/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=NARROWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:02:56,847 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:02:56,849 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:02:56,872 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 22:02:56,872 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 22:02:56,873 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 22:02:56,875 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 22:02:56,877 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 22:02:56,878 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 22:02:56,879 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 22:02:56,880 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 22:02:56,881 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 22:02:56,882 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:02:56,883 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:02:56,884 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:02:56,885 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:02:56,886 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:02:56,887 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:02:56,888 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:02:56,890 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:02:56,892 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:02:56,893 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:02:56,894 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:02:56,894 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:02:56,897 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 22:02:56,904 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:02:56,905 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:02:56,906 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:02:56,907 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 22:02:56,928 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:02:56,928 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:02:56,930 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:02:56,930 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:02:56,930 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:02:56,930 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:02:56,931 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:02:56,931 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:02:56,931 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:02:56,931 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:02:56,931 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:02:56,932 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:02:56,932 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:02:56,933 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:02:56,934 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:02:56,934 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:02:56,934 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:02:56,934 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:02:56,934 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:02:56,935 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:02:56,935 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:02:56,935 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:02:56,935 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:02:56,935 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:02:56,936 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:02:56,936 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:02:56,936 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:02:56,936 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:02:56,936 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:02:56,937 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=NARROWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; [2020-08-18 22:02:57,234 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:02:57,250 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:02:57,254 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:02:57,256 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:02:57,256 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:02:57,257 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 22:02:57,318 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5188ed5af/79455ad76c4e4607ad44e92389ec0600/FLAG863e5a671 [2020-08-18 22:02:57,725 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:02:57,728 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-18 22:02:57,735 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5188ed5af/79455ad76c4e4607ad44e92389ec0600/FLAG863e5a671 [2020-08-18 22:02:58,072 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5188ed5af/79455ad76c4e4607ad44e92389ec0600 [2020-08-18 22:02:58,080 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:02:58,082 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:02:58,083 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:02:58,083 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:02:58,087 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:02:58,088 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:02:58" (1/1) ... [2020-08-18 22:02:58,096 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34ebed4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:58, skipping insertion in model container [2020-08-18 22:02:58,096 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:02:58" (1/1) ... [2020-08-18 22:02:58,105 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:02:58,127 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:02:58,348 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:02:58,353 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:02:58,370 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:02:58,385 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:02:58,386 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:58 WrapperNode [2020-08-18 22:02:58,386 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:02:58,387 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:02:58,387 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:02:58,388 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:02:58,401 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:58" (1/1) ... [2020-08-18 22:02:58,402 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:58" (1/1) ... [2020-08-18 22:02:58,407 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:58" (1/1) ... [2020-08-18 22:02:58,408 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:58" (1/1) ... [2020-08-18 22:02:58,412 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:58" (1/1) ... [2020-08-18 22:02:58,417 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:58" (1/1) ... [2020-08-18 22:02:58,418 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:58" (1/1) ... [2020-08-18 22:02:58,419 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:02:58,420 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:02:58,420 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:02:58,420 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:02:58,421 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:58" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:02:58,568 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:02:58,569 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:02:58,569 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 22:02:58,569 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 22:02:58,569 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:02:58,569 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:02:58,569 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 22:02:58,569 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 22:02:58,570 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 22:02:58,570 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 22:02:58,570 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:02:58,570 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:02:58,570 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:02:58,760 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:02:58,761 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 22:02:58,764 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:02:58 BoogieIcfgContainer [2020-08-18 22:02:58,764 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:02:58,766 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:02:58,766 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:02:58,770 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:02:58,771 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:02:58" (1/3) ... [2020-08-18 22:02:58,772 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25769489 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:02:58, skipping insertion in model container [2020-08-18 22:02:58,773 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:58" (2/3) ... [2020-08-18 22:02:58,774 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25769489 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:02:58, skipping insertion in model container [2020-08-18 22:02:58,774 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:02:58" (3/3) ... [2020-08-18 22:02:58,778 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-18 22:02:58,787 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:02:58,795 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:02:58,810 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:02:58,836 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:02:58,836 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:02:58,836 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:02:58,837 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:02:58,837 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:02:58,837 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:02:58,837 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:02:58,837 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:02:58,856 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-18 22:02:58,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 22:02:58,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:58,863 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:58,863 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:58,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:58,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-18 22:02:58,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:58,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817942923] [2020-08-18 22:02:58,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:58,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:58,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:58,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:58,980 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:58,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817942923] [2020-08-18 22:02:58,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:58,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 22:02:58,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186291382] [2020-08-18 22:02:58,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 22:02:58,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:59,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 22:02:59,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 22:02:59,004 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-18 22:02:59,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:59,025 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-18 22:02:59,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 22:02:59,027 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-18 22:02:59,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:59,036 INFO L225 Difference]: With dead ends: 32 [2020-08-18 22:02:59,036 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 22:02:59,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 22:02:59,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 22:02:59,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 22:02:59,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 22:02:59,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-18 22:02:59,082 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-18 22:02:59,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:59,083 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-18 22:02:59,083 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 22:02:59,083 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-18 22:02:59,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 22:02:59,084 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:59,084 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:59,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:02:59,085 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:59,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:59,086 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-18 22:02:59,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:59,087 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1668602271] [2020-08-18 22:02:59,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:59,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:59,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:59,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:59,219 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:59,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1668602271] [2020-08-18 22:02:59,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:59,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 22:02:59,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012176817] [2020-08-18 22:02:59,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:02:59,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:59,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:02:59,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:02:59,231 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-18 22:02:59,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:59,315 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-18 22:02:59,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:02:59,316 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 22:02:59,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:59,317 INFO L225 Difference]: With dead ends: 21 [2020-08-18 22:02:59,318 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 22:02:59,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:02:59,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 22:02:59,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 22:02:59,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 22:02:59,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 22:02:59,332 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-18 22:02:59,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:59,333 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 22:02:59,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:02:59,333 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 22:02:59,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 22:02:59,334 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:59,334 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:59,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:02:59,335 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:59,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:59,336 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-18 22:02:59,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:59,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [682208732] [2020-08-18 22:02:59,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:59,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:59,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:59,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:59,425 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:59,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [682208732] [2020-08-18 22:02:59,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:59,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 22:02:59,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757925611] [2020-08-18 22:02:59,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 22:02:59,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:59,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 22:02:59,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:02:59,429 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-18 22:02:59,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:59,499 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 22:02:59,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:02:59,500 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-18 22:02:59,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:59,501 INFO L225 Difference]: With dead ends: 24 [2020-08-18 22:02:59,501 INFO L226 Difference]: Without dead ends: 19 [2020-08-18 22:02:59,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:02:59,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-18 22:02:59,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-18 22:02:59,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 22:02:59,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-18 22:02:59,508 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-18 22:02:59,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:59,509 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-18 22:02:59,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 22:02:59,509 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-18 22:02:59,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 22:02:59,510 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:59,510 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:59,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:02:59,511 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:59,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:59,512 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-18 22:02:59,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:59,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1770980661] [2020-08-18 22:02:59,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:59,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:59,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:59,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:59,647 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:59,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1770980661] [2020-08-18 22:02:59,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:59,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:02:59,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826476908] [2020-08-18 22:02:59,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:02:59,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:59,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:02:59,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:02:59,650 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-18 22:02:59,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:59,729 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-18 22:02:59,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 22:02:59,729 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 22:02:59,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:59,730 INFO L225 Difference]: With dead ends: 27 [2020-08-18 22:02:59,730 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 22:02:59,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:02:59,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 22:02:59,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-18 22:02:59,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 22:02:59,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-18 22:02:59,738 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-18 22:02:59,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:59,738 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-18 22:02:59,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:02:59,739 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-18 22:02:59,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 22:02:59,740 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:59,740 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:59,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:02:59,740 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:59,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:59,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-18 22:02:59,741 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:59,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [996832214] [2020-08-18 22:02:59,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:59,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:59,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:59,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:59,870 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:59,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [996832214] [2020-08-18 22:02:59,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:59,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:02:59,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713984464] [2020-08-18 22:02:59,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:02:59,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:59,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:02:59,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:02:59,875 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-18 22:02:59,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:59,990 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-18 22:02:59,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 22:02:59,992 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-18 22:02:59,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:59,994 INFO L225 Difference]: With dead ends: 30 [2020-08-18 22:02:59,994 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 22:02:59,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:02:59,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 22:03:00,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 22:03:00,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 22:03:00,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-18 22:03:00,020 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-18 22:03:00,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:00,021 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-18 22:03:00,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:03:00,022 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-18 22:03:00,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 22:03:00,022 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:00,023 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:00,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:03:00,023 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:00,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:00,025 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-18 22:03:00,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:00,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076413655] [2020-08-18 22:03:00,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:00,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:00,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,212 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:00,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1076413655] [2020-08-18 22:03:00,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:00,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:03:00,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363358016] [2020-08-18 22:03:00,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:03:00,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:00,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:03:00,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:03:00,215 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-18 22:03:00,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:00,324 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-18 22:03:00,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:03:00,325 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-18 22:03:00,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:00,326 INFO L225 Difference]: With dead ends: 33 [2020-08-18 22:03:00,326 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 22:03:00,326 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:03:00,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 22:03:00,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 22:03:00,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 22:03:00,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-18 22:03:00,333 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-18 22:03:00,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:00,333 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-18 22:03:00,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:03:00,333 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-18 22:03:00,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 22:03:00,334 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:00,335 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:00,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:03:00,335 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:00,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:00,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-18 22:03:00,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:00,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504434103] [2020-08-18 22:03:00,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:00,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:00,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,506 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:00,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504434103] [2020-08-18 22:03:00,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:00,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 22:03:00,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935921591] [2020-08-18 22:03:00,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 22:03:00,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:00,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 22:03:00,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:03:00,509 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-18 22:03:00,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:00,626 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-18 22:03:00,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:03:00,627 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 22:03:00,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:00,628 INFO L225 Difference]: With dead ends: 36 [2020-08-18 22:03:00,628 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 22:03:00,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:03:00,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 22:03:00,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-18 22:03:00,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 22:03:00,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-18 22:03:00,635 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-18 22:03:00,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:00,636 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-18 22:03:00,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 22:03:00,636 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-18 22:03:00,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 22:03:00,637 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:00,637 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:00,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:03:00,637 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:00,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:00,638 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-18 22:03:00,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:00,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477726070] [2020-08-18 22:03:00,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:00,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:00,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,763 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:00,763 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477726070] [2020-08-18 22:03:00,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:00,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 22:03:00,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335840627] [2020-08-18 22:03:00,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:03:00,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:00,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:03:00,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:03:00,766 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-18 22:03:00,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:00,896 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-18 22:03:00,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 22:03:00,897 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 22:03:00,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:00,898 INFO L225 Difference]: With dead ends: 39 [2020-08-18 22:03:00,898 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 22:03:00,899 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:03:00,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 22:03:00,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-18 22:03:00,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 22:03:00,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-18 22:03:00,905 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-18 22:03:00,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:00,906 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-18 22:03:00,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:03:00,906 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-18 22:03:00,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 22:03:00,907 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:00,907 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:00,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:03:00,907 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:00,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:00,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-18 22:03:00,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:00,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930287209] [2020-08-18 22:03:00,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:00,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:01,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:01,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:01,057 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:01,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930287209] [2020-08-18 22:03:01,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:01,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 22:03:01,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749087990] [2020-08-18 22:03:01,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 22:03:01,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:01,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 22:03:01,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:03:01,061 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-18 22:03:01,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:01,230 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-18 22:03:01,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 22:03:01,231 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-18 22:03:01,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:01,232 INFO L225 Difference]: With dead ends: 42 [2020-08-18 22:03:01,232 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 22:03:01,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:03:01,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 22:03:01,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 22:03:01,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 22:03:01,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-18 22:03:01,239 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-18 22:03:01,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:01,240 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-18 22:03:01,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 22:03:01,240 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-18 22:03:01,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 22:03:01,241 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:01,241 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:01,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:03:01,242 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:01,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:01,242 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-18 22:03:01,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:01,243 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974061927] [2020-08-18 22:03:01,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:01,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:01,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:01,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:01,401 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:01,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974061927] [2020-08-18 22:03:01,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:01,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:03:01,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495080085] [2020-08-18 22:03:01,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:03:01,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:01,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:03:01,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:03:01,404 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-18 22:03:01,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:01,582 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-18 22:03:01,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 22:03:01,583 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 22:03:01,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:01,584 INFO L225 Difference]: With dead ends: 45 [2020-08-18 22:03:01,584 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 22:03:01,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:03:01,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 22:03:01,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-18 22:03:01,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 22:03:01,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-18 22:03:01,594 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-18 22:03:01,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:01,594 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-18 22:03:01,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:03:01,594 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-18 22:03:01,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 22:03:01,595 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:01,596 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:01,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:03:01,596 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:01,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:01,596 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-18 22:03:01,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:01,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [316312577] [2020-08-18 22:03:01,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:01,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:01,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:01,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:01,766 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:01,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [316312577] [2020-08-18 22:03:01,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:01,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 22:03:01,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107879119] [2020-08-18 22:03:01,767 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 22:03:01,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:01,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 22:03:01,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:03:01,768 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-18 22:03:01,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:01,963 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-18 22:03:01,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 22:03:01,964 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-18 22:03:01,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:01,965 INFO L225 Difference]: With dead ends: 48 [2020-08-18 22:03:01,965 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 22:03:01,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:03:01,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 22:03:01,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 22:03:01,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 22:03:01,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-18 22:03:01,973 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-18 22:03:01,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:01,973 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-18 22:03:01,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 22:03:01,973 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-18 22:03:01,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 22:03:01,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:01,975 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:01,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:03:01,975 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:01,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:01,975 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-18 22:03:01,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:01,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1364704881] [2020-08-18 22:03:01,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:01,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:02,205 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:02,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:02,210 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:02,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1364704881] [2020-08-18 22:03:02,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:02,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 22:03:02,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540858881] [2020-08-18 22:03:02,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 22:03:02,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:02,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 22:03:02,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:03:02,213 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-18 22:03:02,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:02,459 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-18 22:03:02,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 22:03:02,460 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-18 22:03:02,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:02,461 INFO L225 Difference]: With dead ends: 51 [2020-08-18 22:03:02,462 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 22:03:02,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:03:02,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 22:03:02,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-18 22:03:02,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 22:03:02,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-18 22:03:02,470 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-18 22:03:02,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:02,470 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-18 22:03:02,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 22:03:02,470 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-18 22:03:02,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 22:03:02,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:02,471 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:02,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 22:03:02,472 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:02,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:02,472 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-18 22:03:02,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:02,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [745234221] [2020-08-18 22:03:02,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:02,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:02,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:02,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:02,677 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:02,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [745234221] [2020-08-18 22:03:02,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:02,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 22:03:02,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402370045] [2020-08-18 22:03:02,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 22:03:02,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:02,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 22:03:02,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:03:02,679 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-18 22:03:02,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:02,965 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-18 22:03:02,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 22:03:02,965 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-18 22:03:02,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:02,967 INFO L225 Difference]: With dead ends: 54 [2020-08-18 22:03:02,967 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 22:03:02,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:03:02,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 22:03:02,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 22:03:02,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 22:03:02,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-18 22:03:02,974 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-18 22:03:02,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:02,974 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-18 22:03:02,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 22:03:02,975 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-18 22:03:02,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 22:03:02,975 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:02,976 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:02,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 22:03:02,976 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:02,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:02,976 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-18 22:03:02,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:02,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1398798938] [2020-08-18 22:03:02,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:03,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:03,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:03,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:03,229 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:03,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1398798938] [2020-08-18 22:03:03,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:03,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 22:03:03,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657892070] [2020-08-18 22:03:03,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 22:03:03,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:03,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 22:03:03,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:03:03,232 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-18 22:03:03,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:03,536 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-18 22:03:03,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 22:03:03,537 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 22:03:03,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:03,538 INFO L225 Difference]: With dead ends: 57 [2020-08-18 22:03:03,538 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 22:03:03,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:03:03,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 22:03:03,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-18 22:03:03,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 22:03:03,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-18 22:03:03,546 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-18 22:03:03,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:03,547 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-18 22:03:03,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 22:03:03,547 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-18 22:03:03,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 22:03:03,548 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:03,548 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:03,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 22:03:03,548 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:03,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:03,549 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-18 22:03:03,549 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:03,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [692776615] [2020-08-18 22:03:03,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:03,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:03,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:03,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:03,827 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:03,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [692776615] [2020-08-18 22:03:03,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:03,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 22:03:03,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857865255] [2020-08-18 22:03:03,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 22:03:03,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:03,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 22:03:03,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:03:03,830 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-18 22:03:04,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:04,157 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-18 22:03:04,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 22:03:04,157 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-18 22:03:04,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:04,158 INFO L225 Difference]: With dead ends: 60 [2020-08-18 22:03:04,158 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 22:03:04,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:03:04,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 22:03:04,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-18 22:03:04,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 22:03:04,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-18 22:03:04,173 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-18 22:03:04,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:04,174 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-18 22:03:04,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 22:03:04,174 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-18 22:03:04,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 22:03:04,180 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:04,180 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:04,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 22:03:04,180 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:04,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:04,181 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-18 22:03:04,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:04,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1285830978] [2020-08-18 22:03:04,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:04,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:04,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,504 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:04,504 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1285830978] [2020-08-18 22:03:04,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:04,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 22:03:04,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097376464] [2020-08-18 22:03:04,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 22:03:04,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:04,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 22:03:04,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:03:04,512 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-18 22:03:04,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:04,876 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-18 22:03:04,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 22:03:04,876 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-18 22:03:04,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:04,877 INFO L225 Difference]: With dead ends: 63 [2020-08-18 22:03:04,877 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 22:03:04,878 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:03:04,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 22:03:04,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-18 22:03:04,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 22:03:04,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-18 22:03:04,885 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-18 22:03:04,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:04,886 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-18 22:03:04,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 22:03:04,886 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-18 22:03:04,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 22:03:04,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:04,887 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:04,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 22:03:04,888 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:04,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:04,888 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-18 22:03:04,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:04,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1379348339] [2020-08-18 22:03:04,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:04,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:05,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:05,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:05,230 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:05,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1379348339] [2020-08-18 22:03:05,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:05,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 22:03:05,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368205528] [2020-08-18 22:03:05,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 22:03:05,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:05,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 22:03:05,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:03:05,233 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-18 22:03:05,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:05,699 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-18 22:03:05,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 22:03:05,700 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-18 22:03:05,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:05,701 INFO L225 Difference]: With dead ends: 66 [2020-08-18 22:03:05,701 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 22:03:05,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:03:05,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 22:03:05,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-18 22:03:05,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 22:03:05,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-18 22:03:05,708 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-18 22:03:05,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:05,709 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-18 22:03:05,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 22:03:05,709 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-18 22:03:05,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 22:03:05,710 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:05,710 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:05,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 22:03:05,710 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:05,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:05,711 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-18 22:03:05,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:05,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170418737] [2020-08-18 22:03:05,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:05,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:06,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:06,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:06,020 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:06,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170418737] [2020-08-18 22:03:06,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:06,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 22:03:06,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451314169] [2020-08-18 22:03:06,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 22:03:06,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:06,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 22:03:06,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:03:06,022 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-18 22:03:06,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:06,504 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-18 22:03:06,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 22:03:06,504 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-18 22:03:06,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:06,506 INFO L225 Difference]: With dead ends: 69 [2020-08-18 22:03:06,506 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 22:03:06,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:03:06,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 22:03:06,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-18 22:03:06,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 22:03:06,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-18 22:03:06,514 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-18 22:03:06,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:06,514 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-18 22:03:06,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 22:03:06,515 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-18 22:03:06,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 22:03:06,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:06,515 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:06,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 22:03:06,516 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:06,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:06,516 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-18 22:03:06,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:06,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1647747550] [2020-08-18 22:03:06,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:06,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:06,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:06,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:06,891 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:06,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1647747550] [2020-08-18 22:03:06,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:06,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 22:03:06,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165330548] [2020-08-18 22:03:06,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 22:03:06,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:06,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 22:03:06,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:03:06,895 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-18 22:03:07,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:07,353 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-18 22:03:07,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 22:03:07,353 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-18 22:03:07,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:07,354 INFO L225 Difference]: With dead ends: 72 [2020-08-18 22:03:07,354 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 22:03:07,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:03:07,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 22:03:07,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-18 22:03:07,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 22:03:07,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-18 22:03:07,361 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-18 22:03:07,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:07,362 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-18 22:03:07,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 22:03:07,362 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-18 22:03:07,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 22:03:07,363 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:07,363 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:07,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 22:03:07,363 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:07,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:07,364 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-18 22:03:07,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:07,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846937769] [2020-08-18 22:03:07,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:07,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:07,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:07,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:07,765 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:07,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846937769] [2020-08-18 22:03:07,765 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:07,765 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 22:03:07,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691748826] [2020-08-18 22:03:07,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 22:03:07,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:07,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 22:03:07,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:03:07,767 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-18 22:03:08,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:08,308 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-18 22:03:08,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 22:03:08,309 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-18 22:03:08,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:08,310 INFO L225 Difference]: With dead ends: 75 [2020-08-18 22:03:08,310 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 22:03:08,311 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:03:08,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 22:03:08,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-18 22:03:08,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 22:03:08,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-18 22:03:08,318 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-18 22:03:08,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:08,318 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-18 22:03:08,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 22:03:08,319 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-18 22:03:08,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 22:03:08,319 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:08,319 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:08,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 22:03:08,320 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:08,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:08,320 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-18 22:03:08,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:08,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287051916] [2020-08-18 22:03:08,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:08,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:08,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:08,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:08,781 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:08,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287051916] [2020-08-18 22:03:08,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:08,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 22:03:08,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965709562] [2020-08-18 22:03:08,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 22:03:08,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:08,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 22:03:08,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:03:08,783 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-18 22:03:09,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:09,442 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-18 22:03:09,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 22:03:09,443 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-18 22:03:09,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:09,444 INFO L225 Difference]: With dead ends: 78 [2020-08-18 22:03:09,444 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 22:03:09,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:03:09,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 22:03:09,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-18 22:03:09,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 22:03:09,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-18 22:03:09,452 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-18 22:03:09,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:09,452 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-18 22:03:09,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 22:03:09,453 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-18 22:03:09,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 22:03:09,453 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:09,453 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:09,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 22:03:09,454 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:09,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:09,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-18 22:03:09,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:09,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2145865954] [2020-08-18 22:03:09,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:09,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:09,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:09,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:09,887 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:09,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2145865954] [2020-08-18 22:03:09,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:09,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 22:03:09,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019123913] [2020-08-18 22:03:09,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 22:03:09,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:09,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 22:03:09,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:03:09,890 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-18 22:03:10,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:10,608 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-18 22:03:10,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 22:03:10,611 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-18 22:03:10,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:10,612 INFO L225 Difference]: With dead ends: 81 [2020-08-18 22:03:10,612 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 22:03:10,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:03:10,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 22:03:10,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-18 22:03:10,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 22:03:10,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-18 22:03:10,621 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-18 22:03:10,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:10,621 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-18 22:03:10,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 22:03:10,621 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-18 22:03:10,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 22:03:10,622 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:10,622 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:10,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 22:03:10,622 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:10,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:10,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-18 22:03:10,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:10,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [935097213] [2020-08-18 22:03:10,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:10,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:11,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:11,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:11,121 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:11,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [935097213] [2020-08-18 22:03:11,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:11,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 22:03:11,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548556085] [2020-08-18 22:03:11,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 22:03:11,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:11,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 22:03:11,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:03:11,135 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-18 22:03:11,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:11,890 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-18 22:03:11,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 22:03:11,891 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-18 22:03:11,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:11,892 INFO L225 Difference]: With dead ends: 84 [2020-08-18 22:03:11,893 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 22:03:11,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:03:11,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 22:03:11,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-18 22:03:11,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 22:03:11,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-18 22:03:11,900 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-18 22:03:11,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:11,900 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-18 22:03:11,900 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 22:03:11,900 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-18 22:03:11,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 22:03:11,901 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:11,901 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:11,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 22:03:11,902 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:11,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:11,902 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-18 22:03:11,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:11,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1116886924] [2020-08-18 22:03:11,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:11,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:12,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:12,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:12,437 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:12,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1116886924] [2020-08-18 22:03:12,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:12,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 22:03:12,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916067395] [2020-08-18 22:03:12,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 22:03:12,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:12,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 22:03:12,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:03:12,439 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-18 22:03:13,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:13,279 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-18 22:03:13,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 22:03:13,280 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-18 22:03:13,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:13,281 INFO L225 Difference]: With dead ends: 87 [2020-08-18 22:03:13,281 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 22:03:13,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:03:13,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 22:03:13,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-18 22:03:13,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 22:03:13,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-18 22:03:13,287 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-18 22:03:13,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:13,288 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-18 22:03:13,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 22:03:13,288 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-18 22:03:13,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 22:03:13,288 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:13,289 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:13,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 22:03:13,289 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:13,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:13,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-18 22:03:13,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:13,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70217216] [2020-08-18 22:03:13,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:13,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:13,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:13,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:13,862 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:13,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70217216] [2020-08-18 22:03:13,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:13,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 22:03:13,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366044959] [2020-08-18 22:03:13,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 22:03:13,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:13,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 22:03:13,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:03:13,865 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-18 22:03:14,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:14,744 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-18 22:03:14,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 22:03:14,744 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-18 22:03:14,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:14,745 INFO L225 Difference]: With dead ends: 90 [2020-08-18 22:03:14,746 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 22:03:14,747 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 [2020-08-18 22:03:14,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 22:03:14,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-18 22:03:14,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 22:03:14,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-18 22:03:14,754 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-18 22:03:14,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:14,754 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-18 22:03:14,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 22:03:14,754 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-18 22:03:14,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 22:03:14,755 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:14,755 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:14,755 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 22:03:14,756 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:14,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:14,756 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-18 22:03:14,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:14,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053155714] [2020-08-18 22:03:14,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:14,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:15,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:15,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:15,439 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:15,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053155714] [2020-08-18 22:03:15,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:15,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 22:03:15,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573665691] [2020-08-18 22:03:15,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 22:03:15,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:15,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 22:03:15,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:03:15,441 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-18 22:03:16,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:16,385 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-18 22:03:16,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 22:03:16,386 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-18 22:03:16,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:16,387 INFO L225 Difference]: With dead ends: 93 [2020-08-18 22:03:16,387 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 22:03:16,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:03:16,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 22:03:16,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-18 22:03:16,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 22:03:16,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-18 22:03:16,394 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-18 22:03:16,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:16,394 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-18 22:03:16,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 22:03:16,394 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-18 22:03:16,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 22:03:16,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:16,395 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:16,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 22:03:16,396 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:16,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:16,396 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-18 22:03:16,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:16,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [491944404] [2020-08-18 22:03:16,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:16,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:17,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:17,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:17,100 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:17,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [491944404] [2020-08-18 22:03:17,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:17,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 22:03:17,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735738769] [2020-08-18 22:03:17,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 22:03:17,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:17,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 22:03:17,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:03:17,107 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-18 22:03:18,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:18,231 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-18 22:03:18,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 22:03:18,232 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-18 22:03:18,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:18,233 INFO L225 Difference]: With dead ends: 96 [2020-08-18 22:03:18,233 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 22:03:18,234 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:03:18,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 22:03:18,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-18 22:03:18,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 22:03:18,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-18 22:03:18,241 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-18 22:03:18,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:18,241 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-18 22:03:18,241 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 22:03:18,241 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-18 22:03:18,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 22:03:18,242 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:18,242 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:18,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 22:03:18,242 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:18,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:18,243 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-18 22:03:18,243 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:18,243 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1832255147] [2020-08-18 22:03:18,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:18,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:18,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:18,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:18,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:18,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1832255147] [2020-08-18 22:03:18,984 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:18,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 22:03:18,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284527255] [2020-08-18 22:03:18,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 22:03:18,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:18,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 22:03:18,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:03:18,986 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-18 22:03:20,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:20,115 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-18 22:03:20,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 22:03:20,115 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-18 22:03:20,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:20,117 INFO L225 Difference]: With dead ends: 99 [2020-08-18 22:03:20,117 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 22:03:20,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:03:20,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 22:03:20,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-18 22:03:20,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-18 22:03:20,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-18 22:03:20,127 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-18 22:03:20,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:20,128 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-18 22:03:20,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 22:03:20,128 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-18 22:03:20,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-18 22:03:20,129 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:20,129 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:20,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 22:03:20,129 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:20,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:20,130 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-18 22:03:20,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:20,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [141141190] [2020-08-18 22:03:20,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:20,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:20,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:20,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:20,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:20,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [141141190] [2020-08-18 22:03:20,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:20,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 22:03:20,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198778031] [2020-08-18 22:03:20,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 22:03:20,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:20,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 22:03:20,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:03:20,913 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-18 22:03:22,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:22,129 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-18 22:03:22,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 22:03:22,130 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-18 22:03:22,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:22,131 INFO L225 Difference]: With dead ends: 102 [2020-08-18 22:03:22,131 INFO L226 Difference]: Without dead ends: 97 [2020-08-18 22:03:22,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:03:22,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-18 22:03:22,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-18 22:03:22,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 22:03:22,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-18 22:03:22,140 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-18 22:03:22,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:22,140 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-18 22:03:22,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 22:03:22,140 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-18 22:03:22,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 22:03:22,141 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:22,141 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:22,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 22:03:22,142 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:22,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:22,142 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-18 22:03:22,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:22,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1546963793] [2020-08-18 22:03:22,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:22,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:22,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:22,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:22,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:22,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1546963793] [2020-08-18 22:03:22,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:22,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 22:03:22,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698008300] [2020-08-18 22:03:22,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 22:03:22,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:22,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 22:03:22,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:03:22,948 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-18 22:03:24,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:24,188 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-18 22:03:24,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 22:03:24,188 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-18 22:03:24,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:24,189 INFO L225 Difference]: With dead ends: 105 [2020-08-18 22:03:24,189 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 22:03:24,190 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 [2020-08-18 22:03:24,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 22:03:24,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-18 22:03:24,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-18 22:03:24,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-18 22:03:24,198 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-18 22:03:24,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:24,198 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-18 22:03:24,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 22:03:24,198 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-18 22:03:24,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-18 22:03:24,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:24,199 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:24,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 22:03:24,200 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:24,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:24,200 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-18 22:03:24,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:24,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [915939116] [2020-08-18 22:03:24,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:24,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:25,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:25,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:25,068 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:25,068 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [915939116] [2020-08-18 22:03:25,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:25,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 22:03:25,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317851174] [2020-08-18 22:03:25,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 22:03:25,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:25,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 22:03:25,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:03:25,070 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-18 22:03:26,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:26,458 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-18 22:03:26,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 22:03:26,458 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-18 22:03:26,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:26,460 INFO L225 Difference]: With dead ends: 108 [2020-08-18 22:03:26,460 INFO L226 Difference]: Without dead ends: 103 [2020-08-18 22:03:26,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:03:26,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-18 22:03:26,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-18 22:03:26,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 22:03:26,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-18 22:03:26,470 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-18 22:03:26,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:26,470 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-18 22:03:26,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 22:03:26,471 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-18 22:03:26,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 22:03:26,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:26,472 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:26,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 22:03:26,472 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:26,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:26,472 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-18 22:03:26,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:26,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [363323879] [2020-08-18 22:03:26,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:26,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:27,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:27,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:27,377 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:27,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [363323879] [2020-08-18 22:03:27,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:27,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 22:03:27,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274293447] [2020-08-18 22:03:27,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 22:03:27,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:27,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 22:03:27,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:03:27,380 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-18 22:03:28,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:28,815 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-18 22:03:28,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 22:03:28,818 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-18 22:03:28,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:28,819 INFO L225 Difference]: With dead ends: 111 [2020-08-18 22:03:28,819 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 22:03:28,820 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:03:28,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 22:03:28,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-18 22:03:28,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-18 22:03:28,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-18 22:03:28,830 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-18 22:03:28,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:28,831 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-18 22:03:28,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 22:03:28,831 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-18 22:03:28,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-18 22:03:28,832 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:28,832 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:28,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 22:03:28,832 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:28,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:28,833 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-18 22:03:28,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:28,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691032602] [2020-08-18 22:03:28,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:28,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:29,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:29,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:29,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:29,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691032602] [2020-08-18 22:03:29,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:29,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 22:03:29,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262765773] [2020-08-18 22:03:29,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 22:03:29,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:29,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 22:03:29,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:03:29,854 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-18 22:03:31,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:31,402 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-18 22:03:31,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 22:03:31,403 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-18 22:03:31,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:31,404 INFO L225 Difference]: With dead ends: 114 [2020-08-18 22:03:31,404 INFO L226 Difference]: Without dead ends: 109 [2020-08-18 22:03:31,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:03:31,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-18 22:03:31,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-18 22:03:31,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 22:03:31,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-18 22:03:31,414 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-18 22:03:31,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:31,415 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-18 22:03:31,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 22:03:31,415 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-18 22:03:31,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-18 22:03:31,416 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:31,416 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:31,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 22:03:31,417 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:31,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:31,417 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-18 22:03:31,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:31,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556074734] [2020-08-18 22:03:31,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:31,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:32,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:32,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:32,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:32,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556074734] [2020-08-18 22:03:32,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:32,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 22:03:32,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530103512] [2020-08-18 22:03:32,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 22:03:32,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:32,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 22:03:32,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:03:32,385 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-18 22:03:34,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:34,020 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-18 22:03:34,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 22:03:34,021 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-18 22:03:34,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:34,023 INFO L225 Difference]: With dead ends: 117 [2020-08-18 22:03:34,023 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 22:03:34,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:03:34,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 22:03:34,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-18 22:03:34,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-18 22:03:34,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-18 22:03:34,033 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-18 22:03:34,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:34,033 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-18 22:03:34,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 22:03:34,033 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-18 22:03:34,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-18 22:03:34,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:34,036 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:34,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 22:03:34,037 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:34,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:34,037 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-18 22:03:34,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:34,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1690452106] [2020-08-18 22:03:34,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:34,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:35,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:35,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:35,139 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:35,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1690452106] [2020-08-18 22:03:35,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:35,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 22:03:35,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995301998] [2020-08-18 22:03:35,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 22:03:35,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:35,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 22:03:35,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:03:35,141 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-18 22:03:36,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:36,862 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-18 22:03:36,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 22:03:36,863 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-18 22:03:36,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:36,864 INFO L225 Difference]: With dead ends: 120 [2020-08-18 22:03:36,864 INFO L226 Difference]: Without dead ends: 115 [2020-08-18 22:03:36,865 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:03:36,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-18 22:03:36,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-18 22:03:36,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-18 22:03:36,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-18 22:03:36,872 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-18 22:03:36,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:36,873 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-18 22:03:36,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 22:03:36,873 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-18 22:03:36,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-18 22:03:36,874 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:36,874 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:36,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 22:03:36,874 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:36,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:36,875 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-18 22:03:36,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:36,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1906100282] [2020-08-18 22:03:36,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:36,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:37,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:37,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:37,967 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:37,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1906100282] [2020-08-18 22:03:37,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:37,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 22:03:37,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [784683468] [2020-08-18 22:03:37,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 22:03:37,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:37,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 22:03:37,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:03:37,969 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-18 22:03:39,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:39,823 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-18 22:03:39,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 22:03:39,824 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-18 22:03:39,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:39,825 INFO L225 Difference]: With dead ends: 123 [2020-08-18 22:03:39,825 INFO L226 Difference]: Without dead ends: 118 [2020-08-18 22:03:39,826 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 [2020-08-18 22:03:39,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-18 22:03:39,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-18 22:03:39,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-18 22:03:39,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-18 22:03:39,835 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-18 22:03:39,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:39,835 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-18 22:03:39,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 22:03:39,836 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-18 22:03:39,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-18 22:03:39,837 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:39,837 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:39,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 22:03:39,837 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:39,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:39,838 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-18 22:03:39,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:39,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [205248854] [2020-08-18 22:03:39,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:39,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:40,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:40,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:40,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:40,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [205248854] [2020-08-18 22:03:40,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:40,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 22:03:40,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874579027] [2020-08-18 22:03:40,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 22:03:40,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:40,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 22:03:40,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:03:40,987 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-18 22:03:42,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:42,945 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-18 22:03:42,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 22:03:42,946 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-18 22:03:42,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:42,947 INFO L225 Difference]: With dead ends: 126 [2020-08-18 22:03:42,947 INFO L226 Difference]: Without dead ends: 121 [2020-08-18 22:03:42,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:03:42,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-18 22:03:42,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-18 22:03:42,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-18 22:03:42,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-18 22:03:42,958 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-18 22:03:42,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:42,958 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-18 22:03:42,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 22:03:42,958 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-18 22:03:42,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-18 22:03:42,959 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:42,959 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:42,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 22:03:42,959 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:42,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:42,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-18 22:03:42,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:42,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273358569] [2020-08-18 22:03:42,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:42,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:44,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:44,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:44,224 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:44,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273358569] [2020-08-18 22:03:44,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:44,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 22:03:44,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12317996] [2020-08-18 22:03:44,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 22:03:44,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:44,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 22:03:44,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:03:44,227 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-18 22:03:46,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:46,333 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-18 22:03:46,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 22:03:46,334 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-18 22:03:46,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:46,336 INFO L225 Difference]: With dead ends: 129 [2020-08-18 22:03:46,336 INFO L226 Difference]: Without dead ends: 124 [2020-08-18 22:03:46,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 22:03:46,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-18 22:03:46,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-18 22:03:46,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-18 22:03:46,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-18 22:03:46,348 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-18 22:03:46,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:46,348 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-18 22:03:46,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 22:03:46,348 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-18 22:03:46,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-18 22:03:46,349 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:46,349 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:46,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 22:03:46,350 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:46,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:46,350 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-18 22:03:46,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:46,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921438650] [2020-08-18 22:03:46,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:46,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:47,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:47,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:47,717 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:47,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921438650] [2020-08-18 22:03:47,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:47,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 22:03:47,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11144796] [2020-08-18 22:03:47,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 22:03:47,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:47,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 22:03:47,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 22:03:47,719 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-18 22:03:49,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:49,898 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-18 22:03:49,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 22:03:49,899 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-18 22:03:49,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:49,900 INFO L225 Difference]: With dead ends: 132 [2020-08-18 22:03:49,901 INFO L226 Difference]: Without dead ends: 127 [2020-08-18 22:03:49,902 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 22:03:49,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-18 22:03:49,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-18 22:03:49,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-18 22:03:49,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-18 22:03:49,913 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-18 22:03:49,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:49,913 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-18 22:03:49,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 22:03:49,914 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-18 22:03:49,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-18 22:03:49,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:49,915 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:49,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 22:03:49,915 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:49,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:49,915 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-18 22:03:49,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:49,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [556500995] [2020-08-18 22:03:49,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:49,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:51,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:51,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:51,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:51,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [556500995] [2020-08-18 22:03:51,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:51,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 22:03:51,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735798539] [2020-08-18 22:03:51,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 22:03:51,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:51,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 22:03:51,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 22:03:51,291 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-18 22:03:53,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:53,671 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-18 22:03:53,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 22:03:53,672 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-18 22:03:53,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:53,674 INFO L225 Difference]: With dead ends: 135 [2020-08-18 22:03:53,674 INFO L226 Difference]: Without dead ends: 130 [2020-08-18 22:03:53,675 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 [2020-08-18 22:03:53,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-18 22:03:53,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-18 22:03:53,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-18 22:03:53,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-18 22:03:53,686 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-18 22:03:53,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:53,686 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-18 22:03:53,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 22:03:53,686 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-18 22:03:53,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-18 22:03:53,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:53,687 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:53,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 22:03:53,688 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:53,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:53,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-18 22:03:53,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:53,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [454626809] [2020-08-18 22:03:53,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:53,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:55,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:55,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:55,248 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:55,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [454626809] [2020-08-18 22:03:55,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:55,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 22:03:55,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63164043] [2020-08-18 22:03:55,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 22:03:55,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:55,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 22:03:55,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 22:03:55,249 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states.