/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:50:19,893 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 15:50:19,896 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 15:50:19,939 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-21 15:50:20,020 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 15:50:20,057 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:50:20,060 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:50:20,062 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:50:20,062 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:50:20,063 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:50:20,063 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:50:20,063 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:50:20,064 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:50:20,064 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:50:20,064 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:50:20,065 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:50:20,065 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:50:20,065 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:50:20,066 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:50:20,067 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:50:20,067 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:50:20,067 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:50:20,068 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:50:20,068 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:50:20,068 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:50:20,069 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:50:20,069 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:50:20,069 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:50:20,069 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:50:20,069 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:50:20,070 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:50:20,070 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:50:20,070 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:50:20,070 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:50:20,070 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 15:50:20,351 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:50:20,364 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:50:20,368 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:50:20,369 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:50:20,370 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:50:20,371 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 15:50:20,450 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3ba74f52d/76213aa7df58401b9323c866748d618e/FLAGcc1ce3c1b [2020-08-21 15:50:20,899 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:50:20,900 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 15:50:20,906 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3ba74f52d/76213aa7df58401b9323c866748d618e/FLAGcc1ce3c1b [2020-08-21 15:50:21,283 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/3ba74f52d/76213aa7df58401b9323c866748d618e [2020-08-21 15:50:21,293 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:50:21,295 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:50:21,298 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:50:21,299 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:50:21,302 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:50:21,303 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:50:21" (1/1) ... [2020-08-21 15:50:21,307 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45241865 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:21, skipping insertion in model container [2020-08-21 15:50:21,307 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:50:21" (1/1) ... [2020-08-21 15:50:21,316 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:50:21,335 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:50:21,549 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:50:21,555 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:50:21,570 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:50:21,584 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:50:21,584 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:21 WrapperNode [2020-08-21 15:50:21,584 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:50:21,585 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:50:21,585 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:50:21,585 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:50:21,685 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:21" (1/1) ... [2020-08-21 15:50:21,685 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:21" (1/1) ... [2020-08-21 15:50:21,693 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:21" (1/1) ... [2020-08-21 15:50:21,694 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:21" (1/1) ... [2020-08-21 15:50:21,708 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:21" (1/1) ... [2020-08-21 15:50:21,713 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:21" (1/1) ... [2020-08-21 15:50:21,715 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:21" (1/1) ... [2020-08-21 15:50:21,717 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:50:21,718 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:50:21,718 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:50:21,718 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:50:21,719 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:21" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:50:21,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:50:21,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:50:21,782 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 15:50:21,782 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 15:50:21,782 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:50:21,782 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 15:50:21,783 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:50:21,783 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 15:50:21,783 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 15:50:21,784 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 15:50:21,784 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 15:50:21,784 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:50:21,784 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 15:50:21,784 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 15:50:21,784 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 15:50:21,785 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:50:21,785 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:50:22,057 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:50:22,057 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 15:50:22,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:50:22 BoogieIcfgContainer [2020-08-21 15:50:22,061 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:50:22,063 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:50:22,063 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:50:22,067 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:50:22,067 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:50:21" (1/3) ... [2020-08-21 15:50:22,068 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10e9073f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:50:22, skipping insertion in model container [2020-08-21 15:50:22,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:21" (2/3) ... [2020-08-21 15:50:22,069 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10e9073f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:50:22, skipping insertion in model container [2020-08-21 15:50:22,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:50:22" (3/3) ... [2020-08-21 15:50:22,072 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-21 15:50:22,086 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:50:22,093 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:50:22,109 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:50:22,137 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:50:22,137 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:50:22,138 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:50:22,138 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:50:22,138 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:50:22,138 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:50:22,138 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:50:22,138 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:50:22,159 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 15:50:22,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 15:50:22,166 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:22,167 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] [2020-08-21 15:50:22,167 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:22,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:22,174 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-21 15:50:22,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:22,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [503219717] [2020-08-21 15:50:22,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:22,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:22,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:22,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:22,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:22,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:22,415 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:22,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [503219717] [2020-08-21 15:50:22,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:22,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:50:22,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069454056] [2020-08-21 15:50:22,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:50:22,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:22,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:50:22,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:50:22,441 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 15:50:22,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:22,591 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 15:50:22,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 15:50:22,593 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 15:50:22,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:22,605 INFO L225 Difference]: With dead ends: 59 [2020-08-21 15:50:22,605 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 15:50:22,609 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 [2020-08-21 15:50:22,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 15:50:22,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 15:50:22,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 15:50:22,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 15:50:22,656 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 15:50:22,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:22,657 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 15:50:22,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:50:22,657 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 15:50:22,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 15:50:22,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:22,658 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] [2020-08-21 15:50:22,659 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:50:22,659 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:22,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:22,660 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-21 15:50:22,660 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:22,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142717562] [2020-08-21 15:50:22,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:22,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:22,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:22,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:22,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:22,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:22,903 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:22,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142717562] [2020-08-21 15:50:22,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:22,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 15:50:22,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460387894] [2020-08-21 15:50:22,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:50:22,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:22,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:50:22,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:50:22,907 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 15:50:23,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:23,087 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 15:50:23,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:50:23,088 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 15:50:23,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:23,089 INFO L225 Difference]: With dead ends: 48 [2020-08-21 15:50:23,090 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 15:50:23,091 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 [2020-08-21 15:50:23,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 15:50:23,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 15:50:23,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 15:50:23,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 15:50:23,100 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 15:50:23,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:23,101 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 15:50:23,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:50:23,101 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 15:50:23,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 15:50:23,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:23,102 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] [2020-08-21 15:50:23,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:50:23,103 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:23,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:23,103 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-21 15:50:23,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:23,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12658153] [2020-08-21 15:50:23,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:23,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:23,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:23,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:23,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:23,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:23,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:23,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12658153] [2020-08-21 15:50:23,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:23,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:50:23,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249129647] [2020-08-21 15:50:23,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:50:23,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:23,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:50:23,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:50:23,334 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 15:50:23,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:23,494 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 15:50:23,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:50:23,495 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 15:50:23,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:23,496 INFO L225 Difference]: With dead ends: 50 [2020-08-21 15:50:23,496 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 15:50:23,497 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 [2020-08-21 15:50:23,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 15:50:23,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 15:50:23,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 15:50:23,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 15:50:23,504 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 15:50:23,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:23,505 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 15:50:23,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:50:23,505 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 15:50:23,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 15:50:23,506 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:23,506 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] [2020-08-21 15:50:23,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:50:23,507 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:23,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:23,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-21 15:50:23,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:23,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334069826] [2020-08-21 15:50:23,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:23,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:23,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:23,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:23,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:23,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:23,744 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:23,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334069826] [2020-08-21 15:50:23,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:23,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 15:50:23,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760275021] [2020-08-21 15:50:23,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:50:23,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:23,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:50:23,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:50:23,747 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 15:50:23,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:23,935 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 15:50:23,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 15:50:23,935 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 15:50:23,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:23,936 INFO L225 Difference]: With dead ends: 52 [2020-08-21 15:50:23,937 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 15:50:23,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:50:23,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 15:50:23,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 15:50:23,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 15:50:23,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 15:50:23,944 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 15:50:23,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:23,945 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 15:50:23,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:50:23,945 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 15:50:23,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 15:50:23,946 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:23,946 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] [2020-08-21 15:50:23,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 15:50:23,947 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:23,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:23,947 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-21 15:50:23,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:23,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [662393693] [2020-08-21 15:50:23,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:23,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:23,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:23,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:24,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,208 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:24,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [662393693] [2020-08-21 15:50:24,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:24,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 15:50:24,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572818300] [2020-08-21 15:50:24,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 15:50:24,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:24,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 15:50:24,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:50:24,213 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 15:50:24,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:24,412 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 15:50:24,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:50:24,412 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 15:50:24,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:24,413 INFO L225 Difference]: With dead ends: 54 [2020-08-21 15:50:24,414 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 15:50:24,417 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 [2020-08-21 15:50:24,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 15:50:24,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 15:50:24,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 15:50:24,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 15:50:24,431 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 15:50:24,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:24,433 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 15:50:24,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 15:50:24,433 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 15:50:24,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 15:50:24,434 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:24,434 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] [2020-08-21 15:50:24,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 15:50:24,435 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:24,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:24,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-21 15:50:24,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:24,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052990327] [2020-08-21 15:50:24,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:24,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:24,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:24,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,721 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:24,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052990327] [2020-08-21 15:50:24,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:24,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 15:50:24,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184050805] [2020-08-21 15:50:24,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 15:50:24,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:24,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 15:50:24,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:50:24,724 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 15:50:24,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:24,936 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 15:50:24,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 15:50:24,937 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 15:50:24,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:24,938 INFO L225 Difference]: With dead ends: 56 [2020-08-21 15:50:24,938 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 15:50:24,939 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 [2020-08-21 15:50:24,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 15:50:24,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 15:50:24,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 15:50:24,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 15:50:24,944 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 15:50:24,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:24,945 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 15:50:24,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 15:50:24,945 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 15:50:24,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 15:50:24,946 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:24,946 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] [2020-08-21 15:50:24,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 15:50:24,947 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:24,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:24,947 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-21 15:50:24,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:24,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [81845834] [2020-08-21 15:50:24,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:24,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:24,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:24,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:25,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:25,255 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:25,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [81845834] [2020-08-21 15:50:25,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:25,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:50:25,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911254121] [2020-08-21 15:50:25,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:50:25,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:25,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:50:25,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:50:25,257 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 15:50:25,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:25,474 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 15:50:25,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 15:50:25,475 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 15:50:25,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:25,476 INFO L225 Difference]: With dead ends: 58 [2020-08-21 15:50:25,476 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 15:50:25,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:50:25,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 15:50:25,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 15:50:25,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 15:50:25,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 15:50:25,490 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 15:50:25,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:25,492 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 15:50:25,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:50:25,493 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 15:50:25,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 15:50:25,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:25,494 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] [2020-08-21 15:50:25,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 15:50:25,494 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:25,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:25,495 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-21 15:50:25,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:25,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442472585] [2020-08-21 15:50:25,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:25,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:25,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:25,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:25,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:25,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:25,871 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:25,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442472585] [2020-08-21 15:50:25,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:25,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 15:50:25,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620072282] [2020-08-21 15:50:25,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 15:50:25,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:25,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 15:50:25,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:50:25,874 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 15:50:26,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:26,078 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 15:50:26,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 15:50:26,078 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 15:50:26,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:26,079 INFO L225 Difference]: With dead ends: 60 [2020-08-21 15:50:26,080 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 15:50:26,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:50:26,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 15:50:26,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 15:50:26,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 15:50:26,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 15:50:26,093 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 15:50:26,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:26,093 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 15:50:26,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 15:50:26,093 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 15:50:26,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 15:50:26,095 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:26,095 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] [2020-08-21 15:50:26,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 15:50:26,095 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:26,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:26,096 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-21 15:50:26,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:26,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1015493381] [2020-08-21 15:50:26,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:26,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:26,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:26,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,482 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:26,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1015493381] [2020-08-21 15:50:26,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:26,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 15:50:26,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095494603] [2020-08-21 15:50:26,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 15:50:26,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:26,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 15:50:26,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:50:26,488 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 15:50:26,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:26,698 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 15:50:26,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 15:50:26,699 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 15:50:26,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:26,700 INFO L225 Difference]: With dead ends: 62 [2020-08-21 15:50:26,700 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 15:50:26,700 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 [2020-08-21 15:50:26,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 15:50:26,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 15:50:26,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 15:50:26,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 15:50:26,712 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 15:50:26,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:26,712 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 15:50:26,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 15:50:26,713 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 15:50:26,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 15:50:26,715 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:26,715 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] [2020-08-21 15:50:26,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 15:50:26,715 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:26,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:26,716 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-21 15:50:26,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:26,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [483615534] [2020-08-21 15:50:26,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:26,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:26,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:26,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:26,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,121 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:27,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [483615534] [2020-08-21 15:50:27,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:27,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 15:50:27,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23471712] [2020-08-21 15:50:27,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 15:50:27,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:27,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 15:50:27,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:50:27,126 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 15:50:27,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:27,368 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 15:50:27,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 15:50:27,369 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 15:50:27,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:27,370 INFO L225 Difference]: With dead ends: 64 [2020-08-21 15:50:27,370 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 15:50:27,370 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 [2020-08-21 15:50:27,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 15:50:27,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 15:50:27,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 15:50:27,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 15:50:27,380 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 15:50:27,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:27,381 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 15:50:27,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 15:50:27,384 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 15:50:27,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 15:50:27,385 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:27,385 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] [2020-08-21 15:50:27,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 15:50:27,385 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:27,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:27,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-21 15:50:27,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:27,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1755842125] [2020-08-21 15:50:27,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:27,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:27,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:27,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,456 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 15:50:27,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1755842125] [2020-08-21 15:50:27,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:27,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:50:27,457 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481554731] [2020-08-21 15:50:27,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:50:27,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:27,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:50:27,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:50:27,459 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 15:50:27,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:27,533 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 15:50:27,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 15:50:27,534 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 15:50:27,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:27,536 INFO L225 Difference]: With dead ends: 65 [2020-08-21 15:50:27,536 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 15:50:27,537 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 [2020-08-21 15:50:27,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 15:50:27,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 15:50:27,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 15:50:27,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 15:50:27,547 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 15:50:27,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:27,547 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 15:50:27,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:50:27,547 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 15:50:27,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 15:50:27,548 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:27,548 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] [2020-08-21 15:50:27,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 15:50:27,549 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:27,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:27,549 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-21 15:50:27,549 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:27,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1134118801] [2020-08-21 15:50:27,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:27,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:27,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:27,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,643 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 15:50:27,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1134118801] [2020-08-21 15:50:27,644 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:27,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:50:27,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400927187] [2020-08-21 15:50:27,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:50:27,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:27,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:50:27,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:50:27,646 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 15:50:27,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:27,742 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 15:50:27,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:50:27,742 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 15:50:27,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:27,744 INFO L225 Difference]: With dead ends: 73 [2020-08-21 15:50:27,744 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 15:50:27,744 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 [2020-08-21 15:50:27,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 15:50:27,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 15:50:27,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 15:50:27,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 15:50:27,755 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 15:50:27,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:27,755 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 15:50:27,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:50:27,756 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 15:50:27,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 15:50:27,759 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:27,759 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] [2020-08-21 15:50:27,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 15:50:27,759 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:27,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:27,760 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-21 15:50:27,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:27,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1785702244] [2020-08-21 15:50:27,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:27,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:27,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:27,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:27,836 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-21 15:50:27,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1785702244] [2020-08-21 15:50:27,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:27,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:50:27,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500588594] [2020-08-21 15:50:27,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:50:27,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:27,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:50:27,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:50:27,840 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 15:50:27,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:27,922 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 15:50:27,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 15:50:27,923 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 15:50:27,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:27,926 INFO L225 Difference]: With dead ends: 69 [2020-08-21 15:50:27,926 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 15:50:27,927 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 [2020-08-21 15:50:27,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 15:50:27,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 15:50:27,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 15:50:27,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 15:50:27,943 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 15:50:27,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:27,944 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 15:50:27,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:50:27,944 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 15:50:27,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 15:50:27,945 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:27,945 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] [2020-08-21 15:50:27,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 15:50:27,946 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:27,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:27,947 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-21 15:50:27,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:27,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768352116] [2020-08-21 15:50:27,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:27,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:28,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:28,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,450 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:28,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768352116] [2020-08-21 15:50:28,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:28,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 15:50:28,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224586716] [2020-08-21 15:50:28,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 15:50:28,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:28,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 15:50:28,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:50:28,454 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 15:50:28,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:28,673 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 15:50:28,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 15:50:28,673 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 15:50:28,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:28,675 INFO L225 Difference]: With dead ends: 74 [2020-08-21 15:50:28,675 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 15:50:28,676 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 [2020-08-21 15:50:28,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 15:50:28,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 15:50:28,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 15:50:28,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 15:50:28,683 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 15:50:28,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:28,684 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 15:50:28,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 15:50:28,684 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 15:50:28,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 15:50:28,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:28,687 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] [2020-08-21 15:50:28,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 15:50:28,687 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:28,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:28,687 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-21 15:50:28,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:28,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442917489] [2020-08-21 15:50:28,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:28,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:28,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:28,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:28,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:29,183 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:29,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442917489] [2020-08-21 15:50:29,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:29,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 15:50:29,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574656401] [2020-08-21 15:50:29,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 15:50:29,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:29,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 15:50:29,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:50:29,185 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 15:50:29,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:29,433 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 15:50:29,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 15:50:29,433 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 15:50:29,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:29,434 INFO L225 Difference]: With dead ends: 76 [2020-08-21 15:50:29,434 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 15:50:29,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:50:29,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 15:50:29,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 15:50:29,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 15:50:29,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 15:50:29,456 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 15:50:29,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:29,456 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 15:50:29,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 15:50:29,456 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 15:50:29,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 15:50:29,457 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:29,457 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] [2020-08-21 15:50:29,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 15:50:29,457 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:29,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:29,458 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-21 15:50:29,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:29,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610854144] [2020-08-21 15:50:29,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:29,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:29,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:29,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:29,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:29,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:30,008 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:30,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610854144] [2020-08-21 15:50:30,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:30,012 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 15:50:30,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726847134] [2020-08-21 15:50:30,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 15:50:30,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:30,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 15:50:30,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:50:30,014 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 15:50:30,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:30,231 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 15:50:30,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 15:50:30,232 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 15:50:30,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:30,233 INFO L225 Difference]: With dead ends: 78 [2020-08-21 15:50:30,233 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 15:50:30,234 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-21 15:50:30,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 15:50:30,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 15:50:30,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 15:50:30,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 15:50:30,239 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 15:50:30,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:30,240 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 15:50:30,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 15:50:30,240 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 15:50:30,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 15:50:30,241 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:30,241 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] [2020-08-21 15:50:30,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 15:50:30,241 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:30,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:30,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-21 15:50:30,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:30,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595748037] [2020-08-21 15:50:30,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:30,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:30,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:30,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:30,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:30,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:30,961 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:30,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595748037] [2020-08-21 15:50:30,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:30,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 15:50:30,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345211199] [2020-08-21 15:50:30,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 15:50:30,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:30,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 15:50:30,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:50:30,964 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 15:50:31,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:31,298 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 15:50:31,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 15:50:31,298 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 15:50:31,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:31,300 INFO L225 Difference]: With dead ends: 80 [2020-08-21 15:50:31,300 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 15:50:31,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:50:31,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 15:50:31,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 15:50:31,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 15:50:31,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 15:50:31,316 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 15:50:31,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:31,316 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 15:50:31,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 15:50:31,317 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 15:50:31,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 15:50:31,318 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:31,318 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] [2020-08-21 15:50:31,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 15:50:31,319 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:31,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:31,320 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-21 15:50:31,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:31,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1668574100] [2020-08-21 15:50:31,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:31,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:31,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:31,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:31,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:31,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:31,925 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:31,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1668574100] [2020-08-21 15:50:31,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:31,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 15:50:31,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315501926] [2020-08-21 15:50:31,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 15:50:31,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:31,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 15:50:31,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:50:31,928 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 15:50:32,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:32,188 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 15:50:32,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 15:50:32,193 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 15:50:32,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:32,194 INFO L225 Difference]: With dead ends: 82 [2020-08-21 15:50:32,194 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 15:50:32,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:50:32,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 15:50:32,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 15:50:32,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 15:50:32,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 15:50:32,199 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 15:50:32,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:32,200 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 15:50:32,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 15:50:32,200 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 15:50:32,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 15:50:32,201 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:32,201 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] [2020-08-21 15:50:32,201 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 15:50:32,201 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:32,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:32,202 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-21 15:50:32,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:32,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [577310373] [2020-08-21 15:50:32,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:32,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:32,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:32,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:32,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:32,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:32,829 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:32,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [577310373] [2020-08-21 15:50:32,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:32,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 15:50:32,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418307324] [2020-08-21 15:50:32,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 15:50:32,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:32,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 15:50:32,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 15:50:32,832 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 15:50:33,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:33,118 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 15:50:33,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 15:50:33,118 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 15:50:33,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:33,119 INFO L225 Difference]: With dead ends: 84 [2020-08-21 15:50:33,119 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 15:50:33,120 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 [2020-08-21 15:50:33,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 15:50:33,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 15:50:33,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 15:50:33,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 15:50:33,124 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 15:50:33,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:33,125 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 15:50:33,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 15:50:33,125 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 15:50:33,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 15:50:33,126 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:33,126 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] [2020-08-21 15:50:33,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 15:50:33,126 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:33,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:33,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-21 15:50:33,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:33,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1383841274] [2020-08-21 15:50:33,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:33,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:33,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:33,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:33,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:33,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:33,917 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:33,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1383841274] [2020-08-21 15:50:33,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:33,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 15:50:33,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786351991] [2020-08-21 15:50:33,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 15:50:33,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:33,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 15:50:33,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:50:33,919 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 15:50:34,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:34,139 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 15:50:34,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 15:50:34,139 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 15:50:34,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:34,140 INFO L225 Difference]: With dead ends: 86 [2020-08-21 15:50:34,140 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 15:50:34,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:50:34,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 15:50:34,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 15:50:34,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 15:50:34,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 15:50:34,148 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 15:50:34,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:34,148 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 15:50:34,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 15:50:34,149 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 15:50:34,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 15:50:34,149 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:34,149 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] [2020-08-21 15:50:34,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 15:50:34,150 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:34,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:34,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-21 15:50:34,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:34,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [97751] [2020-08-21 15:50:34,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:34,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:34,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:34,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:34,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:34,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:34,955 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:34,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [97751] [2020-08-21 15:50:34,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:34,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 15:50:34,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681337414] [2020-08-21 15:50:34,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 15:50:34,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:34,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 15:50:34,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:50:34,958 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 15:50:35,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:35,266 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 15:50:35,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 15:50:35,267 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 15:50:35,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:35,268 INFO L225 Difference]: With dead ends: 88 [2020-08-21 15:50:35,268 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 15:50:35,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:50:35,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 15:50:35,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 15:50:35,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 15:50:35,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 15:50:35,274 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 15:50:35,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:35,274 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 15:50:35,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 15:50:35,274 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 15:50:35,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 15:50:35,275 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:35,275 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] [2020-08-21 15:50:35,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 15:50:35,276 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:35,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:35,276 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-21 15:50:35,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:35,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [539400910] [2020-08-21 15:50:35,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:35,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:35,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:35,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:35,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:35,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:36,132 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:36,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [539400910] [2020-08-21 15:50:36,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:36,133 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 15:50:36,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122216309] [2020-08-21 15:50:36,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 15:50:36,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:36,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 15:50:36,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 15:50:36,134 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 15:50:36,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:36,452 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 15:50:36,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 15:50:36,455 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 15:50:36,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:36,456 INFO L225 Difference]: With dead ends: 90 [2020-08-21 15:50:36,456 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 15:50:36,457 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 [2020-08-21 15:50:36,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 15:50:36,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 15:50:36,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 15:50:36,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 15:50:36,461 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 15:50:36,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:36,462 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 15:50:36,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 15:50:36,462 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 15:50:36,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 15:50:36,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:36,463 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] [2020-08-21 15:50:36,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 15:50:36,463 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:36,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:36,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-21 15:50:36,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:36,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [127234759] [2020-08-21 15:50:36,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:36,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:36,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:36,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:36,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:36,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:37,361 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:37,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [127234759] [2020-08-21 15:50:37,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:37,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 15:50:37,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477887576] [2020-08-21 15:50:37,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 15:50:37,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:37,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 15:50:37,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:50:37,363 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 15:50:37,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:37,667 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 15:50:37,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 15:50:37,668 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 15:50:37,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:37,669 INFO L225 Difference]: With dead ends: 92 [2020-08-21 15:50:37,669 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 15:50:37,670 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 [2020-08-21 15:50:37,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 15:50:37,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 15:50:37,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 15:50:37,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 15:50:37,674 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 15:50:37,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:37,675 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 15:50:37,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 15:50:37,675 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 15:50:37,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 15:50:37,676 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:37,676 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] [2020-08-21 15:50:37,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 15:50:37,676 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:37,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:37,677 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-21 15:50:37,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:37,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480640624] [2020-08-21 15:50:37,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:37,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:37,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:37,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:37,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:37,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:38,658 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:38,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480640624] [2020-08-21 15:50:38,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:38,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 15:50:38,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817874785] [2020-08-21 15:50:38,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 15:50:38,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:38,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 15:50:38,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:50:38,660 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 15:50:38,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:38,972 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 15:50:38,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 15:50:38,972 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 15:50:38,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:38,973 INFO L225 Difference]: With dead ends: 94 [2020-08-21 15:50:38,973 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 15:50:38,975 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 [2020-08-21 15:50:38,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 15:50:38,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 15:50:38,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 15:50:38,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 15:50:38,981 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 15:50:38,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:38,981 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 15:50:38,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 15:50:38,982 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 15:50:38,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 15:50:38,982 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:38,982 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] [2020-08-21 15:50:38,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 15:50:38,986 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:38,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:38,986 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-21 15:50:38,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:38,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [102597210] [2020-08-21 15:50:38,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:39,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:39,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:39,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:39,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:39,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:40,024 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:40,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [102597210] [2020-08-21 15:50:40,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:40,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 15:50:40,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029198396] [2020-08-21 15:50:40,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 15:50:40,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:40,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 15:50:40,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 15:50:40,026 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 15:50:40,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:40,386 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 15:50:40,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 15:50:40,386 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 15:50:40,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:40,387 INFO L225 Difference]: With dead ends: 96 [2020-08-21 15:50:40,387 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 15:50:40,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-21 15:50:40,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 15:50:40,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 15:50:40,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 15:50:40,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 15:50:40,392 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 15:50:40,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:40,392 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 15:50:40,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 15:50:40,393 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 15:50:40,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 15:50:40,393 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:40,393 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] [2020-08-21 15:50:40,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 15:50:40,394 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:40,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:40,394 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-21 15:50:40,394 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:40,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849359947] [2020-08-21 15:50:40,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:40,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:40,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:40,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:40,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:40,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:41,529 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:41,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849359947] [2020-08-21 15:50:41,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:41,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 15:50:41,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116988848] [2020-08-21 15:50:41,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 15:50:41,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:41,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 15:50:41,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 15:50:41,531 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 15:50:41,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:41,770 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 15:50:41,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 15:50:41,771 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 15:50:41,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:41,771 INFO L225 Difference]: With dead ends: 98 [2020-08-21 15:50:41,772 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 15:50:41,773 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 [2020-08-21 15:50:41,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 15:50:41,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 15:50:41,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 15:50:41,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 15:50:41,778 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 15:50:41,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:41,778 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 15:50:41,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 15:50:41,779 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 15:50:41,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 15:50:41,779 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:41,779 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] [2020-08-21 15:50:41,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 15:50:41,780 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:41,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:41,780 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-21 15:50:41,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:41,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [143743510] [2020-08-21 15:50:41,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:41,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:41,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:41,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:41,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:41,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:42,920 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:42,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [143743510] [2020-08-21 15:50:42,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:42,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 15:50:42,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145853448] [2020-08-21 15:50:42,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 15:50:42,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:42,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 15:50:42,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 15:50:42,922 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 15:50:43,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:43,265 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 15:50:43,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 15:50:43,266 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 15:50:43,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:43,267 INFO L225 Difference]: With dead ends: 100 [2020-08-21 15:50:43,267 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 15:50:43,268 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 [2020-08-21 15:50:43,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 15:50:43,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 15:50:43,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 15:50:43,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 15:50:43,274 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 15:50:43,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:43,274 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 15:50:43,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 15:50:43,274 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 15:50:43,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 15:50:43,275 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:43,275 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] [2020-08-21 15:50:43,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 15:50:43,276 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:43,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:43,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-21 15:50:43,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:43,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657475937] [2020-08-21 15:50:43,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:43,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:43,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:43,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:43,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:43,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:44,524 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:44,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657475937] [2020-08-21 15:50:44,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:44,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 15:50:44,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904104436] [2020-08-21 15:50:44,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 15:50:44,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:44,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 15:50:44,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 15:50:44,526 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 15:50:44,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:44,907 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 15:50:44,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 15:50:44,907 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 15:50:44,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:44,908 INFO L225 Difference]: With dead ends: 102 [2020-08-21 15:50:44,908 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 15:50:44,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-21 15:50:44,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 15:50:44,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 15:50:44,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 15:50:44,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 15:50:44,912 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 15:50:44,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:44,912 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 15:50:44,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 15:50:44,912 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 15:50:44,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 15:50:44,913 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:44,913 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] [2020-08-21 15:50:44,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 15:50:44,913 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:44,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:44,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-21 15:50:44,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:44,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [635946538] [2020-08-21 15:50:44,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:44,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:44,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:44,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:44,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:44,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:46,414 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:46,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [635946538] [2020-08-21 15:50:46,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:46,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 15:50:46,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489825936] [2020-08-21 15:50:46,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 15:50:46,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:46,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 15:50:46,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 15:50:46,416 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 15:50:46,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:46,703 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 15:50:46,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 15:50:46,704 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 15:50:46,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:46,705 INFO L225 Difference]: With dead ends: 104 [2020-08-21 15:50:46,705 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 15:50:46,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 15:50:46,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 15:50:46,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 15:50:46,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 15:50:46,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 15:50:46,711 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 15:50:46,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:46,711 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 15:50:46,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 15:50:46,711 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 15:50:46,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 15:50:46,712 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:46,712 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] [2020-08-21 15:50:46,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 15:50:46,713 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:46,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:46,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-21 15:50:46,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:46,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196125421] [2020-08-21 15:50:46,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:46,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:46,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:46,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:46,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:46,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:48,059 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:48,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196125421] [2020-08-21 15:50:48,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:48,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 15:50:48,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46002572] [2020-08-21 15:50:48,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 15:50:48,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:48,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 15:50:48,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 15:50:48,062 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 15:50:48,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:48,506 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 15:50:48,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 15:50:48,507 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 15:50:48,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:48,508 INFO L225 Difference]: With dead ends: 106 [2020-08-21 15:50:48,508 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 15:50:48,509 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 [2020-08-21 15:50:48,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 15:50:48,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 15:50:48,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 15:50:48,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 15:50:48,515 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 15:50:48,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:48,515 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 15:50:48,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 15:50:48,515 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 15:50:48,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 15:50:48,516 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:48,516 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] [2020-08-21 15:50:48,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 15:50:48,516 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:48,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:48,517 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-21 15:50:48,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:48,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1205908513] [2020-08-21 15:50:48,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:48,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:48,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:48,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:48,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:48,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:49,945 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:49,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1205908513] [2020-08-21 15:50:49,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:49,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 15:50:49,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458376161] [2020-08-21 15:50:49,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 15:50:49,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:49,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 15:50:49,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 15:50:49,947 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 15:50:50,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:50,359 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 15:50:50,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 15:50:50,360 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 15:50:50,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:50,361 INFO L225 Difference]: With dead ends: 108 [2020-08-21 15:50:50,361 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 15:50:50,362 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 [2020-08-21 15:50:50,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 15:50:50,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 15:50:50,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 15:50:50,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 15:50:50,367 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 15:50:50,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:50,368 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 15:50:50,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 15:50:50,368 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 15:50:50,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 15:50:50,369 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:50,369 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] [2020-08-21 15:50:50,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 15:50:50,370 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:50,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:50,370 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-21 15:50:50,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:50,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12403696] [2020-08-21 15:50:50,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:50,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:50,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:50,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:50,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:50,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:51,866 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:51,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12403696] [2020-08-21 15:50:51,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:51,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 15:50:51,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663603439] [2020-08-21 15:50:51,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 15:50:51,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:51,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 15:50:51,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 15:50:51,868 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 15:50:52,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:52,328 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 15:50:52,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 15:50:52,328 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 15:50:52,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:52,330 INFO L225 Difference]: With dead ends: 110 [2020-08-21 15:50:52,330 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 15:50:52,331 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 [2020-08-21 15:50:52,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 15:50:52,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 15:50:52,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 15:50:52,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 15:50:52,335 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 15:50:52,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:52,336 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 15:50:52,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 15:50:52,336 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 15:50:52,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 15:50:52,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:52,336 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] [2020-08-21 15:50:52,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 15:50:52,337 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:52,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:52,337 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-21 15:50:52,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:52,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1781885739] [2020-08-21 15:50:52,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:52,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:52,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:52,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:52,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:52,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:53,961 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:53,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1781885739] [2020-08-21 15:50:53,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:53,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 15:50:53,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229311306] [2020-08-21 15:50:53,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 15:50:53,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:53,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 15:50:53,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 15:50:53,963 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 15:50:54,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:54,438 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 15:50:54,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 15:50:54,439 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 15:50:54,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:54,441 INFO L225 Difference]: With dead ends: 112 [2020-08-21 15:50:54,441 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 15:50:54,441 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 [2020-08-21 15:50:54,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 15:50:54,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 15:50:54,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 15:50:54,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 15:50:54,450 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 15:50:54,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:54,450 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 15:50:54,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 15:50:54,451 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 15:50:54,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 15:50:54,451 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:54,451 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] [2020-08-21 15:50:54,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 15:50:54,454 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:54,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:54,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-21 15:50:54,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:54,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370222586] [2020-08-21 15:50:54,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:54,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:54,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:54,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:54,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:54,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:56,230 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:56,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370222586] [2020-08-21 15:50:56,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:56,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 15:50:56,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637352447] [2020-08-21 15:50:56,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 15:50:56,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:56,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 15:50:56,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 15:50:56,232 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 15:50:56,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:56,707 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 15:50:56,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 15:50:56,707 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 15:50:56,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:56,708 INFO L225 Difference]: With dead ends: 114 [2020-08-21 15:50:56,708 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 15:50:56,709 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 [2020-08-21 15:50:56,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 15:50:56,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 15:50:56,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 15:50:56,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 15:50:56,719 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 15:50:56,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:56,719 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 15:50:56,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 15:50:56,725 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 15:50:56,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 15:50:56,726 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:56,726 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] [2020-08-21 15:50:56,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 15:50:56,726 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:56,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:56,726 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-21 15:50:56,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:56,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1342298837] [2020-08-21 15:50:56,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:56,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:56,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:56,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:56,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:56,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:58,551 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:50:58,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1342298837] [2020-08-21 15:50:58,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:58,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 15:50:58,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809039902] [2020-08-21 15:50:58,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 15:50:58,553 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:58,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 15:50:58,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 15:50:58,554 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 15:50:58,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:58,918 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 15:50:58,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 15:50:58,919 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 15:50:58,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:58,920 INFO L225 Difference]: With dead ends: 116 [2020-08-21 15:50:58,920 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 15:50:58,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 15:50:58,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 15:50:58,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 15:50:58,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 15:50:58,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 15:50:58,926 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 15:50:58,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:58,926 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 15:50:58,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 15:50:58,927 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 15:50:58,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 15:50:58,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:58,927 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] [2020-08-21 15:50:58,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 15:50:58,928 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:58,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:58,928 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-21 15:50:58,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:58,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [733303780] [2020-08-21 15:50:58,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:58,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:58,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:58,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:59,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:50:59,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:00,824 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:00,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [733303780] [2020-08-21 15:51:00,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:00,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 15:51:00,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [408526084] [2020-08-21 15:51:00,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 15:51:00,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:00,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 15:51:00,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 15:51:00,825 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 15:51:01,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:01,282 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 15:51:01,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 15:51:01,282 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 15:51:01,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:01,284 INFO L225 Difference]: With dead ends: 118 [2020-08-21 15:51:01,284 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 15:51:01,285 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 [2020-08-21 15:51:01,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 15:51:01,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 15:51:01,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 15:51:01,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 15:51:01,289 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 15:51:01,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:01,290 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 15:51:01,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 15:51:01,290 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 15:51:01,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 15:51:01,291 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:01,291 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] [2020-08-21 15:51:01,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 15:51:01,291 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:01,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:01,291 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-21 15:51:01,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:01,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184019260] [2020-08-21 15:51:01,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:01,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:01,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:01,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:01,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:01,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:03,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:03,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184019260] [2020-08-21 15:51:03,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:03,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 15:51:03,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302868181] [2020-08-21 15:51:03,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 15:51:03,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:03,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 15:51:03,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 15:51:03,338 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 15:51:03,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:03,782 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 15:51:03,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 15:51:03,783 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 15:51:03,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:03,784 INFO L225 Difference]: With dead ends: 120 [2020-08-21 15:51:03,784 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 15:51:03,785 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 [2020-08-21 15:51:03,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 15:51:03,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 15:51:03,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 15:51:03,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 15:51:03,789 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 15:51:03,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:03,790 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 15:51:03,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 15:51:03,790 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 15:51:03,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 15:51:03,791 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:03,791 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] [2020-08-21 15:51:03,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 15:51:03,791 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:03,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:03,791 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-21 15:51:03,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:03,792 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1389145196] [2020-08-21 15:51:03,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:03,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:03,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:03,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:03,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:03,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:05,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1389145196] [2020-08-21 15:51:05,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:05,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 15:51:05,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685964889] [2020-08-21 15:51:05,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 15:51:05,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:05,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 15:51:05,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 15:51:05,868 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 15:51:06,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:06,221 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 15:51:06,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 15:51:06,221 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 15:51:06,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:06,222 INFO L225 Difference]: With dead ends: 122 [2020-08-21 15:51:06,223 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 15:51:06,224 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 [2020-08-21 15:51:06,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 15:51:06,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 15:51:06,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 15:51:06,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 15:51:06,230 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 15:51:06,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:06,230 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 15:51:06,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 15:51:06,230 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 15:51:06,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 15:51:06,232 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:06,232 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] [2020-08-21 15:51:06,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 15:51:06,232 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:06,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:06,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-21 15:51:06,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:06,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705063894] [2020-08-21 15:51:06,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:06,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:06,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:06,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:06,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:06,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:08,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705063894] [2020-08-21 15:51:08,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:08,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 15:51:08,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937389197] [2020-08-21 15:51:08,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 15:51:08,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:08,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 15:51:08,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 15:51:08,424 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 15:51:08,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:08,749 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 15:51:08,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 15:51:08,750 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 15:51:08,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:08,751 INFO L225 Difference]: With dead ends: 124 [2020-08-21 15:51:08,751 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 15:51:08,752 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 [2020-08-21 15:51:08,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 15:51:08,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 15:51:08,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 15:51:08,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 15:51:08,758 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 15:51:08,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:08,758 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 15:51:08,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 15:51:08,758 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 15:51:08,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 15:51:08,759 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:08,759 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] [2020-08-21 15:51:08,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 15:51:08,760 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:08,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:08,760 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-21 15:51:08,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:08,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1294210990] [2020-08-21 15:51:08,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:08,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:08,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:08,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:11,058 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:11,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1294210990] [2020-08-21 15:51:11,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:11,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 15:51:11,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521158089] [2020-08-21 15:51:11,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 15:51:11,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:11,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 15:51:11,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 15:51:11,060 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 15:51:11,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:11,425 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 15:51:11,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 15:51:11,426 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 15:51:11,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:11,427 INFO L225 Difference]: With dead ends: 126 [2020-08-21 15:51:11,427 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 15:51:11,428 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 [2020-08-21 15:51:11,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 15:51:11,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 15:51:11,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 15:51:11,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 15:51:11,432 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 15:51:11,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:11,432 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 15:51:11,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 15:51:11,433 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 15:51:11,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 15:51:11,433 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:11,434 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] [2020-08-21 15:51:11,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 15:51:11,434 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:11,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:11,434 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-21 15:51:11,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:11,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [207420738] [2020-08-21 15:51:11,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:11,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:11,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:11,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:11,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:11,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:13,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:13,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [207420738] [2020-08-21 15:51:13,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:13,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 15:51:13,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100188272] [2020-08-21 15:51:13,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 15:51:13,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:13,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 15:51:13,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 15:51:13,868 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 15:51:14,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:14,318 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 15:51:14,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 15:51:14,319 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 15:51:14,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:14,320 INFO L225 Difference]: With dead ends: 128 [2020-08-21 15:51:14,320 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 15:51:14,321 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 [2020-08-21 15:51:14,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 15:51:14,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 15:51:14,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 15:51:14,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 15:51:14,328 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 15:51:14,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:14,328 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 15:51:14,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 15:51:14,328 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 15:51:14,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 15:51:14,329 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:14,329 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] [2020-08-21 15:51:14,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 15:51:14,330 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:14,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:14,330 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-21 15:51:14,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:14,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2048803578] [2020-08-21 15:51:14,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:14,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:14,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:14,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:14,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:14,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:16,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 15:51:16,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2048803578] [2020-08-21 15:51:16,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:16,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 15:51:16,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208647821] [2020-08-21 15:51:16,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 15:51:16,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:16,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 15:51:16,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 15:51:16,866 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 15:51:17,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:17,462 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 15:51:17,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 15:51:17,463 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 15:51:17,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:17,464 INFO L225 Difference]: With dead ends: 130 [2020-08-21 15:51:17,464 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 15:51:17,466 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 [2020-08-21 15:51:17,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 15:51:17,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 15:51:17,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 15:51:17,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 15:51:17,475 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 15:51:17,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:17,476 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 15:51:17,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 15:51:17,476 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 15:51:17,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 15:51:17,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:17,478 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] [2020-08-21 15:51:17,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 15:51:17,478 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:17,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:17,479 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-21 15:51:17,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:17,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1850763975] [2020-08-21 15:51:17,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:17,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:17,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:17,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:17,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 15:51:17,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat