/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=HIGHLEXORDER -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 19:36:28,047 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 19:36:28,050 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 19:36:28,078 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 19:36:28,078 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 19:36:28,079 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 19:36:28,081 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 19:36:28,083 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 19:36:28,084 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 19:36:28,085 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 19:36:28,086 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 19:36:28,088 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 19:36:28,088 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 19:36:28,089 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 19:36:28,090 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 19:36:28,091 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 19:36:28,092 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 19:36:28,093 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 19:36:28,095 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 19:36:28,097 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 19:36:28,099 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 19:36:28,100 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 19:36:28,101 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 19:36:28,102 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 19:36:28,105 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 19:36:28,112 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 19:36:28,113 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 19:36:28,114 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 19:36:28,115 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 19:36:28,152 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 19:36:28,153 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 19:36:28,154 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 19:36:28,156 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 19:36:28,156 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 19:36:28,156 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 19:36:28,156 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 19:36:28,157 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 19:36:28,157 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 19:36:28,157 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 19:36:28,158 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 19:36:28,158 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 19:36:28,158 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 19:36:28,159 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 19:36:28,160 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 19:36:28,160 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 19:36:28,160 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 19:36:28,160 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 19:36:28,161 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 19:36:28,161 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 19:36:28,161 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 19:36:28,161 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 19:36:28,161 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 19:36:28,162 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 19:36:28,162 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 19:36:28,162 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 19:36:28,162 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 19:36:28,162 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 19:36:28,162 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 19:36:28,163 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=HIGHLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER; [2020-08-18 19:36:28,508 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 19:36:28,519 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 19:36:28,522 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 19:36:28,523 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 19:36:28,524 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 19:36:28,525 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 19:36:28,589 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/38b51efbc/6cbf53b00722421987d80be7aee1b4f2/FLAG81848657a [2020-08-18 19:36:29,024 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 19:36:29,025 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 19:36:29,032 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/38b51efbc/6cbf53b00722421987d80be7aee1b4f2/FLAG81848657a [2020-08-18 19:36:29,423 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/38b51efbc/6cbf53b00722421987d80be7aee1b4f2 [2020-08-18 19:36:29,433 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 19:36:29,434 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 19:36:29,435 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 19:36:29,435 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 19:36:29,439 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 19:36:29,440 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:36:29" (1/1) ... [2020-08-18 19:36:29,443 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d5d5e76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:36:29, skipping insertion in model container [2020-08-18 19:36:29,443 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:36:29" (1/1) ... [2020-08-18 19:36:29,451 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 19:36:29,468 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 19:36:29,691 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:36:29,698 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 19:36:29,715 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:36:29,732 INFO L208 MainTranslator]: Completed translation [2020-08-18 19:36:29,732 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:36:29 WrapperNode [2020-08-18 19:36:29,733 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 19:36:29,734 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 19:36:29,734 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 19:36:29,734 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 19:36:29,828 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:36:29" (1/1) ... [2020-08-18 19:36:29,828 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:36:29" (1/1) ... [2020-08-18 19:36:29,837 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:36:29" (1/1) ... [2020-08-18 19:36:29,837 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:36:29" (1/1) ... [2020-08-18 19:36:29,847 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:36:29" (1/1) ... [2020-08-18 19:36:29,853 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:36:29" (1/1) ... [2020-08-18 19:36:29,854 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:36:29" (1/1) ... [2020-08-18 19:36:29,857 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 19:36:29,857 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 19:36:29,858 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 19:36:29,858 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 19:36:29,859 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:36:29" (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 19:36:29,916 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 19:36:29,916 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 19:36:29,917 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 19:36:29,917 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 19:36:29,918 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 19:36:29,918 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 19:36:29,918 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 19:36:29,918 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 19:36:29,918 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-18 19:36:29,918 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 19:36:29,919 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 19:36:29,919 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 19:36:29,920 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 19:36:29,920 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 19:36:29,920 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 19:36:29,921 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 19:36:29,921 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 19:36:29,921 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 19:36:30,219 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 19:36:30,219 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 19:36:30,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:36:30 BoogieIcfgContainer [2020-08-18 19:36:30,223 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 19:36:30,234 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 19:36:30,234 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 19:36:30,237 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 19:36:30,237 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 07:36:29" (1/3) ... [2020-08-18 19:36:30,238 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f9c4466 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:36:30, skipping insertion in model container [2020-08-18 19:36:30,238 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:36:29" (2/3) ... [2020-08-18 19:36:30,249 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f9c4466 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:36:30, skipping insertion in model container [2020-08-18 19:36:30,249 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:36:30" (3/3) ... [2020-08-18 19:36:30,251 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-18 19:36:30,265 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 19:36:30,273 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 19:36:30,287 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 19:36:30,309 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 19:36:30,310 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 19:36:30,310 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 19:36:30,310 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 19:36:30,310 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 19:36:30,310 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 19:36:30,310 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 19:36:30,310 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 19:36:30,327 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 19:36:30,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 19:36:30,333 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:30,334 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:30,334 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:30,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:30,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-18 19:36:30,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:30,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033848654] [2020-08-18 19:36:30,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:30,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:30,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:30,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:30,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:30,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:30,563 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 19:36:30,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033848654] [2020-08-18 19:36:30,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:36:30,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 19:36:30,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114998153] [2020-08-18 19:36:30,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 19:36:30,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:30,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 19:36:30,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 19:36:30,587 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 19:36:30,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:30,757 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 19:36:30,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 19:36:30,759 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 19:36:30,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:30,770 INFO L225 Difference]: With dead ends: 59 [2020-08-18 19:36:30,771 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 19:36:30,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:36:30,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 19:36:30,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 19:36:30,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 19:36:30,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 19:36:30,811 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 19:36:30,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:30,811 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 19:36:30,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 19:36:30,812 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 19:36:30,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 19:36:30,813 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:30,813 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:30,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 19:36:30,814 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:30,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:30,814 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-18 19:36:30,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:30,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [938703654] [2020-08-18 19:36:30,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:30,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:30,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:30,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:30,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:30,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:30,985 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 19:36:30,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [938703654] [2020-08-18 19:36:30,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:36:30,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 19:36:30,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317045434] [2020-08-18 19:36:30,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 19:36:30,989 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:30,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 19:36:30,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:36:30,990 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 19:36:31,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:31,199 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 19:36:31,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 19:36:31,200 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 19:36:31,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:31,201 INFO L225 Difference]: With dead ends: 48 [2020-08-18 19:36:31,201 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 19:36:31,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-18 19:36:31,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 19:36:31,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 19:36:31,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 19:36:31,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 19:36:31,212 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 19:36:31,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:31,213 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 19:36:31,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 19:36:31,213 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 19:36:31,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 19:36:31,214 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:31,214 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:31,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 19:36:31,215 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:31,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:31,216 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-18 19:36:31,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:31,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [882066147] [2020-08-18 19:36:31,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:31,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:31,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:31,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:31,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:31,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:31,418 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:36:31,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [882066147] [2020-08-18 19:36:31,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:31,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 19:36:31,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324577328] [2020-08-18 19:36:31,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 19:36:31,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:31,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 19:36:31,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 19:36:31,421 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 19:36:31,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:31,594 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 19:36:31,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 19:36:31,595 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 19:36:31,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:31,596 INFO L225 Difference]: With dead ends: 50 [2020-08-18 19:36:31,596 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 19:36:31,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 19:36:31,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 19:36:31,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 19:36:31,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 19:36:31,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 19:36:31,604 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 19:36:31,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:31,605 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 19:36:31,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 19:36:31,605 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 19:36:31,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 19:36:31,606 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:31,606 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:31,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 19:36:31,607 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:31,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:31,607 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-18 19:36:31,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:31,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052118345] [2020-08-18 19:36:31,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:31,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:31,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:31,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:31,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:31,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:31,818 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:36:31,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052118345] [2020-08-18 19:36:31,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:31,819 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 19:36:31,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257726735] [2020-08-18 19:36:31,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 19:36:31,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:31,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 19:36:31,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 19:36:31,822 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 19:36:31,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:31,998 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 19:36:31,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 19:36:31,999 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 19:36:31,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:32,000 INFO L225 Difference]: With dead ends: 52 [2020-08-18 19:36:32,000 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 19:36:32,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 19:36:32,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 19:36:32,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 19:36:32,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 19:36:32,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 19:36:32,008 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 19:36:32,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:32,008 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 19:36:32,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 19:36:32,009 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 19:36:32,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 19:36:32,010 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:32,010 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:32,010 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 19:36:32,010 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:32,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:32,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-18 19:36:32,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:32,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861689843] [2020-08-18 19:36:32,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:32,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:32,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:32,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:32,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:32,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:32,274 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 19:36:32,274 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [861689843] [2020-08-18 19:36:32,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:32,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 19:36:32,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719786369] [2020-08-18 19:36:32,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 19:36:32,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:32,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 19:36:32,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 19:36:32,277 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 19:36:32,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:32,486 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 19:36:32,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 19:36:32,486 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 19:36:32,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:32,487 INFO L225 Difference]: With dead ends: 54 [2020-08-18 19:36:32,487 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 19:36:32,488 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-18 19:36:32,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 19:36:32,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 19:36:32,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 19:36:32,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 19:36:32,494 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 19:36:32,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:32,495 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 19:36:32,495 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 19:36:32,495 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 19:36:32,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 19:36:32,496 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:32,496 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:32,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 19:36:32,497 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:32,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:32,498 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-18 19:36:32,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:32,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463067178] [2020-08-18 19:36:32,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:32,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:32,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:32,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:32,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:32,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:32,822 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:36:32,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463067178] [2020-08-18 19:36:32,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:32,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 19:36:32,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567089316] [2020-08-18 19:36:32,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 19:36:32,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:32,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 19:36:32,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 19:36:32,825 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 19:36:33,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:33,006 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 19:36:33,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 19:36:33,006 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 19:36:33,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:33,007 INFO L225 Difference]: With dead ends: 56 [2020-08-18 19:36:33,008 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 19:36:33,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-18 19:36:33,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 19:36:33,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 19:36:33,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 19:36:33,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 19:36:33,020 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 19:36:33,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:33,021 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 19:36:33,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 19:36:33,021 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 19:36:33,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 19:36:33,022 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:33,023 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:33,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 19:36:33,024 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:33,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:33,024 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-18 19:36:33,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:33,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437324338] [2020-08-18 19:36:33,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:33,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:33,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:33,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:33,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:33,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:33,386 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:36:33,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437324338] [2020-08-18 19:36:33,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:33,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 19:36:33,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338107859] [2020-08-18 19:36:33,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 19:36:33,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:33,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 19:36:33,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 19:36:33,390 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 19:36:33,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:33,588 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 19:36:33,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 19:36:33,589 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 19:36:33,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:33,590 INFO L225 Difference]: With dead ends: 58 [2020-08-18 19:36:33,590 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 19:36:33,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-18 19:36:33,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 19:36:33,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 19:36:33,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 19:36:33,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 19:36:33,600 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 19:36:33,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:33,602 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 19:36:33,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 19:36:33,602 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 19:36:33,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 19:36:33,605 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:33,605 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:33,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 19:36:33,605 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:33,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:33,606 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-18 19:36:33,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:33,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142444502] [2020-08-18 19:36:33,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:33,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:33,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:33,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:33,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:33,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:33,955 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:36:33,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142444502] [2020-08-18 19:36:33,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:33,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 19:36:33,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175062879] [2020-08-18 19:36:33,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 19:36:33,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:33,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 19:36:33,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 19:36:33,957 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 19:36:34,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:34,145 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 19:36:34,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 19:36:34,146 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 19:36:34,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:34,147 INFO L225 Difference]: With dead ends: 60 [2020-08-18 19:36:34,147 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 19:36:34,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-18 19:36:34,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 19:36:34,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 19:36:34,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 19:36:34,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 19:36:34,154 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 19:36:34,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:34,154 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 19:36:34,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 19:36:34,154 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 19:36:34,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 19:36:34,155 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:34,155 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:34,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 19:36:34,156 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:34,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:34,157 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-18 19:36:34,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:34,157 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130762106] [2020-08-18 19:36:34,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:34,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:34,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:34,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:34,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:34,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:34,501 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:36:34,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130762106] [2020-08-18 19:36:34,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:34,502 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 19:36:34,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796181747] [2020-08-18 19:36:34,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 19:36:34,503 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:34,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 19:36:34,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 19:36:34,504 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 19:36:34,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:34,711 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 19:36:34,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 19:36:34,712 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 19:36:34,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:34,713 INFO L225 Difference]: With dead ends: 62 [2020-08-18 19:36:34,713 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 19:36:34,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-18 19:36:34,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 19:36:34,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 19:36:34,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 19:36:34,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 19:36:34,725 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 19:36:34,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:34,728 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 19:36:34,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 19:36:34,728 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 19:36:34,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 19:36:34,729 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:34,729 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:34,729 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 19:36:34,730 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:34,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:34,730 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-18 19:36:34,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:34,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [445724769] [2020-08-18 19:36:34,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:34,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:34,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:34,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:34,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:34,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:35,146 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:36:35,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [445724769] [2020-08-18 19:36:35,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:35,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 19:36:35,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357013380] [2020-08-18 19:36:35,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 19:36:35,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:35,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 19:36:35,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 19:36:35,150 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 19:36:35,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:35,383 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 19:36:35,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 19:36:35,384 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 19:36:35,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:35,385 INFO L225 Difference]: With dead ends: 64 [2020-08-18 19:36:35,385 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 19:36:35,386 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-18 19:36:35,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 19:36:35,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 19:36:35,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 19:36:35,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 19:36:35,392 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 19:36:35,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:35,393 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 19:36:35,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 19:36:35,393 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 19:36:35,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 19:36:35,394 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:35,394 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:35,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 19:36:35,395 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:35,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:35,395 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-18 19:36:35,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:35,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1385465554] [2020-08-18 19:36:35,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:35,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:35,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:35,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:35,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:35,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:35,464 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 19:36:35,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1385465554] [2020-08-18 19:36:35,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:36:35,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 19:36:35,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989881432] [2020-08-18 19:36:35,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 19:36:35,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:35,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 19:36:35,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:36:35,467 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 19:36:35,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:35,554 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 19:36:35,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 19:36:35,554 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 19:36:35,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:35,564 INFO L225 Difference]: With dead ends: 65 [2020-08-18 19:36:35,564 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 19:36:35,565 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 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 19:36:35,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 19:36:35,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 19:36:35,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 19:36:35,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 19:36:35,581 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 19:36:35,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:35,582 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 19:36:35,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 19:36:35,582 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 19:36:35,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 19:36:35,583 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:35,583 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:35,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 19:36:35,583 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:35,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:35,584 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-18 19:36:35,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:35,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1449282593] [2020-08-18 19:36:35,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:35,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:35,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:35,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:35,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:35,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:35,658 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 19:36:35,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1449282593] [2020-08-18 19:36:35,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:35,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 19:36:35,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848720581] [2020-08-18 19:36:35,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 19:36:35,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:35,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 19:36:35,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:36:35,662 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 19:36:35,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:35,753 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 19:36:35,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 19:36:35,753 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 19:36:35,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:35,754 INFO L225 Difference]: With dead ends: 73 [2020-08-18 19:36:35,755 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 19:36:35,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 19:36:35,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 19:36:35,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 19:36:35,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 19:36:35,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 19:36:35,763 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 19:36:35,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:35,763 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 19:36:35,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 19:36:35,764 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 19:36:35,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 19:36:35,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:35,765 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:35,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 19:36:35,765 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:35,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:35,765 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-18 19:36:35,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:35,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [614174554] [2020-08-18 19:36:35,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:35,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:35,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:35,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:35,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:35,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:35,828 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-18 19:36:35,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [614174554] [2020-08-18 19:36:35,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:36:35,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 19:36:35,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782742895] [2020-08-18 19:36:35,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 19:36:35,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:35,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 19:36:35,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:36:35,830 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 19:36:35,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:35,904 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 19:36:35,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 19:36:35,904 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 19:36:35,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:35,905 INFO L225 Difference]: With dead ends: 69 [2020-08-18 19:36:35,905 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 19:36:35,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 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 19:36:35,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 19:36:35,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 19:36:35,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 19:36:35,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 19:36:35,917 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 19:36:35,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:35,919 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 19:36:35,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 19:36:35,919 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 19:36:35,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 19:36:35,920 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:35,920 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:35,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 19:36:35,920 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:35,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:35,921 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-18 19:36:35,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:35,921 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [345339646] [2020-08-18 19:36:35,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:35,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:35,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:35,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:36,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:36,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:36,437 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:36,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [345339646] [2020-08-18 19:36:36,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:36,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 19:36:36,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396862532] [2020-08-18 19:36:36,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 19:36:36,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:36,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 19:36:36,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 19:36:36,439 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 19:36:36,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:36,650 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 19:36:36,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 19:36:36,650 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 19:36:36,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:36,651 INFO L225 Difference]: With dead ends: 74 [2020-08-18 19:36:36,651 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 19:36:36,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-18 19:36:36,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 19:36:36,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 19:36:36,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 19:36:36,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 19:36:36,658 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 19:36:36,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:36,658 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 19:36:36,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 19:36:36,659 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 19:36:36,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 19:36:36,659 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:36,660 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:36,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 19:36:36,660 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:36,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:36,661 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-18 19:36:36,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:36,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401604487] [2020-08-18 19:36:36,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:36,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:36,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:36,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:36,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:36,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:37,194 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:37,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401604487] [2020-08-18 19:36:37,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:37,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 19:36:37,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771556169] [2020-08-18 19:36:37,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 19:36:37,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:37,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 19:36:37,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 19:36:37,197 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 19:36:37,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:37,424 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 19:36:37,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 19:36:37,424 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 19:36:37,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:37,425 INFO L225 Difference]: With dead ends: 76 [2020-08-18 19:36:37,425 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 19:36:37,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-18 19:36:37,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 19:36:37,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 19:36:37,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 19:36:37,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 19:36:37,431 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 19:36:37,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:37,432 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 19:36:37,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 19:36:37,432 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 19:36:37,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 19:36:37,433 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:37,433 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:37,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 19:36:37,433 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:37,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:37,434 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-18 19:36:37,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:37,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786563781] [2020-08-18 19:36:37,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:37,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:37,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:37,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:37,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:37,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:38,038 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:38,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786563781] [2020-08-18 19:36:38,041 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:38,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 19:36:38,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364486315] [2020-08-18 19:36:38,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 19:36:38,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:38,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 19:36:38,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 19:36:38,043 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 19:36:38,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:38,314 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 19:36:38,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 19:36:38,315 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 19:36:38,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:38,316 INFO L225 Difference]: With dead ends: 78 [2020-08-18 19:36:38,316 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 19:36:38,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-18 19:36:38,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 19:36:38,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 19:36:38,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 19:36:38,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 19:36:38,322 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 19:36:38,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:38,322 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 19:36:38,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 19:36:38,322 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 19:36:38,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 19:36:38,323 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:38,323 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:38,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 19:36:38,324 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:38,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:38,324 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-18 19:36:38,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:38,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257453531] [2020-08-18 19:36:38,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:38,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:38,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:38,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:38,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:38,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:38,885 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:38,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257453531] [2020-08-18 19:36:38,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:38,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 19:36:38,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926286043] [2020-08-18 19:36:38,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 19:36:38,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:38,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 19:36:38,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 19:36:38,887 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 19:36:39,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:39,155 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 19:36:39,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 19:36:39,156 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 19:36:39,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:39,157 INFO L225 Difference]: With dead ends: 80 [2020-08-18 19:36:39,157 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 19:36:39,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-18 19:36:39,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 19:36:39,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 19:36:39,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 19:36:39,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 19:36:39,164 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 19:36:39,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:39,164 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 19:36:39,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 19:36:39,165 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 19:36:39,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 19:36:39,165 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:39,166 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:39,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 19:36:39,166 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:39,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:39,166 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-18 19:36:39,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:39,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1082935437] [2020-08-18 19:36:39,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:39,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:39,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:39,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:39,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:39,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:39,827 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:39,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1082935437] [2020-08-18 19:36:39,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:39,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 19:36:39,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130924179] [2020-08-18 19:36:39,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 19:36:39,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:39,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 19:36:39,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 19:36:39,829 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 19:36:40,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:40,087 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 19:36:40,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 19:36:40,088 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 19:36:40,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:40,089 INFO L225 Difference]: With dead ends: 82 [2020-08-18 19:36:40,089 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 19:36:40,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 19:36:40,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 19:36:40,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 19:36:40,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 19:36:40,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 19:36:40,095 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 19:36:40,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:40,096 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 19:36:40,096 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 19:36:40,096 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 19:36:40,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 19:36:40,097 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:40,097 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:40,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 19:36:40,097 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:40,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:40,098 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-18 19:36:40,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:40,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891897619] [2020-08-18 19:36:40,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:40,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:40,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:40,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:40,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:40,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:40,753 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:40,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891897619] [2020-08-18 19:36:40,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:40,754 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 19:36:40,754 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852762212] [2020-08-18 19:36:40,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 19:36:40,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:40,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 19:36:40,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 19:36:40,755 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 19:36:41,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:41,057 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 19:36:41,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 19:36:41,066 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 19:36:41,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:41,067 INFO L225 Difference]: With dead ends: 84 [2020-08-18 19:36:41,067 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 19:36:41,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-18 19:36:41,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 19:36:41,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 19:36:41,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 19:36:41,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 19:36:41,072 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 19:36:41,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:41,073 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 19:36:41,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 19:36:41,073 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 19:36:41,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 19:36:41,074 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:41,074 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:41,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 19:36:41,074 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:41,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:41,075 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-18 19:36:41,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:41,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914215086] [2020-08-18 19:36:41,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:41,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:41,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:41,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:41,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:41,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:41,798 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:41,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914215086] [2020-08-18 19:36:41,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:41,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 19:36:41,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010194743] [2020-08-18 19:36:41,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 19:36:41,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:41,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 19:36:41,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 19:36:41,800 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 19:36:42,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:42,029 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 19:36:42,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 19:36:42,030 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 19:36:42,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:42,031 INFO L225 Difference]: With dead ends: 86 [2020-08-18 19:36:42,031 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 19:36:42,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-18 19:36:42,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 19:36:42,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 19:36:42,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 19:36:42,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 19:36:42,039 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 19:36:42,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:42,039 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 19:36:42,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 19:36:42,040 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 19:36:42,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 19:36:42,041 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:42,041 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:42,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 19:36:42,041 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:42,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:42,042 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-18 19:36:42,042 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:42,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1577398862] [2020-08-18 19:36:42,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:42,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:42,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:42,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:42,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:42,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:43,119 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:43,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1577398862] [2020-08-18 19:36:43,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:43,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 19:36:43,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948417772] [2020-08-18 19:36:43,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 19:36:43,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:43,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 19:36:43,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 19:36:43,126 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 19:36:43,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:43,428 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 19:36:43,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 19:36:43,429 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 19:36:43,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:43,430 INFO L225 Difference]: With dead ends: 88 [2020-08-18 19:36:43,430 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 19:36:43,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-18 19:36:43,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 19:36:43,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 19:36:43,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 19:36:43,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 19:36:43,435 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 19:36:43,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:43,436 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 19:36:43,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 19:36:43,436 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 19:36:43,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 19:36:43,437 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:43,437 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:43,437 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 19:36:43,437 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:43,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:43,438 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-18 19:36:43,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:43,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [222247175] [2020-08-18 19:36:43,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:43,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:43,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:43,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:43,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:43,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:44,307 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:44,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [222247175] [2020-08-18 19:36:44,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:44,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 19:36:44,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506852282] [2020-08-18 19:36:44,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 19:36:44,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:44,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 19:36:44,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 19:36:44,310 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 19:36:44,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:44,620 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 19:36:44,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 19:36:44,623 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 19:36:44,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:44,624 INFO L225 Difference]: With dead ends: 90 [2020-08-18 19:36:44,624 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 19:36:44,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 19:36:44,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 19:36:44,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 19:36:44,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 19:36:44,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 19:36:44,629 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 19:36:44,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:44,630 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 19:36:44,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 19:36:44,630 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 19:36:44,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 19:36:44,631 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:44,631 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:44,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 19:36:44,631 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:44,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:44,631 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-18 19:36:44,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:44,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571870981] [2020-08-18 19:36:44,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:44,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:44,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:44,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:44,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:44,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:45,504 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:45,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571870981] [2020-08-18 19:36:45,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:45,505 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 19:36:45,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796353229] [2020-08-18 19:36:45,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 19:36:45,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:45,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 19:36:45,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 19:36:45,507 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 19:36:45,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:45,789 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 19:36:45,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 19:36:45,790 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 19:36:45,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:45,791 INFO L225 Difference]: With dead ends: 92 [2020-08-18 19:36:45,791 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 19:36:45,792 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-18 19:36:45,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 19:36:45,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 19:36:45,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 19:36:45,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 19:36:45,797 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 19:36:45,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:45,798 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 19:36:45,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 19:36:45,798 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 19:36:45,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 19:36:45,798 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:45,799 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:45,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 19:36:45,799 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:45,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:45,799 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-18 19:36:45,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:45,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104609291] [2020-08-18 19:36:45,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:45,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:45,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:45,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:45,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:45,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:46,801 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:46,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104609291] [2020-08-18 19:36:46,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:46,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 19:36:46,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569953023] [2020-08-18 19:36:46,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 19:36:46,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:46,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 19:36:46,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 19:36:46,804 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 19:36:47,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:47,132 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 19:36:47,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 19:36:47,133 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 19:36:47,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:47,134 INFO L225 Difference]: With dead ends: 94 [2020-08-18 19:36:47,134 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 19:36:47,135 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 19:36:47,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 19:36:47,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 19:36:47,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 19:36:47,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 19:36:47,142 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 19:36:47,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:47,142 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 19:36:47,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 19:36:47,142 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 19:36:47,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 19:36:47,143 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:47,143 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:47,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 19:36:47,145 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:47,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:47,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-18 19:36:47,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:47,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1590511538] [2020-08-18 19:36:47,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:47,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:47,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:47,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:47,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:47,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:48,492 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:48,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1590511538] [2020-08-18 19:36:48,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:48,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 19:36:48,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626055929] [2020-08-18 19:36:48,493 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 19:36:48,493 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:48,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 19:36:48,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 19:36:48,494 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 19:36:48,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:48,851 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 19:36:48,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 19:36:48,851 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 19:36:48,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:48,852 INFO L225 Difference]: With dead ends: 96 [2020-08-18 19:36:48,852 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 19:36:48,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-18 19:36:48,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 19:36:48,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 19:36:48,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 19:36:48,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 19:36:48,857 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 19:36:48,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:48,857 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 19:36:48,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 19:36:48,857 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 19:36:48,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 19:36:48,858 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:48,858 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:48,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 19:36:48,859 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:48,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:48,859 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-18 19:36:48,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:48,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931525057] [2020-08-18 19:36:48,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:48,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:48,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:48,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:48,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:48,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:49,966 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:49,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931525057] [2020-08-18 19:36:49,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:49,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 19:36:49,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956484037] [2020-08-18 19:36:49,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 19:36:49,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:49,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 19:36:49,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 19:36:49,968 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 19:36:50,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:50,207 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 19:36:50,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 19:36:50,207 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 19:36:50,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:50,209 INFO L225 Difference]: With dead ends: 98 [2020-08-18 19:36:50,209 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 19:36:50,210 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-18 19:36:50,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 19:36:50,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 19:36:50,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 19:36:50,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 19:36:50,215 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 19:36:50,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:50,215 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 19:36:50,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 19:36:50,215 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 19:36:50,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 19:36:50,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:50,216 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:50,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 19:36:50,217 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:50,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:50,217 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-18 19:36:50,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:50,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [839452124] [2020-08-18 19:36:50,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:50,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:50,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:50,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:50,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:50,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:51,349 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:51,350 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [839452124] [2020-08-18 19:36:51,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:51,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 19:36:51,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107316329] [2020-08-18 19:36:51,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 19:36:51,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:51,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 19:36:51,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 19:36:51,352 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 19:36:51,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:51,684 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 19:36:51,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 19:36:51,684 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 19:36:51,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:51,685 INFO L225 Difference]: With dead ends: 100 [2020-08-18 19:36:51,686 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 19:36:51,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-18 19:36:51,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 19:36:51,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 19:36:51,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 19:36:51,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 19:36:51,691 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 19:36:51,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:51,692 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 19:36:51,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 19:36:51,692 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 19:36:51,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 19:36:51,692 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:51,693 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:51,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 19:36:51,693 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:51,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:51,693 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-18 19:36:51,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:51,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241332461] [2020-08-18 19:36:51,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:51,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:51,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:51,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:51,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:51,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:52,925 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:52,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241332461] [2020-08-18 19:36:52,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:52,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 19:36:52,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814147933] [2020-08-18 19:36:52,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 19:36:52,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:52,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 19:36:52,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 19:36:52,927 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 19:36:53,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:53,362 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 19:36:53,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 19:36:53,362 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 19:36:53,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:53,363 INFO L225 Difference]: With dead ends: 102 [2020-08-18 19:36:53,363 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 19:36:53,364 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 19:36:53,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 19:36:53,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 19:36:53,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 19:36:53,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 19:36:53,368 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 19:36:53,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:53,368 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 19:36:53,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 19:36:53,369 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 19:36:53,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 19:36:53,369 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:53,370 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:53,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 19:36:53,370 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:53,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:53,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-18 19:36:53,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:53,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [212622428] [2020-08-18 19:36:53,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:53,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:53,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:53,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:53,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:53,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:54,695 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:54,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [212622428] [2020-08-18 19:36:54,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:54,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 19:36:54,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782137722] [2020-08-18 19:36:54,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 19:36:54,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:54,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 19:36:54,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 19:36:54,697 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 19:36:54,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:54,998 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 19:36:54,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 19:36:54,998 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 19:36:54,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:54,999 INFO L225 Difference]: With dead ends: 104 [2020-08-18 19:36:55,000 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 19:36:55,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 19:36:55,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 19:36:55,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 19:36:55,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 19:36:55,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 19:36:55,006 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 19:36:55,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:55,006 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 19:36:55,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 19:36:55,006 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 19:36:55,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 19:36:55,007 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:55,007 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:55,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 19:36:55,007 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:55,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:55,007 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-18 19:36:55,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:55,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470626687] [2020-08-18 19:36:55,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:55,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:55,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:55,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:55,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:55,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:56,380 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:56,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470626687] [2020-08-18 19:36:56,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:56,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 19:36:56,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124921768] [2020-08-18 19:36:56,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 19:36:56,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:56,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 19:36:56,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 19:36:56,382 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 19:36:56,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:56,772 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 19:36:56,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 19:36:56,772 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 19:36:56,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:56,773 INFO L225 Difference]: With dead ends: 106 [2020-08-18 19:36:56,773 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 19:36:56,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 19:36:56,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 19:36:56,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 19:36:56,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 19:36:56,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 19:36:56,778 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 19:36:56,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:56,778 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 19:36:56,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 19:36:56,778 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 19:36:56,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 19:36:56,779 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:56,779 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:56,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 19:36:56,780 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:56,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:56,780 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-18 19:36:56,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:56,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554365869] [2020-08-18 19:36:56,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:56,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:56,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:56,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:56,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:56,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:58,218 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:36:58,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554365869] [2020-08-18 19:36:58,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:36:58,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 19:36:58,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132263808] [2020-08-18 19:36:58,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 19:36:58,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:36:58,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 19:36:58,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 19:36:58,220 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 19:36:58,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:36:58,692 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 19:36:58,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 19:36:58,698 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 19:36:58,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:36:58,699 INFO L225 Difference]: With dead ends: 108 [2020-08-18 19:36:58,699 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 19:36:58,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 19:36:58,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 19:36:58,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 19:36:58,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 19:36:58,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 19:36:58,704 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 19:36:58,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:36:58,705 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 19:36:58,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 19:36:58,705 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 19:36:58,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 19:36:58,706 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:36:58,706 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:36:58,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 19:36:58,706 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:36:58,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:36:58,707 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-18 19:36:58,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:36:58,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1373138113] [2020-08-18 19:36:58,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:36:58,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:58,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:36:58,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:36:58,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:36:58,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:00,246 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:37:00,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1373138113] [2020-08-18 19:37:00,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:00,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 19:37:00,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553127761] [2020-08-18 19:37:00,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 19:37:00,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:00,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 19:37:00,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 19:37:00,249 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 19:37:00,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:00,708 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 19:37:00,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 19:37:00,708 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 19:37:00,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:00,710 INFO L225 Difference]: With dead ends: 110 [2020-08-18 19:37:00,710 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 19:37:00,711 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 19:37:00,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 19:37:00,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 19:37:00,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 19:37:00,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 19:37:00,716 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 19:37:00,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:00,717 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 19:37:00,717 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 19:37:00,717 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 19:37:00,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 19:37:00,720 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:00,720 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:00,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 19:37:00,720 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:00,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:00,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-18 19:37:00,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:00,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167432059] [2020-08-18 19:37:00,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:00,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:00,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:00,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:00,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:37:00,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:02,322 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:37:02,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167432059] [2020-08-18 19:37:02,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:02,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 19:37:02,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216697284] [2020-08-18 19:37:02,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 19:37:02,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:02,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 19:37:02,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 19:37:02,324 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 19:37:02,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:02,808 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 19:37:02,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 19:37:02,808 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 19:37:02,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:02,809 INFO L225 Difference]: With dead ends: 112 [2020-08-18 19:37:02,809 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 19:37:02,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 19:37:02,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 19:37:02,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 19:37:02,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 19:37:02,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 19:37:02,816 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 19:37:02,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:02,816 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 19:37:02,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 19:37:02,817 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 19:37:02,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 19:37:02,817 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:02,817 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:02,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 19:37:02,818 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:02,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:02,818 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-18 19:37:02,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:02,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519575996] [2020-08-18 19:37:02,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:02,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:02,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:02,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:02,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:37:02,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:04,604 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:37:04,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [519575996] [2020-08-18 19:37:04,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:04,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 19:37:04,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749439320] [2020-08-18 19:37:04,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 19:37:04,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:04,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 19:37:04,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 19:37:04,606 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 19:37:05,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:05,054 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 19:37:05,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 19:37:05,054 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 19:37:05,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:05,055 INFO L225 Difference]: With dead ends: 114 [2020-08-18 19:37:05,056 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 19:37:05,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 19:37:05,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 19:37:05,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 19:37:05,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 19:37:05,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 19:37:05,062 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 19:37:05,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:05,062 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 19:37:05,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 19:37:05,062 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 19:37:05,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 19:37:05,063 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:05,063 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:05,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 19:37:05,064 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:05,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:05,064 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-18 19:37:05,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:05,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1372060018] [2020-08-18 19:37:05,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:05,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:05,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:05,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:05,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:37:05,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:06,942 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:37:06,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1372060018] [2020-08-18 19:37:06,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:06,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 19:37:06,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358976301] [2020-08-18 19:37:06,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 19:37:06,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:06,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 19:37:06,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 19:37:06,945 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 19:37:07,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:07,308 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 19:37:07,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 19:37:07,309 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 19:37:07,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:07,310 INFO L225 Difference]: With dead ends: 116 [2020-08-18 19:37:07,311 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 19:37:07,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 19:37:07,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 19:37:07,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 19:37:07,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 19:37:07,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 19:37:07,317 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 19:37:07,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:07,317 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 19:37:07,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 19:37:07,318 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 19:37:07,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 19:37:07,318 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:07,318 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:07,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 19:37:07,319 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:07,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:07,319 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-18 19:37:07,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:07,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [617705926] [2020-08-18 19:37:07,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:07,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:07,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:07,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:07,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:37:07,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:09,282 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:37:09,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [617705926] [2020-08-18 19:37:09,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:09,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 19:37:09,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165530601] [2020-08-18 19:37:09,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 19:37:09,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:09,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 19:37:09,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 19:37:09,284 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 19:37:09,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:09,796 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 19:37:09,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 19:37:09,797 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 19:37:09,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:09,798 INFO L225 Difference]: With dead ends: 118 [2020-08-18 19:37:09,799 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 19:37:09,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 19:37:09,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 19:37:09,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 19:37:09,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 19:37:09,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 19:37:09,805 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 19:37:09,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:09,805 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 19:37:09,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 19:37:09,805 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 19:37:09,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 19:37:09,806 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:09,806 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:09,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 19:37:09,806 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:09,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:09,807 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-18 19:37:09,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:09,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250383226] [2020-08-18 19:37:09,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:09,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:09,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:09,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:09,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:37:09,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:11,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:37:11,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250383226] [2020-08-18 19:37:11,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:11,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 19:37:11,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160781876] [2020-08-18 19:37:11,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 19:37:11,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:11,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 19:37:11,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 19:37:11,789 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 19:37:12,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:12,224 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 19:37:12,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 19:37:12,225 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 19:37:12,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:12,226 INFO L225 Difference]: With dead ends: 120 [2020-08-18 19:37:12,226 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 19:37:12,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 19:37:12,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 19:37:12,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 19:37:12,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 19:37:12,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 19:37:12,234 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 19:37:12,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:12,234 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 19:37:12,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 19:37:12,234 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 19:37:12,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 19:37:12,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:12,235 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:12,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 19:37:12,235 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:12,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:12,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-18 19:37:12,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:12,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517803390] [2020-08-18 19:37:12,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:12,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:12,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:12,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:12,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:37:12,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:14,339 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:37:14,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517803390] [2020-08-18 19:37:14,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:14,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 19:37:14,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551183825] [2020-08-18 19:37:14,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 19:37:14,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:14,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 19:37:14,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 19:37:14,342 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 19:37:14,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:14,692 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 19:37:14,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 19:37:14,693 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 19:37:14,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:14,694 INFO L225 Difference]: With dead ends: 122 [2020-08-18 19:37:14,694 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 19:37:14,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 19:37:14,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 19:37:14,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 19:37:14,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 19:37:14,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 19:37:14,699 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 19:37:14,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:14,699 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 19:37:14,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 19:37:14,699 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 19:37:14,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 19:37:14,700 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:14,700 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:14,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 19:37:14,700 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:14,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:14,701 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-18 19:37:14,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:14,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200120517] [2020-08-18 19:37:14,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:14,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:14,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:14,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:14,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:37:14,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:16,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:37:16,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200120517] [2020-08-18 19:37:16,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:16,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 19:37:16,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955421671] [2020-08-18 19:37:16,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 19:37:16,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:16,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 19:37:16,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 19:37:16,893 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 19:37:17,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:17,218 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 19:37:17,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 19:37:17,218 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 19:37:17,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:17,220 INFO L225 Difference]: With dead ends: 124 [2020-08-18 19:37:17,220 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 19:37:17,222 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 19:37:17,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 19:37:17,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 19:37:17,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 19:37:17,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 19:37:17,227 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 19:37:17,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:17,227 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 19:37:17,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 19:37:17,228 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 19:37:17,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 19:37:17,228 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:17,228 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:17,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 19:37:17,229 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:17,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:17,229 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-18 19:37:17,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:17,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707893212] [2020-08-18 19:37:17,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:17,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:17,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:17,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:17,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:37:17,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:19,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:37:19,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707893212] [2020-08-18 19:37:19,501 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:19,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 19:37:19,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913996714] [2020-08-18 19:37:19,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 19:37:19,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:19,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 19:37:19,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 19:37:19,502 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 19:37:19,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:19,862 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 19:37:19,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 19:37:19,863 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 19:37:19,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:19,864 INFO L225 Difference]: With dead ends: 126 [2020-08-18 19:37:19,864 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 19:37:19,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 19:37:19,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 19:37:19,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 19:37:19,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 19:37:19,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 19:37:19,870 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 19:37:19,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:19,870 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 19:37:19,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 19:37:19,870 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 19:37:19,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 19:37:19,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:19,871 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:19,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 19:37:19,871 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:19,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:19,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-18 19:37:19,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:19,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523321056] [2020-08-18 19:37:19,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:19,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:19,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:19,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:19,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:37:19,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:22,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:37:22,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523321056] [2020-08-18 19:37:22,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:22,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 19:37:22,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811261625] [2020-08-18 19:37:22,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 19:37:22,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:22,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 19:37:22,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 19:37:22,275 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 19:37:22,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:22,720 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 19:37:22,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 19:37:22,721 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 19:37:22,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:22,722 INFO L225 Difference]: With dead ends: 128 [2020-08-18 19:37:22,722 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 19:37:22,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 19:37:22,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 19:37:22,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 19:37:22,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 19:37:22,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 19:37:22,728 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 19:37:22,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:22,729 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 19:37:22,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 19:37:22,729 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 19:37:22,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 19:37:22,729 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:22,729 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:22,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 19:37:22,730 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:22,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:22,730 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-18 19:37:22,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:22,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498873813] [2020-08-18 19:37:22,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:22,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:22,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:22,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:22,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:37:22,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 19:37:25,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498873813] [2020-08-18 19:37:25,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:25,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 19:37:25,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786552279] [2020-08-18 19:37:25,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 19:37:25,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:25,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 19:37:25,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 19:37:25,236 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-18 19:37:25,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,828 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-18 19:37:25,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 19:37:25,828 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-18 19:37:25,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,829 INFO L225 Difference]: With dead ends: 130 [2020-08-18 19:37:25,830 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 19:37:25,831 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 19:37:25,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 19:37:25,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 19:37:25,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 19:37:25,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-18 19:37:25,836 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-18 19:37:25,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,836 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-18 19:37:25,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 19:37:25,836 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-18 19:37:25,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 19:37:25,837 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,837 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 19:37:25,837 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-18 19:37:25,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493153816] [2020-08-18 19:37:25,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:25,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:25,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 19:37:25,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat