/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 21:30:12,765 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 21:30:12,768 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 21:30:12,792 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 21:30:12,792 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 21:30:12,793 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 21:30:12,794 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 21:30:12,796 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 21:30:12,798 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 21:30:12,799 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 21:30:12,800 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 21:30:12,801 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 21:30:12,801 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 21:30:12,802 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 21:30:12,803 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 21:30:12,804 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 21:30:12,805 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 21:30:12,807 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 21:30:12,808 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 21:30:12,810 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 21:30:12,811 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 21:30:12,812 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 21:30:12,814 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 21:30:12,814 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 21:30:12,817 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 21:30:12,825 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 21:30:12,826 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 21:30:12,826 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 21:30:12,827 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 [2020-08-21 21:30:12,850 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 21:30:12,850 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 21:30:12,851 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 21:30:12,851 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 21:30:12,852 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 21:30:12,852 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 21:30:12,852 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 21:30:12,852 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 21:30:12,852 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 21:30:12,853 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 21:30:12,853 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 21:30:12,853 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 21:30:12,853 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 21:30:12,853 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 21:30:12,854 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 21:30:12,854 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 21:30:12,854 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 21:30:12,854 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 21:30:12,854 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 21:30:12,854 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 21:30:12,855 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 21:30:12,855 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:30:12,855 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 21:30:12,855 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 21:30:12,855 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 21:30:12,856 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 21:30:12,856 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 21:30:12,856 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 21:30:12,856 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 21:30:12,856 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=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; [2020-08-21 21:30:13,218 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 21:30:13,231 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 21:30:13,235 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 21:30:13,236 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 21:30:13,237 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 21:30:13,238 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-21 21:30:13,315 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b9053125b/e704ff2563df434d8058744e2614d43b/FLAG9449af19c [2020-08-21 21:30:13,757 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 21:30:13,758 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-21 21:30:13,764 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b9053125b/e704ff2563df434d8058744e2614d43b/FLAG9449af19c [2020-08-21 21:30:14,134 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b9053125b/e704ff2563df434d8058744e2614d43b [2020-08-21 21:30:14,144 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 21:30:14,146 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 21:30:14,147 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 21:30:14,147 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 21:30:14,151 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 21:30:14,152 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:30:14" (1/1) ... [2020-08-21 21:30:14,155 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f58caab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:14, skipping insertion in model container [2020-08-21 21:30:14,155 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:30:14" (1/1) ... [2020-08-21 21:30:14,163 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 21:30:14,180 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 21:30:14,350 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:30:14,354 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 21:30:14,370 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:30:14,385 INFO L208 MainTranslator]: Completed translation [2020-08-21 21:30:14,385 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:14 WrapperNode [2020-08-21 21:30:14,385 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 21:30:14,386 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 21:30:14,386 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 21:30:14,387 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 21:30:14,398 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:14" (1/1) ... [2020-08-21 21:30:14,398 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:14" (1/1) ... [2020-08-21 21:30:14,403 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:14" (1/1) ... [2020-08-21 21:30:14,404 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:14" (1/1) ... [2020-08-21 21:30:14,407 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:14" (1/1) ... [2020-08-21 21:30:14,413 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:14" (1/1) ... [2020-08-21 21:30:14,414 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:14" (1/1) ... [2020-08-21 21:30:14,415 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 21:30:14,417 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 21:30:14,417 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 21:30:14,417 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 21:30:14,418 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:14" (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 [2020-08-21 21:30:14,559 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 21:30:14,559 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 21:30:14,559 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 21:30:14,559 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 21:30:14,560 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 21:30:14,560 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 21:30:14,560 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 21:30:14,560 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 21:30:14,560 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 21:30:14,560 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 21:30:14,560 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 21:30:14,561 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 21:30:14,561 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 21:30:14,768 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 21:30:14,769 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 21:30:14,774 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:30:14 BoogieIcfgContainer [2020-08-21 21:30:14,774 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 21:30:14,775 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 21:30:14,776 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 21:30:14,780 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 21:30:14,780 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:30:14" (1/3) ... [2020-08-21 21:30:14,781 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@572a2843 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:30:14, skipping insertion in model container [2020-08-21 21:30:14,782 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:14" (2/3) ... [2020-08-21 21:30:14,782 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@572a2843 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:30:14, skipping insertion in model container [2020-08-21 21:30:14,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:30:14" (3/3) ... [2020-08-21 21:30:14,787 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-21 21:30:14,795 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 21:30:14,802 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 21:30:14,816 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 21:30:14,840 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 21:30:14,841 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 21:30:14,841 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 21:30:14,841 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 21:30:14,841 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 21:30:14,841 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 21:30:14,841 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 21:30:14,842 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 21:30:14,860 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 21:30:14,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 21:30:14,866 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:14,867 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:14,867 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:14,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:14,872 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-21 21:30:14,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:14,880 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1977683459] [2020-08-21 21:30:14,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:14,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:14,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:14,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:14,997 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:14,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1977683459] [2020-08-21 21:30:15,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:30:15,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 21:30:15,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262863139] [2020-08-21 21:30:15,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 21:30:15,006 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:15,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 21:30:15,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 21:30:15,018 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-21 21:30:15,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:15,038 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-21 21:30:15,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 21:30:15,039 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 21:30:15,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:15,046 INFO L225 Difference]: With dead ends: 32 [2020-08-21 21:30:15,046 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 21:30:15,050 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 [2020-08-21 21:30:15,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 21:30:15,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 21:30:15,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 21:30:15,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-21 21:30:15,086 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-21 21:30:15,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:15,086 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-21 21:30:15,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 21:30:15,087 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-21 21:30:15,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 21:30:15,087 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:15,088 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:15,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 21:30:15,088 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:15,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:15,089 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-21 21:30:15,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:15,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [372220812] [2020-08-21 21:30:15,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:15,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:15,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,209 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:15,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [372220812] [2020-08-21 21:30:15,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:30:15,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 21:30:15,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86837431] [2020-08-21 21:30:15,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:30:15,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:15,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:30:15,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:30:15,223 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-21 21:30:15,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:15,339 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-21 21:30:15,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:30:15,339 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 21:30:15,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:15,341 INFO L225 Difference]: With dead ends: 21 [2020-08-21 21:30:15,341 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 21:30:15,342 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 [2020-08-21 21:30:15,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 21:30:15,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 21:30:15,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 21:30:15,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 21:30:15,348 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-21 21:30:15,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:15,349 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 21:30:15,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:30:15,349 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 21:30:15,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 21:30:15,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:15,350 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:15,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 21:30:15,351 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:15,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:15,352 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-21 21:30:15,352 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:15,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1625566013] [2020-08-21 21:30:15,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:15,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:15,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,442 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:15,443 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1625566013] [2020-08-21 21:30:15,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:15,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 21:30:15,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433317849] [2020-08-21 21:30:15,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:30:15,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:15,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:30:15,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:30:15,446 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-21 21:30:15,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:15,504 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 21:30:15,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:30:15,505 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-21 21:30:15,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:15,506 INFO L225 Difference]: With dead ends: 24 [2020-08-21 21:30:15,506 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 21:30:15,507 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 [2020-08-21 21:30:15,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 21:30:15,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 21:30:15,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 21:30:15,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-21 21:30:15,513 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-21 21:30:15,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:15,513 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-21 21:30:15,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:30:15,514 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-21 21:30:15,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 21:30:15,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:15,515 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:15,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 21:30:15,516 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:15,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:15,516 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-21 21:30:15,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:15,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1793774799] [2020-08-21 21:30:15,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:15,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:15,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,620 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:15,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1793774799] [2020-08-21 21:30:15,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:15,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 21:30:15,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840499552] [2020-08-21 21:30:15,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 21:30:15,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:15,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 21:30:15,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:30:15,623 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-21 21:30:15,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:15,701 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-21 21:30:15,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 21:30:15,702 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-21 21:30:15,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:15,703 INFO L225 Difference]: With dead ends: 27 [2020-08-21 21:30:15,703 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 21:30:15,704 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 [2020-08-21 21:30:15,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 21:30:15,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 21:30:15,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 21:30:15,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-21 21:30:15,710 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-21 21:30:15,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:15,710 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-21 21:30:15,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 21:30:15,711 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-21 21:30:15,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 21:30:15,711 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:15,712 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:15,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 21:30:15,712 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:15,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:15,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-21 21:30:15,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:15,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2199520] [2020-08-21 21:30:15,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:15,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:15,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,853 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:15,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2199520] [2020-08-21 21:30:15,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:15,855 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 21:30:15,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004483270] [2020-08-21 21:30:15,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 21:30:15,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:15,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 21:30:15,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:30:15,857 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-21 21:30:15,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:15,949 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-21 21:30:15,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 21:30:15,950 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-21 21:30:15,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:15,951 INFO L225 Difference]: With dead ends: 30 [2020-08-21 21:30:15,951 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 21:30:15,952 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 [2020-08-21 21:30:15,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 21:30:15,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 21:30:15,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 21:30:15,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-21 21:30:15,958 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-21 21:30:15,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:15,959 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-21 21:30:15,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 21:30:15,959 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-21 21:30:15,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 21:30:15,960 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:15,960 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:15,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 21:30:15,961 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:15,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:15,961 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-21 21:30:15,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:15,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1183922225] [2020-08-21 21:30:15,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:15,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:16,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:16,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:16,078 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:16,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1183922225] [2020-08-21 21:30:16,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:16,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 21:30:16,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789687747] [2020-08-21 21:30:16,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 21:30:16,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:16,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 21:30:16,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:30:16,081 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-21 21:30:16,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:16,173 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-21 21:30:16,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 21:30:16,174 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-21 21:30:16,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:16,175 INFO L225 Difference]: With dead ends: 33 [2020-08-21 21:30:16,175 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 21:30:16,175 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 [2020-08-21 21:30:16,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 21:30:16,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 21:30:16,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 21:30:16,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-21 21:30:16,192 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-21 21:30:16,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:16,193 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-21 21:30:16,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 21:30:16,193 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-21 21:30:16,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 21:30:16,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:16,194 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:16,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 21:30:16,195 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:16,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:16,195 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-21 21:30:16,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:16,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [827739429] [2020-08-21 21:30:16,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:16,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:16,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:16,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:16,367 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:16,368 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [827739429] [2020-08-21 21:30:16,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:16,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 21:30:16,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643358138] [2020-08-21 21:30:16,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 21:30:16,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:16,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 21:30:16,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:30:16,370 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-21 21:30:16,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:16,471 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-21 21:30:16,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 21:30:16,472 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-21 21:30:16,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:16,473 INFO L225 Difference]: With dead ends: 36 [2020-08-21 21:30:16,473 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 21:30:16,474 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 [2020-08-21 21:30:16,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 21:30:16,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 21:30:16,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 21:30:16,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-21 21:30:16,480 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-21 21:30:16,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:16,481 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-21 21:30:16,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 21:30:16,481 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-21 21:30:16,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 21:30:16,482 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:16,482 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:16,483 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 21:30:16,483 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:16,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:16,483 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-21 21:30:16,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:16,484 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932779068] [2020-08-21 21:30:16,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:16,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:16,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:16,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:16,616 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:16,617 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932779068] [2020-08-21 21:30:16,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:16,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 21:30:16,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346292756] [2020-08-21 21:30:16,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 21:30:16,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:16,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 21:30:16,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:30:16,619 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-21 21:30:16,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:16,749 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-21 21:30:16,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 21:30:16,750 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 21:30:16,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:16,751 INFO L225 Difference]: With dead ends: 39 [2020-08-21 21:30:16,751 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 21:30:16,752 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 [2020-08-21 21:30:16,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 21:30:16,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 21:30:16,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 21:30:16,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-21 21:30:16,759 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-21 21:30:16,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:16,760 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-21 21:30:16,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 21:30:16,760 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-21 21:30:16,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 21:30:16,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:16,761 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:16,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 21:30:16,762 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:16,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:16,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-21 21:30:16,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:16,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160738801] [2020-08-21 21:30:16,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:16,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:16,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:16,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:16,950 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:16,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160738801] [2020-08-21 21:30:16,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:16,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 21:30:16,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321741708] [2020-08-21 21:30:16,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 21:30:16,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:16,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 21:30:16,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:30:16,953 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-21 21:30:17,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:17,092 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-21 21:30:17,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 21:30:17,092 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-21 21:30:17,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:17,093 INFO L225 Difference]: With dead ends: 42 [2020-08-21 21:30:17,094 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 21:30:17,094 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 [2020-08-21 21:30:17,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 21:30:17,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 21:30:17,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 21:30:17,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-21 21:30:17,101 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-21 21:30:17,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:17,101 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-21 21:30:17,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 21:30:17,101 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-21 21:30:17,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 21:30:17,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:17,103 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:17,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 21:30:17,103 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:17,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:17,104 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-21 21:30:17,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:17,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1375026721] [2020-08-21 21:30:17,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:17,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:17,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:17,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:17,260 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:17,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1375026721] [2020-08-21 21:30:17,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:17,261 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 21:30:17,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567516893] [2020-08-21 21:30:17,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 21:30:17,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:17,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 21:30:17,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:30:17,263 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-21 21:30:17,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:17,414 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-21 21:30:17,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 21:30:17,414 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 21:30:17,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:17,415 INFO L225 Difference]: With dead ends: 45 [2020-08-21 21:30:17,415 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 21:30:17,416 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 [2020-08-21 21:30:17,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 21:30:17,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 21:30:17,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 21:30:17,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-21 21:30:17,422 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-21 21:30:17,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:17,423 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-21 21:30:17,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 21:30:17,423 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-21 21:30:17,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 21:30:17,424 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:17,424 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:17,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 21:30:17,425 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:17,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:17,425 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-21 21:30:17,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:17,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166022878] [2020-08-21 21:30:17,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:17,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:17,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:17,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:17,646 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:17,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166022878] [2020-08-21 21:30:17,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:17,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 21:30:17,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54086745] [2020-08-21 21:30:17,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 21:30:17,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:17,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 21:30:17,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:30:17,651 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-21 21:30:17,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:17,863 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-21 21:30:17,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 21:30:17,863 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-21 21:30:17,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:17,864 INFO L225 Difference]: With dead ends: 48 [2020-08-21 21:30:17,865 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 21:30:17,866 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 [2020-08-21 21:30:17,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 21:30:17,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 21:30:17,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 21:30:17,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-21 21:30:17,877 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-21 21:30:17,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:17,878 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-21 21:30:17,878 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 21:30:17,878 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-21 21:30:17,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 21:30:17,881 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:17,881 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:17,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 21:30:17,884 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:17,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:17,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-21 21:30:17,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:17,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1010970145] [2020-08-21 21:30:17,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:17,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:18,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:18,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:18,105 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:18,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1010970145] [2020-08-21 21:30:18,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:18,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 21:30:18,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979131914] [2020-08-21 21:30:18,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 21:30:18,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:18,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 21:30:18,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:30:18,108 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-21 21:30:18,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:18,343 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-21 21:30:18,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 21:30:18,344 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-21 21:30:18,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:18,345 INFO L225 Difference]: With dead ends: 51 [2020-08-21 21:30:18,345 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 21:30:18,349 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 [2020-08-21 21:30:18,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 21:30:18,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 21:30:18,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 21:30:18,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-21 21:30:18,359 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-21 21:30:18,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:18,360 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-21 21:30:18,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 21:30:18,363 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-21 21:30:18,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 21:30:18,364 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:18,364 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:18,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 21:30:18,364 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:18,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:18,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-21 21:30:18,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:18,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [143834160] [2020-08-21 21:30:18,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:18,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:18,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:18,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:18,577 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:18,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [143834160] [2020-08-21 21:30:18,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:18,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 21:30:18,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662370593] [2020-08-21 21:30:18,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 21:30:18,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:18,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 21:30:18,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:30:18,581 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-21 21:30:18,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:18,881 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-21 21:30:18,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 21:30:18,882 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-21 21:30:18,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:18,883 INFO L225 Difference]: With dead ends: 54 [2020-08-21 21:30:18,883 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 21:30:18,884 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 [2020-08-21 21:30:18,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 21:30:18,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 21:30:18,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 21:30:18,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-21 21:30:18,890 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-21 21:30:18,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:18,891 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-21 21:30:18,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 21:30:18,891 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-21 21:30:18,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 21:30:18,892 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:18,892 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:18,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 21:30:18,892 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:18,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:18,893 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-21 21:30:18,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:18,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198994651] [2020-08-21 21:30:18,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:18,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:19,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,109 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:19,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198994651] [2020-08-21 21:30:19,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:19,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 21:30:19,111 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879709764] [2020-08-21 21:30:19,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 21:30:19,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:19,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 21:30:19,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:30:19,113 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-21 21:30:19,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:19,414 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-21 21:30:19,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 21:30:19,414 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 21:30:19,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:19,415 INFO L225 Difference]: With dead ends: 57 [2020-08-21 21:30:19,415 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 21:30:19,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:30:19,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 21:30:19,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 21:30:19,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 21:30:19,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-21 21:30:19,426 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-21 21:30:19,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:19,426 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-21 21:30:19,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 21:30:19,426 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-21 21:30:19,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 21:30:19,429 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:19,430 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:19,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 21:30:19,430 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:19,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:19,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-21 21:30:19,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:19,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [64667894] [2020-08-21 21:30:19,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:19,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:19,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,727 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:19,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [64667894] [2020-08-21 21:30:19,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:19,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 21:30:19,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015890685] [2020-08-21 21:30:19,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 21:30:19,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:19,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 21:30:19,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:30:19,730 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-21 21:30:20,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:20,066 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-21 21:30:20,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 21:30:20,067 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-21 21:30:20,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:20,068 INFO L225 Difference]: With dead ends: 60 [2020-08-21 21:30:20,068 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 21:30:20,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:30:20,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 21:30:20,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 21:30:20,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 21:30:20,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-21 21:30:20,081 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-21 21:30:20,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:20,082 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-21 21:30:20,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 21:30:20,082 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-21 21:30:20,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 21:30:20,087 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:20,088 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:20,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 21:30:20,088 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:20,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:20,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-21 21:30:20,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:20,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1718982389] [2020-08-21 21:30:20,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:20,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:20,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,376 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:20,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1718982389] [2020-08-21 21:30:20,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:20,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 21:30:20,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034479489] [2020-08-21 21:30:20,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 21:30:20,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:20,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 21:30:20,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:30:20,381 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-21 21:30:20,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:20,718 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-21 21:30:20,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 21:30:20,719 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-21 21:30:20,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:20,720 INFO L225 Difference]: With dead ends: 63 [2020-08-21 21:30:20,720 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 21:30:20,722 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 [2020-08-21 21:30:20,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 21:30:20,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 21:30:20,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 21:30:20,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-21 21:30:20,729 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-21 21:30:20,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:20,729 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-21 21:30:20,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 21:30:20,729 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-21 21:30:20,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 21:30:20,730 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:20,730 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:20,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 21:30:20,731 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:20,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:20,731 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-21 21:30:20,731 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:20,732 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1136983025] [2020-08-21 21:30:20,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:20,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:21,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,030 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:21,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1136983025] [2020-08-21 21:30:21,031 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:21,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 21:30:21,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554719225] [2020-08-21 21:30:21,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 21:30:21,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:21,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 21:30:21,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:30:21,033 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-21 21:30:21,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:21,470 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-21 21:30:21,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 21:30:21,470 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-21 21:30:21,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:21,471 INFO L225 Difference]: With dead ends: 66 [2020-08-21 21:30:21,472 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 21:30:21,472 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 [2020-08-21 21:30:21,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 21:30:21,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-21 21:30:21,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 21:30:21,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-21 21:30:21,480 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-21 21:30:21,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:21,480 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-21 21:30:21,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 21:30:21,481 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-21 21:30:21,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 21:30:21,481 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:21,482 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:21,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 21:30:21,482 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:21,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:21,482 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-21 21:30:21,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:21,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585808598] [2020-08-21 21:30:21,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:21,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:21,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,817 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:21,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585808598] [2020-08-21 21:30:21,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:21,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 21:30:21,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988717368] [2020-08-21 21:30:21,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 21:30:21,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:21,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 21:30:21,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:30:21,819 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-21 21:30:22,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:22,303 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-21 21:30:22,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 21:30:22,304 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-21 21:30:22,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:22,304 INFO L225 Difference]: With dead ends: 69 [2020-08-21 21:30:22,305 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 21:30:22,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:30:22,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 21:30:22,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-21 21:30:22,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 21:30:22,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-21 21:30:22,320 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-21 21:30:22,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:22,321 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-21 21:30:22,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 21:30:22,321 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-21 21:30:22,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 21:30:22,325 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:22,325 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:22,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 21:30:22,325 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:22,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:22,326 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-21 21:30:22,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:22,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965036578] [2020-08-21 21:30:22,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:22,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:22,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,692 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:22,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965036578] [2020-08-21 21:30:22,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:22,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 21:30:22,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20222933] [2020-08-21 21:30:22,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 21:30:22,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:22,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 21:30:22,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:30:22,695 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-21 21:30:23,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:23,204 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-21 21:30:23,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 21:30:23,205 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-21 21:30:23,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:23,206 INFO L225 Difference]: With dead ends: 72 [2020-08-21 21:30:23,206 INFO L226 Difference]: Without dead ends: 67 [2020-08-21 21:30:23,207 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 [2020-08-21 21:30:23,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-21 21:30:23,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-21 21:30:23,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 21:30:23,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-21 21:30:23,218 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-21 21:30:23,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:23,220 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-21 21:30:23,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 21:30:23,221 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-21 21:30:23,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 21:30:23,225 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:23,225 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:23,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 21:30:23,225 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:23,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:23,226 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-21 21:30:23,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:23,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1239395999] [2020-08-21 21:30:23,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:23,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:23,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:23,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:23,613 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:23,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1239395999] [2020-08-21 21:30:23,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:23,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 21:30:23,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186868665] [2020-08-21 21:30:23,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 21:30:23,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:23,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 21:30:23,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:30:23,616 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-21 21:30:24,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:24,198 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-21 21:30:24,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 21:30:24,199 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-21 21:30:24,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:24,200 INFO L225 Difference]: With dead ends: 75 [2020-08-21 21:30:24,200 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 21:30:24,201 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 [2020-08-21 21:30:24,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 21:30:24,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-21 21:30:24,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-21 21:30:24,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-21 21:30:24,209 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-21 21:30:24,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:24,209 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-21 21:30:24,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 21:30:24,209 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-21 21:30:24,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 21:30:24,210 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:24,210 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:24,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 21:30:24,211 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:24,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:24,211 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-21 21:30:24,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:24,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1302420799] [2020-08-21 21:30:24,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:24,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:24,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:24,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:24,591 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:24,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1302420799] [2020-08-21 21:30:24,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:24,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 21:30:24,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688996959] [2020-08-21 21:30:24,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 21:30:24,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:24,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 21:30:24,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:30:24,594 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-21 21:30:25,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:25,211 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-21 21:30:25,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 21:30:25,211 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-21 21:30:25,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:25,212 INFO L225 Difference]: With dead ends: 78 [2020-08-21 21:30:25,213 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 21:30:25,213 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 [2020-08-21 21:30:25,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 21:30:25,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-21 21:30:25,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 21:30:25,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-21 21:30:25,219 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-21 21:30:25,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:25,219 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-21 21:30:25,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 21:30:25,219 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-21 21:30:25,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 21:30:25,220 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:25,220 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:25,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 21:30:25,220 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:25,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:25,221 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-21 21:30:25,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:25,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [186994319] [2020-08-21 21:30:25,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:25,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:25,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:25,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:25,641 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:25,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [186994319] [2020-08-21 21:30:25,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:25,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 21:30:25,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155613570] [2020-08-21 21:30:25,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 21:30:25,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:25,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 21:30:25,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:30:25,644 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-21 21:30:26,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:26,354 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-21 21:30:26,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 21:30:26,359 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-21 21:30:26,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:26,360 INFO L225 Difference]: With dead ends: 81 [2020-08-21 21:30:26,361 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 21:30:26,362 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 [2020-08-21 21:30:26,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 21:30:26,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-21 21:30:26,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-21 21:30:26,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-21 21:30:26,377 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-21 21:30:26,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:26,377 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-21 21:30:26,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 21:30:26,380 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-21 21:30:26,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 21:30:26,381 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:26,381 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:26,381 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 21:30:26,381 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:26,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:26,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-21 21:30:26,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:26,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314274714] [2020-08-21 21:30:26,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:26,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:26,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:26,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:26,824 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:26,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314274714] [2020-08-21 21:30:26,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:26,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 21:30:26,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806360890] [2020-08-21 21:30:26,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 21:30:26,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:26,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 21:30:26,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:30:26,838 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-21 21:30:27,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:27,554 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-21 21:30:27,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 21:30:27,555 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-21 21:30:27,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:27,556 INFO L225 Difference]: With dead ends: 84 [2020-08-21 21:30:27,557 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 21:30:27,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:30:27,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 21:30:27,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-21 21:30:27,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 21:30:27,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-21 21:30:27,565 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-21 21:30:27,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:27,566 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-21 21:30:27,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 21:30:27,566 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-21 21:30:27,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 21:30:27,567 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:27,567 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:27,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 21:30:27,567 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:27,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:27,568 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-21 21:30:27,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:27,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [37691770] [2020-08-21 21:30:27,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:27,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:28,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:28,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:28,058 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:28,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [37691770] [2020-08-21 21:30:28,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:28,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 21:30:28,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695783503] [2020-08-21 21:30:28,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 21:30:28,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:28,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 21:30:28,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:30:28,060 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-21 21:30:28,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:28,850 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-21 21:30:28,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 21:30:28,851 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-21 21:30:28,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:28,852 INFO L225 Difference]: With dead ends: 87 [2020-08-21 21:30:28,852 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 21:30:28,853 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 [2020-08-21 21:30:28,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 21:30:28,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-21 21:30:28,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 21:30:28,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-21 21:30:28,860 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-21 21:30:28,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:28,861 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-21 21:30:28,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 21:30:28,861 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-21 21:30:28,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 21:30:28,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:28,862 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:28,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 21:30:28,862 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:28,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:28,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-21 21:30:28,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:28,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941641030] [2020-08-21 21:30:28,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:28,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:29,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:29,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:29,410 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:29,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941641030] [2020-08-21 21:30:29,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:29,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 21:30:29,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714403435] [2020-08-21 21:30:29,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 21:30:29,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:29,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 21:30:29,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:30:29,412 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-21 21:30:30,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:30,260 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-21 21:30:30,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 21:30:30,260 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-21 21:30:30,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:30,262 INFO L225 Difference]: With dead ends: 90 [2020-08-21 21:30:30,262 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 21:30:30,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:30:30,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 21:30:30,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-21 21:30:30,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 21:30:30,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-21 21:30:30,269 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-21 21:30:30,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:30,270 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-21 21:30:30,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 21:30:30,270 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-21 21:30:30,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 21:30:30,271 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:30,271 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:30,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 21:30:30,271 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:30,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:30,272 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-21 21:30:30,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:30,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1084562913] [2020-08-21 21:30:30,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:30,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:30,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:30,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:30,979 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:30,980 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1084562913] [2020-08-21 21:30:30,980 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:30,980 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 21:30:30,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537864921] [2020-08-21 21:30:30,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 21:30:30,982 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:30,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 21:30:30,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:30:30,983 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-21 21:30:32,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:32,027 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-21 21:30:32,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 21:30:32,028 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-21 21:30:32,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:32,029 INFO L225 Difference]: With dead ends: 93 [2020-08-21 21:30:32,029 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 21:30:32,030 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 [2020-08-21 21:30:32,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 21:30:32,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-21 21:30:32,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 21:30:32,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-21 21:30:32,038 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-21 21:30:32,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:32,038 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-21 21:30:32,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 21:30:32,038 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-21 21:30:32,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 21:30:32,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:32,039 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:32,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 21:30:32,039 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:32,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:32,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-21 21:30:32,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:32,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407422058] [2020-08-21 21:30:32,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:32,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:32,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:32,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:32,690 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:32,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407422058] [2020-08-21 21:30:32,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:32,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 21:30:32,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384702889] [2020-08-21 21:30:32,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 21:30:32,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:32,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 21:30:32,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:30:32,693 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-21 21:30:33,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:33,686 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-21 21:30:33,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 21:30:33,686 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-21 21:30:33,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:33,688 INFO L225 Difference]: With dead ends: 96 [2020-08-21 21:30:33,688 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 21:30:33,689 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 [2020-08-21 21:30:33,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 21:30:33,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-21 21:30:33,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 21:30:33,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-21 21:30:33,696 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-21 21:30:33,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:33,696 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-21 21:30:33,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 21:30:33,696 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-21 21:30:33,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 21:30:33,697 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:33,697 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:33,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 21:30:33,697 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:33,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:33,697 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-21 21:30:33,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:33,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523979049] [2020-08-21 21:30:33,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:33,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:34,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:34,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:34,367 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:34,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523979049] [2020-08-21 21:30:34,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:34,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 21:30:34,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036678689] [2020-08-21 21:30:34,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 21:30:34,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:34,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 21:30:34,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:30:34,369 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-21 21:30:35,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:35,449 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-21 21:30:35,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 21:30:35,450 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-21 21:30:35,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:35,451 INFO L225 Difference]: With dead ends: 99 [2020-08-21 21:30:35,451 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 21:30:35,452 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 [2020-08-21 21:30:35,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 21:30:35,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-21 21:30:35,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-21 21:30:35,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-21 21:30:35,459 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-21 21:30:35,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:35,459 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-21 21:30:35,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 21:30:35,460 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-21 21:30:35,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-21 21:30:35,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:35,460 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:35,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 21:30:35,461 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:35,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:35,461 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-21 21:30:35,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:35,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1548823827] [2020-08-21 21:30:35,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:35,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:36,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:36,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:36,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:36,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1548823827] [2020-08-21 21:30:36,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:36,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 21:30:36,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155210217] [2020-08-21 21:30:36,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 21:30:36,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:36,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 21:30:36,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:30:36,184 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-21 21:30:37,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:37,324 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-21 21:30:37,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 21:30:37,324 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-21 21:30:37,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:37,325 INFO L225 Difference]: With dead ends: 102 [2020-08-21 21:30:37,325 INFO L226 Difference]: Without dead ends: 97 [2020-08-21 21:30:37,326 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 [2020-08-21 21:30:37,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-21 21:30:37,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-21 21:30:37,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 21:30:37,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-21 21:30:37,333 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-21 21:30:37,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:37,334 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-21 21:30:37,334 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 21:30:37,334 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-21 21:30:37,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 21:30:37,335 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:37,335 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:37,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 21:30:37,335 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:37,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:37,335 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-21 21:30:37,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:37,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2101645378] [2020-08-21 21:30:37,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:37,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:38,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:38,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:38,089 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:38,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2101645378] [2020-08-21 21:30:38,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:38,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 21:30:38,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496664979] [2020-08-21 21:30:38,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 21:30:38,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:38,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 21:30:38,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:30:38,092 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-21 21:30:39,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:39,322 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-21 21:30:39,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 21:30:39,322 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-21 21:30:39,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:39,323 INFO L225 Difference]: With dead ends: 105 [2020-08-21 21:30:39,323 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 21:30:39,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:30:39,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 21:30:39,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-21 21:30:39,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-21 21:30:39,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-21 21:30:39,334 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-21 21:30:39,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:39,335 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-21 21:30:39,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 21:30:39,335 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-21 21:30:39,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-21 21:30:39,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:39,336 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:39,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 21:30:39,337 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:39,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:39,337 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-21 21:30:39,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:39,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [243463500] [2020-08-21 21:30:39,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:39,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:40,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:40,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:40,167 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:40,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [243463500] [2020-08-21 21:30:40,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:40,167 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 21:30:40,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141346381] [2020-08-21 21:30:40,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 21:30:40,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:40,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 21:30:40,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:30:40,169 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-21 21:30:41,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:41,477 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-21 21:30:41,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 21:30:41,478 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-21 21:30:41,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:41,479 INFO L225 Difference]: With dead ends: 108 [2020-08-21 21:30:41,480 INFO L226 Difference]: Without dead ends: 103 [2020-08-21 21:30:41,481 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 [2020-08-21 21:30:41,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-21 21:30:41,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-21 21:30:41,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 21:30:41,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-21 21:30:41,489 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-21 21:30:41,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:41,489 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-21 21:30:41,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 21:30:41,489 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-21 21:30:41,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 21:30:41,490 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:41,490 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:41,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 21:30:41,491 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:41,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:41,491 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-21 21:30:41,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:41,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [17063869] [2020-08-21 21:30:41,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:41,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:42,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:42,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:42,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:42,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [17063869] [2020-08-21 21:30:42,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:42,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 21:30:42,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125141514] [2020-08-21 21:30:42,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 21:30:42,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:42,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 21:30:42,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:30:42,320 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-21 21:30:43,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:43,701 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-21 21:30:43,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 21:30:43,706 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-21 21:30:43,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:43,707 INFO L225 Difference]: With dead ends: 111 [2020-08-21 21:30:43,707 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 21:30:43,708 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 [2020-08-21 21:30:43,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 21:30:43,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-21 21:30:43,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-21 21:30:43,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-21 21:30:43,718 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-21 21:30:43,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:43,719 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-21 21:30:43,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 21:30:43,719 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-21 21:30:43,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-21 21:30:43,720 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:43,720 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:43,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 21:30:43,720 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:43,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:43,720 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-21 21:30:43,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:43,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [361228315] [2020-08-21 21:30:43,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:43,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:44,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:44,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:44,602 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:44,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [361228315] [2020-08-21 21:30:44,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:44,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 21:30:44,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900897253] [2020-08-21 21:30:44,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 21:30:44,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:44,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 21:30:44,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:30:44,604 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-21 21:30:46,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:46,100 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-21 21:30:46,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 21:30:46,100 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-21 21:30:46,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:46,101 INFO L225 Difference]: With dead ends: 114 [2020-08-21 21:30:46,101 INFO L226 Difference]: Without dead ends: 109 [2020-08-21 21:30:46,102 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 [2020-08-21 21:30:46,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-21 21:30:46,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-21 21:30:46,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 21:30:46,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-21 21:30:46,111 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-21 21:30:46,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:46,112 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-21 21:30:46,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 21:30:46,112 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-21 21:30:46,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-21 21:30:46,113 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:46,113 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:46,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 21:30:46,113 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:46,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:46,113 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-21 21:30:46,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:46,114 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1695196979] [2020-08-21 21:30:46,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:46,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:47,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:47,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:47,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:47,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1695196979] [2020-08-21 21:30:47,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:47,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 21:30:47,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538969273] [2020-08-21 21:30:47,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 21:30:47,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:47,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 21:30:47,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:30:47,095 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-21 21:30:48,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:48,686 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-21 21:30:48,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 21:30:48,687 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-21 21:30:48,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:48,689 INFO L225 Difference]: With dead ends: 117 [2020-08-21 21:30:48,689 INFO L226 Difference]: Without dead ends: 112 [2020-08-21 21:30:48,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:30:48,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-21 21:30:48,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-21 21:30:48,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-21 21:30:48,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-21 21:30:48,699 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-21 21:30:48,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:48,700 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-21 21:30:48,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 21:30:48,700 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-21 21:30:48,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-21 21:30:48,704 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:48,704 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:48,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 21:30:48,704 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:48,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:48,705 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-21 21:30:48,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:48,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70984298] [2020-08-21 21:30:48,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:48,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:49,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:49,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:49,725 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:49,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70984298] [2020-08-21 21:30:49,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:49,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 21:30:49,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467466927] [2020-08-21 21:30:49,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 21:30:49,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:49,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 21:30:49,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:30:49,727 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-21 21:30:51,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:51,420 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-21 21:30:51,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 21:30:51,421 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-21 21:30:51,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:51,423 INFO L225 Difference]: With dead ends: 120 [2020-08-21 21:30:51,423 INFO L226 Difference]: Without dead ends: 115 [2020-08-21 21:30:51,424 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 [2020-08-21 21:30:51,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-21 21:30:51,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-21 21:30:51,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-21 21:30:51,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-21 21:30:51,433 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-21 21:30:51,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:51,434 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-21 21:30:51,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 21:30:51,434 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-21 21:30:51,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-21 21:30:51,435 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:51,435 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:51,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 21:30:51,435 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:51,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:51,436 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-21 21:30:51,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:51,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1907947469] [2020-08-21 21:30:51,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:51,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:52,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:52,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:52,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:52,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1907947469] [2020-08-21 21:30:52,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:52,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 21:30:52,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074557164] [2020-08-21 21:30:52,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 21:30:52,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:52,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 21:30:52,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:30:52,518 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-21 21:30:54,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:54,298 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-21 21:30:54,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 21:30:54,299 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-21 21:30:54,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:54,301 INFO L225 Difference]: With dead ends: 123 [2020-08-21 21:30:54,301 INFO L226 Difference]: Without dead ends: 118 [2020-08-21 21:30:54,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:30:54,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-21 21:30:54,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-21 21:30:54,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-21 21:30:54,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-21 21:30:54,313 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-21 21:30:54,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:54,313 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-21 21:30:54,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 21:30:54,313 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-21 21:30:54,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-21 21:30:54,314 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:54,314 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:54,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 21:30:54,315 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:54,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:54,315 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-21 21:30:54,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:54,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278912825] [2020-08-21 21:30:54,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:54,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:55,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:55,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:55,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:55,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278912825] [2020-08-21 21:30:55,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:55,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 21:30:55,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877152150] [2020-08-21 21:30:55,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 21:30:55,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:55,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 21:30:55,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:30:55,457 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-21 21:30:57,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:57,331 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-21 21:30:57,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 21:30:57,331 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-21 21:30:57,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:57,332 INFO L225 Difference]: With dead ends: 126 [2020-08-21 21:30:57,332 INFO L226 Difference]: Without dead ends: 121 [2020-08-21 21:30:57,333 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 [2020-08-21 21:30:57,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-21 21:30:57,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-21 21:30:57,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-21 21:30:57,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-21 21:30:57,342 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-21 21:30:57,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:57,342 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-21 21:30:57,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 21:30:57,343 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-21 21:30:57,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-21 21:30:57,343 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:57,343 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:57,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 21:30:57,344 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:57,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:57,344 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-21 21:30:57,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:57,344 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1181912991] [2020-08-21 21:30:57,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:57,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:58,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:58,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:58,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:58,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1181912991] [2020-08-21 21:30:58,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:58,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 21:30:58,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937160368] [2020-08-21 21:30:58,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 21:30:58,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:58,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 21:30:58,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:30:58,550 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-21 21:31:00,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:31:00,572 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-21 21:31:00,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 21:31:00,573 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-21 21:31:00,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:31:00,574 INFO L225 Difference]: With dead ends: 129 [2020-08-21 21:31:00,574 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 21:31:00,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:31:00,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 21:31:00,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-21 21:31:00,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-21 21:31:00,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-21 21:31:00,584 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-21 21:31:00,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:31:00,585 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-21 21:31:00,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 21:31:00,585 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-21 21:31:00,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-21 21:31:00,586 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:31:00,586 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:31:00,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 21:31:00,586 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:31:00,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:31:00,587 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-21 21:31:00,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:31:00,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [652991273] [2020-08-21 21:31:00,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:31:00,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:31:01,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:31:01,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:31:01,848 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:31:01,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [652991273] [2020-08-21 21:31:01,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:31:01,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 21:31:01,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34927653] [2020-08-21 21:31:01,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 21:31:01,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:31:01,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 21:31:01,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:31:01,850 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-21 21:31:04,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:31:04,010 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-21 21:31:04,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 21:31:04,010 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-21 21:31:04,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:31:04,012 INFO L225 Difference]: With dead ends: 132 [2020-08-21 21:31:04,012 INFO L226 Difference]: Without dead ends: 127 [2020-08-21 21:31:04,017 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 [2020-08-21 21:31:04,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-21 21:31:04,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-21 21:31:04,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-21 21:31:04,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-21 21:31:04,028 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-21 21:31:04,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:31:04,028 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-21 21:31:04,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 21:31:04,028 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-21 21:31:04,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 21:31:04,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:31:04,029 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:31:04,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 21:31:04,029 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:31:04,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:31:04,030 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-21 21:31:04,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:31:04,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139650958] [2020-08-21 21:31:04,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:31:04,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:31:05,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:31:05,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:31:05,460 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:31:05,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139650958] [2020-08-21 21:31:05,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:31:05,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 21:31:05,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498066876] [2020-08-21 21:31:05,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 21:31:05,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:31:05,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 21:31:05,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 21:31:05,461 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-21 21:31:07,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:31:07,682 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-21 21:31:07,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 21:31:07,683 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-21 21:31:07,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:31:07,685 INFO L225 Difference]: With dead ends: 135 [2020-08-21 21:31:07,685 INFO L226 Difference]: Without dead ends: 130 [2020-08-21 21:31:07,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 21:31:07,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-21 21:31:07,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-21 21:31:07,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-21 21:31:07,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-21 21:31:07,699 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-21 21:31:07,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:31:07,700 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-21 21:31:07,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 21:31:07,700 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-21 21:31:07,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-21 21:31:07,701 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:31:07,701 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:31:07,701 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 21:31:07,702 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:31:07,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:31:07,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-21 21:31:07,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:31:07,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1975740780] [2020-08-21 21:31:07,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:31:07,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:31:09,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:31:09,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:31:09,050 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:31:09,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1975740780] [2020-08-21 21:31:09,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:31:09,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 21:31:09,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468215547] [2020-08-21 21:31:09,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 21:31:09,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:31:09,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 21:31:09,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 21:31:09,052 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-21 21:31:11,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:31:11,381 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-21 21:31:11,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 21:31:11,381 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-21 21:31:11,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:31:11,383 INFO L225 Difference]: With dead ends: 138 [2020-08-21 21:31:11,383 INFO L226 Difference]: Without dead ends: 133 [2020-08-21 21:31:11,385 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 [2020-08-21 21:31:11,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-21 21:31:11,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-21 21:31:11,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-21 21:31:11,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-21 21:31:11,397 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-21 21:31:11,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:31:11,398 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-21 21:31:11,398 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 21:31:11,398 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-21 21:31:11,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-21 21:31:11,399 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:31:11,399 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:31:11,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 21:31:11,399 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:31:11,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:31:11,400 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-21 21:31:11,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:31:11,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1881097618] [2020-08-21 21:31:11,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:31:11,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:31:12,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:31:12,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:31:12,842 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 0 proven. 2460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:31:12,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1881097618] [2020-08-21 21:31:12,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:31:12,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 21:31:12,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867706663] [2020-08-21 21:31:12,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 21:31:12,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:31:12,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 21:31:12,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 21:31:12,844 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states.