18:01:31,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1729103048] [2020-08-18 18:01:31,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:31,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 18:01:31,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287708926] [2020-08-18 18:01:31,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 18:01:31,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:31,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 18:01:31,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-18 18:01:31,649 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-18 18:01:32,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:32,649 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-18 18:01:32,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 18:01:32,649 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-18 18:01:32,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:32,651 INFO L225 Difference]: With dead ends: 96 [2020-08-18 18:01:32,651 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 18:01:32,651 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 18:01:32,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 18:01:32,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-18 18:01:32,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 18:01:32,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-18 18:01:32,659 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-18 18:01:32,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:32,660 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-18 18:01:32,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 18:01:32,660 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-18 18:01:32,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 18:01:32,661 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:32,661 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:32,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 18:01:32,661 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:32,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:32,662 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-18 18:01:32,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:32,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105529121] [2020-08-18 18:01:32,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:32,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:33,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:33,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:33,328 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 18:01:33,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105529121] [2020-08-18 18:01:33,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:33,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 18:01:33,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581667277] [2020-08-18 18:01:33,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 18:01:33,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:33,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 18:01:33,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-18 18:01:33,331 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-18 18:01:34,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:34,346 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-18 18:01:34,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 18:01:34,347 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-18 18:01:34,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:34,348 INFO L225 Difference]: With dead ends: 99 [2020-08-18 18:01:34,348 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 18:01:34,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:01:34,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 18:01:34,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-18 18:01:34,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-18 18:01:34,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-18 18:01:34,356 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-18 18:01:34,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:34,356 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-18 18:01:34,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 18:01:34,356 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-18 18:01:34,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-18 18:01:34,357 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:34,357 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:34,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 18:01:34,357 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:34,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:34,358 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-18 18:01:34,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:34,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1747367637] [2020-08-18 18:01:34,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:34,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:35,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:35,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:35,063 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 18:01:35,063 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1747367637] [2020-08-18 18:01:35,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:35,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 18:01:35,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771252021] [2020-08-18 18:01:35,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 18:01:35,064 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:35,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 18:01:35,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-18 18:01:35,065 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-18 18:01:36,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:36,187 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-18 18:01:36,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 18:01:36,187 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-18 18:01:36,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:36,188 INFO L225 Difference]: With dead ends: 102 [2020-08-18 18:01:36,188 INFO L226 Difference]: Without dead ends: 97 [2020-08-18 18:01:36,189 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 18:01:36,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-18 18:01:36,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-18 18:01:36,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 18:01:36,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-18 18:01:36,196 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-18 18:01:36,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:36,197 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-18 18:01:36,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 18:01:36,197 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-18 18:01:36,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 18:01:36,198 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:36,198 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:36,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 18:01:36,198 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:36,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:36,199 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-18 18:01:36,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:36,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589084268] [2020-08-18 18:01:36,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:36,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:36,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:36,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:36,922 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 18:01:36,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589084268] [2020-08-18 18:01:36,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:36,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 18:01:36,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67229170] [2020-08-18 18:01:36,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 18:01:36,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:36,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 18:01:36,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 18:01:36,924 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-18 18:01:38,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:38,151 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-18 18:01:38,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 18:01:38,152 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-18 18:01:38,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:38,153 INFO L225 Difference]: With dead ends: 105 [2020-08-18 18:01:38,153 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 18:01:38,155 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 18:01:38,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 18:01:38,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-18 18:01:38,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-18 18:01:38,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-18 18:01:38,162 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-18 18:01:38,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:38,163 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-18 18:01:38,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 18:01:38,163 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-18 18:01:38,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-18 18:01:38,164 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:38,164 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:38,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 18:01:38,164 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:38,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:38,164 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-18 18:01:38,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:38,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [724058390] [2020-08-18 18:01:38,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:38,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:38,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:38,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:38,940 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 18:01:38,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [724058390] [2020-08-18 18:01:38,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:38,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 18:01:38,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866273023] [2020-08-18 18:01:38,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 18:01:38,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:38,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 18:01:38,942 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 18:01:38,943 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-18 18:01:40,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:40,235 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-18 18:01:40,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 18:01:40,236 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-18 18:01:40,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:40,238 INFO L225 Difference]: With dead ends: 108 [2020-08-18 18:01:40,238 INFO L226 Difference]: Without dead ends: 103 [2020-08-18 18:01:40,239 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 18:01:40,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-18 18:01:40,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-18 18:01:40,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 18:01:40,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-18 18:01:40,247 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-18 18:01:40,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:40,247 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-18 18:01:40,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 18:01:40,248 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-18 18:01:40,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 18:01:40,249 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:40,249 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:40,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 18:01:40,249 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:40,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:40,250 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-18 18:01:40,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:40,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237678871] [2020-08-18 18:01:40,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:40,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:41,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:41,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:41,086 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 18:01:41,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237678871] [2020-08-18 18:01:41,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:41,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 18:01:41,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771010177] [2020-08-18 18:01:41,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 18:01:41,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:41,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 18:01:41,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 18:01:41,089 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-18 18:01:42,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:42,459 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-18 18:01:42,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 18:01:42,467 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-18 18:01:42,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:42,468 INFO L225 Difference]: With dead ends: 111 [2020-08-18 18:01:42,469 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 18:01:42,469 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 18:01:42,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 18:01:42,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-18 18:01:42,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-18 18:01:42,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-18 18:01:42,480 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-18 18:01:42,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:42,480 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-18 18:01:42,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 18:01:42,480 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-18 18:01:42,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-18 18:01:42,481 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:42,481 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:42,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 18:01:42,482 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:42,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:42,482 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-18 18:01:42,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:42,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1540695500] [2020-08-18 18:01:42,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:42,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:43,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:43,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:43,412 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 18:01:43,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1540695500] [2020-08-18 18:01:43,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:43,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 18:01:43,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902645529] [2020-08-18 18:01:43,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 18:01:43,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:43,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 18:01:43,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 18:01:43,414 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-18 18:01:44,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:44,870 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-18 18:01:44,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 18:01:44,870 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-18 18:01:44,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:44,872 INFO L225 Difference]: With dead ends: 114 [2020-08-18 18:01:44,872 INFO L226 Difference]: Without dead ends: 109 [2020-08-18 18:01:44,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 18:01:44,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-18 18:01:44,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-18 18:01:44,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 18:01:44,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-18 18:01:44,882 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-18 18:01:44,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:44,882 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-18 18:01:44,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 18:01:44,883 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-18 18:01:44,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-18 18:01:44,884 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:44,884 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:44,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 18:01:44,884 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:44,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:44,885 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-18 18:01:44,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:44,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2063911095] [2020-08-18 18:01:44,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:44,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:45,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:45,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:45,784 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 18:01:45,784 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2063911095] [2020-08-18 18:01:45,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:45,784 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 18:01:45,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896333812] [2020-08-18 18:01:45,785 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 18:01:45,785 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:45,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 18:01:45,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 18:01:45,786 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-18 18:01:47,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:47,331 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-18 18:01:47,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 18:01:47,332 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-18 18:01:47,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:47,333 INFO L225 Difference]: With dead ends: 117 [2020-08-18 18:01:47,333 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 18:01:47,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 18:01:47,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 18:01:47,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-18 18:01:47,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-18 18:01:47,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-18 18:01:47,343 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-18 18:01:47,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:47,343 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-18 18:01:47,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 18:01:47,344 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-18 18:01:47,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-18 18:01:47,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:47,345 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:47,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 18:01:47,345 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:47,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:47,345 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-18 18:01:47,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:47,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [905736793] [2020-08-18 18:01:47,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:47,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:48,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:48,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:48,338 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 18:01:48,338 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [905736793] [2020-08-18 18:01:48,338 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:48,338 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 18:01:48,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20363336] [2020-08-18 18:01:48,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 18:01:48,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:48,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 18:01:48,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 18:01:48,340 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-18 18:01:50,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:50,009 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-18 18:01:50,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 18:01:50,011 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-18 18:01:50,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:50,012 INFO L225 Difference]: With dead ends: 120 [2020-08-18 18:01:50,013 INFO L226 Difference]: Without dead ends: 115 [2020-08-18 18:01:50,013 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 18:01:50,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-18 18:01:50,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-18 18:01:50,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-18 18:01:50,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-18 18:01:50,023 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-18 18:01:50,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:50,023 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-18 18:01:50,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 18:01:50,023 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-18 18:01:50,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-18 18:01:50,024 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:50,024 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:50,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 18:01:50,025 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:50,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:50,025 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-18 18:01:50,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:50,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2141733148] [2020-08-18 18:01:50,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:50,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:51,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:51,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:51,066 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 18:01:51,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2141733148] [2020-08-18 18:01:51,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:51,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 18:01:51,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249065133] [2020-08-18 18:01:51,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 18:01:51,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:51,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 18:01:51,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 18:01:51,068 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-18 18:01:52,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:52,813 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-18 18:01:52,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 18:01:52,814 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-18 18:01:52,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:52,815 INFO L225 Difference]: With dead ends: 123 [2020-08-18 18:01:52,815 INFO L226 Difference]: Without dead ends: 118 [2020-08-18 18:01:52,816 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 18:01:52,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-18 18:01:52,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-18 18:01:52,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-18 18:01:52,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-18 18:01:52,825 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-18 18:01:52,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:52,826 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-18 18:01:52,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 18:01:52,826 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-18 18:01:52,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-18 18:01:52,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:52,827 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:52,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 18:01:52,828 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:52,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:52,828 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-18 18:01:52,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:52,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684519330] [2020-08-18 18:01:52,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:52,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:53,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:53,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:53,923 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 18:01:53,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684519330] [2020-08-18 18:01:53,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:53,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 18:01:53,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249577640] [2020-08-18 18:01:53,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 18:01:53,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:53,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 18:01:53,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 18:01:53,926 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-18 18:01:55,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:55,776 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-18 18:01:55,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 18:01:55,777 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-18 18:01:55,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:55,779 INFO L225 Difference]: With dead ends: 126 [2020-08-18 18:01:55,779 INFO L226 Difference]: Without dead ends: 121 [2020-08-18 18:01:55,780 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 18:01:55,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-18 18:01:55,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-18 18:01:55,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-18 18:01:55,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-18 18:01:55,791 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-18 18:01:55,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:55,791 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-18 18:01:55,791 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 18:01:55,791 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-18 18:01:55,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-18 18:01:55,792 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:55,792 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:55,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 18:01:55,793 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:55,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:55,793 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-18 18:01:55,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:55,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126034128] [2020-08-18 18:01:55,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:55,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:56,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:01:56,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:01:56,945 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 18:01:56,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126034128] [2020-08-18 18:01:56,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:01:56,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 18:01:56,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469484909] [2020-08-18 18:01:56,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 18:01:56,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:01:56,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 18:01:56,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 18:01:56,959 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-18 18:01:58,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:01:58,896 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-18 18:01:58,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 18:01:58,896 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-18 18:01:58,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:01:58,898 INFO L225 Difference]: With dead ends: 129 [2020-08-18 18:01:58,898 INFO L226 Difference]: Without dead ends: 124 [2020-08-18 18:01:58,900 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 18:01:58,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-18 18:01:58,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-18 18:01:58,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-18 18:01:58,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-18 18:01:58,910 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-18 18:01:58,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:01:58,911 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-18 18:01:58,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 18:01:58,911 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-18 18:01:58,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-18 18:01:58,912 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:01:58,912 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:01:58,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 18:01:58,912 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:01:58,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:01:58,912 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-18 18:01:58,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:01:58,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2145243758] [2020-08-18 18:01:58,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:01:58,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:02:00,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:02:00,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:02:00,130 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 18:02:00,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2145243758] [2020-08-18 18:02:00,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:02:00,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 18:02:00,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352577971] [2020-08-18 18:02:00,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 18:02:00,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:02:00,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 18:02:00,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 18:02:00,132 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-18 18:02:02,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:02:02,211 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-18 18:02:02,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 18:02:02,211 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-18 18:02:02,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:02:02,213 INFO L225 Difference]: With dead ends: 132 [2020-08-18 18:02:02,213 INFO L226 Difference]: Without dead ends: 127 [2020-08-18 18:02:02,214 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 18:02:02,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-18 18:02:02,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-18 18:02:02,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-18 18:02:02,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-18 18:02:02,225 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-18 18:02:02,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:02:02,226 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-18 18:02:02,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 18:02:02,226 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-18 18:02:02,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-18 18:02:02,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:02:02,227 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:02:02,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 18:02:02,227 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:02:02,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:02:02,228 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-18 18:02:02,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:02:02,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721016162] [2020-08-18 18:02:02,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:02:02,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:02:03,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:02:03,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:02:03,518 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 18:02:03,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721016162] [2020-08-18 18:02:03,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:02:03,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 18:02:03,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939464812] [2020-08-18 18:02:03,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 18:02:03,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:02:03,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 18:02:03,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 18:02:03,520 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-18 18:02:05,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:02:05,731 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-18 18:02:05,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 18:02:05,731 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-18 18:02:05,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:02:05,733 INFO L225 Difference]: With dead ends: 135 [2020-08-18 18:02:05,733 INFO L226 Difference]: Without dead ends: 130 [2020-08-18 18:02:05,734 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 18:02:05,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-18 18:02:05,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-18 18:02:05,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-18 18:02:05,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-18 18:02:05,746 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-18 18:02:05,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:02:05,747 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-18 18:02:05,747 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 18:02:05,747 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-18 18:02:05,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-18 18:02:05,748 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:02:05,748 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:02:05,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 18:02:05,748 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:02:05,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:02:05,748 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-18 18:02:05,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:02:05,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [750382885] [2020-08-18 18:02:05,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:02:05,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:02:07,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:02:07,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:02:07,097 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 18:02:07,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [750382885] [2020-08-18 18:02:07,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:02:07,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 18:02:07,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964173015] [2020-08-18 18:02:07,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 18:02:07,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:02:07,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 18:02:07,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 18:02:07,099 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-18 18:02:09,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:02:09,398 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-18 18:02:09,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 18:02:09,399 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-18 18:02:09,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:02:09,400 INFO L225 Difference]: With dead ends: 138 [2020-08-18 18:02:09,401 INFO L226 Difference]: Without dead ends: 133 [2020-08-18 18:02:09,402 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 18:02:09,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-18 18:02:09,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-18 18:02:09,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-18 18:02:09,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-18 18:02:09,415 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-18 18:02:09,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:02:09,416 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-18 18:02:09,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 18:02:09,416 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-18 18:02:09,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-18 18:02:09,417 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:02:09,417 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:02:09,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 18:02:09,417 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:02:09,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:02:09,417 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-18 18:02:09,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:02:09,418 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729153056] [2020-08-18 18:02:09,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:02:09,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:02:10,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:02:10,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:02:10,884 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 18:02:10,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729153056] [2020-08-18 18:02:10,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:02:10,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 18:02:10,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608069589] [2020-08-18 18:02:10,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 18:02:10,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:02:10,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 18:02:10,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 18:02:10,886 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states. [2020-08-18 18:02:13,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:02:13,297 INFO L93 Difference]: Finished difference Result 141 states and 183 transitions. [2020-08-18 18:02:13,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 18:02:13,297 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 132 [2020-08-18 18:02:13,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:02:13,299 INFO L225 Difference]: With dead ends: 141 [2020-08-18 18:02:13,299 INFO L226 Difference]: Without dead ends: 136 [2020-08-18 18:02:13,300 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 18:02:13,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-08-18 18:02:13,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2020-08-18 18:02:13,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-08-18 18:02:13,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 178 transitions. [2020-08-18 18:02:13,312 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 178 transitions. Word has length 132 [2020-08-18 18:02:13,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:02:13,312 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 178 transitions. [2020-08-18 18:02:13,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 18:02:13,313 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 178 transitions. [2020-08-18 18:02:13,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-08-18 18:02:13,313 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:02:13,313 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:02:13,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 18:02:13,314 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:02:13,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:02:13,314 INFO L82 PathProgramCache]: Analyzing trace with hash 224269993, now seen corresponding path program 41 times [2020-08-18 18:02:13,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:02:13,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [604908518] [2020-08-18 18:02:13,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:02:13,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat