/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 20:19:14,694 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:19:14,697 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:19:14,726 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:19:14,727 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:19:14,728 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:19:14,729 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:19:14,738 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:19:14,744 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:19:14,745 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:19:14,746 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:19:14,749 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:19:14,749 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:19:14,750 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:19:14,753 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:19:14,756 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:19:14,757 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:19:14,758 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:19:14,760 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:19:14,765 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:19:14,770 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:19:14,774 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:19:14,776 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:19:14,777 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:19:14,781 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 20:19:14,796 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:19:14,797 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:19:14,798 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:19:14,799 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 20:19:14,853 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:19:14,856 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:19:14,857 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:19:14,858 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:19:14,858 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:19:14,858 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:19:14,859 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:19:14,859 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:19:14,859 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:19:14,859 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:19:14,859 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:19:14,860 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:19:14,860 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:19:14,860 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:19:14,860 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:19:14,860 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:19:14,860 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:19:14,862 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:19:14,862 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:19:14,862 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:19:14,862 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:19:14,863 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:19:14,863 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:19:14,863 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:19:14,863 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:19:14,863 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:19:14,864 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:19:14,864 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:19:14,864 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:19:14,864 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:19:15,140 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:19:15,153 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:19:15,156 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:19:15,158 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:19:15,159 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:19:15,159 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 20:19:15,231 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/eac099161/b86303c2f75f4855b2e783f83a236b6e/FLAG07e22018f [2020-08-18 20:19:15,683 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:19:15,686 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 20:19:15,692 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/eac099161/b86303c2f75f4855b2e783f83a236b6e/FLAG07e22018f [2020-08-18 20:19:16,023 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/eac099161/b86303c2f75f4855b2e783f83a236b6e [2020-08-18 20:19:16,034 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:19:16,036 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:19:16,037 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:19:16,037 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:19:16,041 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:19:16,042 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:19:16" (1/1) ... [2020-08-18 20:19:16,045 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b33d7b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:16, skipping insertion in model container [2020-08-18 20:19:16,045 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:19:16" (1/1) ... [2020-08-18 20:19:16,053 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:19:16,076 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:19:16,267 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:19:16,274 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:19:16,293 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:19:16,309 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:19:16,309 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:16 WrapperNode [2020-08-18 20:19:16,309 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:19:16,310 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:19:16,310 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:19:16,310 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:19:16,402 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:16" (1/1) ... [2020-08-18 20:19:16,403 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:16" (1/1) ... [2020-08-18 20:19:16,411 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:16" (1/1) ... [2020-08-18 20:19:16,411 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:16" (1/1) ... [2020-08-18 20:19:16,421 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:16" (1/1) ... [2020-08-18 20:19:16,426 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:16" (1/1) ... [2020-08-18 20:19:16,427 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:16" (1/1) ... [2020-08-18 20:19:16,430 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:19:16,431 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:19:16,431 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:19:16,431 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:19:16,432 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:16" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:19:16,486 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:19:16,486 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:19:16,486 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-18 20:19:16,487 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:19:16,487 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:19:16,487 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 20:19:16,487 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 20:19:16,487 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 20:19:16,487 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 20:19:16,488 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:19:16,488 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 20:19:16,488 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 20:19:16,488 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 20:19:16,488 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 20:19:16,488 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:19:16,489 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:19:16,820 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:19:16,821 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-18 20:19:16,824 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:19:16 BoogieIcfgContainer [2020-08-18 20:19:16,824 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:19:16,826 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:19:16,826 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:19:16,829 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:19:16,829 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:19:16" (1/3) ... [2020-08-18 20:19:16,830 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f41fea8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:19:16, skipping insertion in model container [2020-08-18 20:19:16,830 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:19:16" (2/3) ... [2020-08-18 20:19:16,830 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f41fea8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:19:16, skipping insertion in model container [2020-08-18 20:19:16,831 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:19:16" (3/3) ... [2020-08-18 20:19:16,832 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-18 20:19:16,843 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:19:16,850 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:19:16,864 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:19:16,883 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:19:16,884 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:19:16,884 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:19:16,884 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:19:16,884 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:19:16,884 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:19:16,884 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:19:16,884 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:19:16,900 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-18 20:19:16,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 20:19:16,906 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:16,908 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:16,908 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:16,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:16,913 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-18 20:19:16,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:16,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [374062402] [2020-08-18 20:19:16,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:17,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:17,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 20:19:17,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:19:17,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [374062402] [2020-08-18 20:19:17,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:19:17,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 20:19:17,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229738751] [2020-08-18 20:19:17,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 20:19:17,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:17,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 20:19:17,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:19:17,201 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-18 20:19:17,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:17,286 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-18 20:19:17,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 20:19:17,288 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-18 20:19:17,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:17,298 INFO L225 Difference]: With dead ends: 42 [2020-08-18 20:19:17,298 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 20:19:17,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 20:19:17,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 20:19:17,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 20:19:17,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 20:19:17,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-18 20:19:17,337 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-18 20:19:17,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:17,338 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-18 20:19:17,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 20:19:17,338 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-18 20:19:17,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 20:19:17,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:17,340 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:17,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:19:17,340 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:17,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:17,341 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-18 20:19:17,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:17,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321804579] [2020-08-18 20:19:17,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:17,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:17,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-18 20:19:17,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:19:17,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321804579] [2020-08-18 20:19:17,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:19:17,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 20:19:17,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596388302] [2020-08-18 20:19:17,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:19:17,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:17,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:19:17,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:19:17,436 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-18 20:19:17,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:17,503 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-18 20:19:17,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:19:17,504 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-18 20:19:17,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:17,505 INFO L225 Difference]: With dead ends: 34 [2020-08-18 20:19:17,505 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 20:19:17,506 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:19:17,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 20:19:17,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 20:19:17,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 20:19:17,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 20:19:17,515 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-18 20:19:17,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:17,516 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 20:19:17,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:19:17,516 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 20:19:17,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 20:19:17,517 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:17,517 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:17,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:19:17,518 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:17,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:17,518 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-18 20:19:17,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:17,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947770434] [2020-08-18 20:19:17,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:17,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:17,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-18 20:19:17,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,602 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:19:17,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947770434] [2020-08-18 20:19:17,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:17,607 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 20:19:17,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [686923402] [2020-08-18 20:19:17,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:19:17,608 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:17,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:19:17,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:19:17,609 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-18 20:19:17,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:17,684 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-18 20:19:17,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:19:17,684 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-18 20:19:17,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:17,685 INFO L225 Difference]: With dead ends: 36 [2020-08-18 20:19:17,686 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 20:19:17,686 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:19:17,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 20:19:17,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 20:19:17,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 20:19:17,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-18 20:19:17,693 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-18 20:19:17,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:17,693 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-18 20:19:17,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:19:17,694 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-18 20:19:17,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 20:19:17,695 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:17,695 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:17,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:19:17,695 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:17,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:17,696 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-18 20:19:17,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:17,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199994335] [2020-08-18 20:19:17,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:17,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:17,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-18 20:19:17,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:17,855 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:19:17,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199994335] [2020-08-18 20:19:17,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:17,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 20:19:17,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633637747] [2020-08-18 20:19:17,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:19:17,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:17,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:19:17,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:19:17,858 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-18 20:19:17,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:17,963 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-18 20:19:17,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:19:17,964 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-18 20:19:17,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:17,965 INFO L225 Difference]: With dead ends: 38 [2020-08-18 20:19:17,965 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 20:19:17,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:19:17,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 20:19:17,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 20:19:17,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 20:19:17,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-18 20:19:17,972 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-18 20:19:17,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:17,972 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-18 20:19:17,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:19:17,972 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-18 20:19:17,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 20:19:17,973 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:17,974 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:17,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 20:19:17,974 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:17,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:17,974 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-18 20:19:17,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:17,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98613537] [2020-08-18 20:19:17,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:17,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:18,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 20:19:18,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,055 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:19:18,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98613537] [2020-08-18 20:19:18,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:18,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 20:19:18,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390861456] [2020-08-18 20:19:18,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 20:19:18,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:18,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 20:19:18,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:19:18,058 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-18 20:19:18,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:18,121 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-18 20:19:18,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 20:19:18,121 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-18 20:19:18,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:18,122 INFO L225 Difference]: With dead ends: 40 [2020-08-18 20:19:18,122 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 20:19:18,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:19:18,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 20:19:18,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 20:19:18,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 20:19:18,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 20:19:18,128 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-18 20:19:18,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:18,129 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 20:19:18,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 20:19:18,129 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 20:19:18,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 20:19:18,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:18,130 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:18,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 20:19:18,131 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:18,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:18,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-18 20:19:18,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:18,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [396516631] [2020-08-18 20:19:18,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:18,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:18,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-18 20:19:18,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,264 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:19:18,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [396516631] [2020-08-18 20:19:18,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:18,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 20:19:18,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380734083] [2020-08-18 20:19:18,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 20:19:18,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:18,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 20:19:18,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:19:18,267 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-18 20:19:18,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:18,329 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-18 20:19:18,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 20:19:18,329 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-18 20:19:18,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:18,330 INFO L225 Difference]: With dead ends: 42 [2020-08-18 20:19:18,330 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 20:19:18,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:19:18,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 20:19:18,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 20:19:18,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 20:19:18,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-18 20:19:18,336 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-18 20:19:18,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:18,337 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-18 20:19:18,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 20:19:18,337 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-18 20:19:18,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 20:19:18,338 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:18,338 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:18,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 20:19:18,339 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:18,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:18,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-18 20:19:18,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:18,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [256876041] [2020-08-18 20:19:18,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:18,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:18,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-18 20:19:18,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,447 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:19:18,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [256876041] [2020-08-18 20:19:18,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:18,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:19:18,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573434854] [2020-08-18 20:19:18,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:19:18,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:18,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:19:18,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:19:18,450 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-18 20:19:18,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:18,534 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-18 20:19:18,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 20:19:18,534 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-18 20:19:18,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:18,535 INFO L225 Difference]: With dead ends: 44 [2020-08-18 20:19:18,536 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 20:19:18,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:19:18,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 20:19:18,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 20:19:18,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 20:19:18,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-18 20:19:18,542 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-18 20:19:18,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:18,542 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-18 20:19:18,542 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:19:18,542 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-18 20:19:18,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 20:19:18,543 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:18,543 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:18,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 20:19:18,544 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:18,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:18,544 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-18 20:19:18,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:18,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [532456983] [2020-08-18 20:19:18,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:18,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:18,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 20:19:18,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,653 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:19:18,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [532456983] [2020-08-18 20:19:18,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:18,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 20:19:18,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468543268] [2020-08-18 20:19:18,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 20:19:18,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:18,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 20:19:18,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:19:18,656 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-18 20:19:18,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:18,741 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-18 20:19:18,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:19:18,741 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-18 20:19:18,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:18,742 INFO L225 Difference]: With dead ends: 46 [2020-08-18 20:19:18,743 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 20:19:18,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:19:18,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 20:19:18,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 20:19:18,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 20:19:18,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-18 20:19:18,749 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-18 20:19:18,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:18,750 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-18 20:19:18,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 20:19:18,750 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-18 20:19:18,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 20:19:18,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:18,751 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:18,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 20:19:18,752 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:18,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:18,752 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-18 20:19:18,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:18,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1034611638] [2020-08-18 20:19:18,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:18,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:18,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-18 20:19:18,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:18,887 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:19:18,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1034611638] [2020-08-18 20:19:18,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:18,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 20:19:18,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590776180] [2020-08-18 20:19:18,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 20:19:18,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:18,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 20:19:18,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:19:18,889 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-18 20:19:18,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:18,983 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 20:19:18,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 20:19:18,984 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-18 20:19:18,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:18,985 INFO L225 Difference]: With dead ends: 48 [2020-08-18 20:19:18,985 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 20:19:18,985 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:19:18,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 20:19:18,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 20:19:18,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 20:19:18,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-18 20:19:18,991 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-18 20:19:18,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:18,991 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-18 20:19:18,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 20:19:18,992 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-18 20:19:18,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 20:19:18,992 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:18,992 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:18,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 20:19:18,993 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:18,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:18,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-18 20:19:18,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:18,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [654606151] [2020-08-18 20:19:18,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:19,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:19,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:19,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:19,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-18 20:19:19,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:19,116 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:19:19,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [654606151] [2020-08-18 20:19:19,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:19,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 20:19:19,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893985535] [2020-08-18 20:19:19,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 20:19:19,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:19,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 20:19:19,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:19:19,118 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-18 20:19:19,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:19,195 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-18 20:19:19,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 20:19:19,195 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 20:19:19,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:19,196 INFO L225 Difference]: With dead ends: 50 [2020-08-18 20:19:19,196 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 20:19:19,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:19:19,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 20:19:19,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 20:19:19,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 20:19:19,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-18 20:19:19,202 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-18 20:19:19,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:19,202 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-18 20:19:19,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 20:19:19,202 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-18 20:19:19,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 20:19:19,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:19,203 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:19,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 20:19:19,204 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:19,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:19,204 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-18 20:19:19,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:19,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [848509456] [2020-08-18 20:19:19,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:19,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:19,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:19:19,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:19,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-18 20:19:19,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:19,341 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:19:19,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [848509456] [2020-08-18 20:19:19,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:19:19,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:19:19,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830071749] [2020-08-18 20:19:19,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:19:19,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:19:19,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:19:19,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:19:19,343 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-18 20:19:19,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:19:19,429 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-18 20:19:19,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 20:19:19,429 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 20:19:19,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:19:19,430 INFO L225 Difference]: With dead ends: 51 [2020-08-18 20:19:19,430 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 20:19:19,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:19:19,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 20:19:19,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 20:19:19,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 20:19:19,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-18 20:19:19,436 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-18 20:19:19,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:19:19,436 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-18 20:19:19,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:19:19,436 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-18 20:19:19,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 20:19:19,437 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:19:19,437 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:19:19,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 20:19:19,438 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:19:19,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:19:19,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-18 20:19:19,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:19:19,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1237626931] [2020-08-18 20:19:19,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:19:19,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:19:28,945 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-18 20:19:30,010 WARN L193 SmtUtils]: Spent 842.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-18 20:19:33,946 WARN L193 SmtUtils]: Spent 3.57 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-18 20:20:01,591 WARN L193 SmtUtils]: Spent 26.81 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-18 20:20:01,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:20:01,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:20:01,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-18 20:20:01,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:20:01,978 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 20:20:01,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1237626931] [2020-08-18 20:20:01,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:20:01,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 20:20:01,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055308848] [2020-08-18 20:20:01,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 20:20:01,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:20:01,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 20:20:01,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:20:01,981 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-18 20:20:02,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:20:02,481 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-18 20:20:02,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 20:20:02,481 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 20:20:02,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:20:02,482 INFO L225 Difference]: With dead ends: 49 [2020-08-18 20:20:02,483 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 20:20:02,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 32.8s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-18 20:20:02,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 20:20:02,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 20:20:02,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 20:20:02,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-18 20:20:02,499 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-18 20:20:02,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:20:02,499 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-18 20:20:02,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 20:20:02,499 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-18 20:20:02,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 20:20:02,500 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:20:02,500 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:20:02,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 20:20:02,501 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:20:02,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:20:02,501 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-18 20:20:02,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:20:02,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505613374] [2020-08-18 20:20:02,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:20:02,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:20:06,643 WARN L193 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-18 20:20:07,806 WARN L193 SmtUtils]: Spent 937.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-18 20:20:12,039 WARN L193 SmtUtils]: Spent 3.82 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-18 20:20:12,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:20:12,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:20:12,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-18 20:20:12,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:20:12,622 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 20:20:12,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505613374] [2020-08-18 20:20:12,622 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:20:12,623 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 20:20:12,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984760700] [2020-08-18 20:20:12,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 20:20:12,624 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:20:12,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 20:20:12,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:20:12,624 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-18 20:20:13,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:20:13,552 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 20:20:13,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 20:20:13,553 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-18 20:20:13,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:20:13,555 INFO L225 Difference]: With dead ends: 48 [2020-08-18 20:20:13,555 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 20:20:13,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:20:13,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 20:20:13,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 20:20:13,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 20:20:13,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-18 20:20:13,574 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-18 20:20:13,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:20:13,574 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-18 20:20:13,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 20:20:13,574 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-18 20:20:13,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 20:20:13,578 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:20:13,578 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:20:13,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 20:20:13,579 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:20:13,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:20:13,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-18 20:20:13,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:20:13,580 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1754763557] [2020-08-18 20:20:13,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:20:13,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat