/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 19:37:01,656 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 19:37:01,658 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 19:37:01,702 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 19:37:01,726 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 19:37:01,729 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 19:37:01,732 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 19:37:01,733 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 19:37:01,735 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 19:37:01,736 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 19:37:01,738 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 19:37:01,747 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 19:37:01,750 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 19:37:01,751 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 19:37:01,752 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 19:37:01,753 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 19:37:01,768 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 19:37:01,781 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 19:37:01,784 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 19:37:01,785 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 19:37:01,787 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 19:37:01,826 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 19:37:01,826 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 19:37:01,828 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 19:37:01,828 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 19:37:01,829 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 19:37:01,829 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 19:37:01,829 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 19:37:01,829 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 19:37:01,829 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 19:37:01,830 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 19:37:01,831 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 19:37:01,831 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 19:37:01,831 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 19:37:01,832 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 19:37:01,832 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 19:37:01,832 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 19:37:01,832 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 19:37:01,833 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 19:37:01,833 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 19:37:01,833 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 19:37:01,834 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 19:37:01,834 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 19:37:01,834 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 19:37:01,834 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 19:37:01,834 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 19:37:01,835 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 19:37:01,835 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 19:37:01,835 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 19:37:01,835 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 19:37:01,835 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER; [2020-08-18 19:37:02,136 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 19:37:02,147 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 19:37:02,153 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 19:37:02,154 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 19:37:02,155 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 19:37:02,156 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 19:37:02,217 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0fd00c0ce/e9b0147d90b149699779b1c93ae95f19/FLAG8aa06a983 [2020-08-18 19:37:02,691 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 19:37:02,691 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 19:37:02,698 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0fd00c0ce/e9b0147d90b149699779b1c93ae95f19/FLAG8aa06a983 [2020-08-18 19:37:03,072 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0fd00c0ce/e9b0147d90b149699779b1c93ae95f19 [2020-08-18 19:37:03,081 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 19:37:03,082 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 19:37:03,083 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 19:37:03,084 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 19:37:03,086 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 19:37:03,087 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:37:03" (1/1) ... [2020-08-18 19:37:03,090 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ffa8910 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:03, skipping insertion in model container [2020-08-18 19:37:03,090 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:37:03" (1/1) ... [2020-08-18 19:37:03,097 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 19:37:03,114 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 19:37:03,290 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:37:03,373 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 19:37:03,392 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:37:03,537 INFO L208 MainTranslator]: Completed translation [2020-08-18 19:37:03,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:03 WrapperNode [2020-08-18 19:37:03,538 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 19:37:03,539 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 19:37:03,539 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 19:37:03,539 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 19:37:03,549 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:03" (1/1) ... [2020-08-18 19:37:03,549 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:03" (1/1) ... [2020-08-18 19:37:03,558 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:03" (1/1) ... [2020-08-18 19:37:03,558 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:03" (1/1) ... [2020-08-18 19:37:03,580 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:03" (1/1) ... [2020-08-18 19:37:03,588 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:03" (1/1) ... [2020-08-18 19:37:03,590 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:03" (1/1) ... [2020-08-18 19:37:03,596 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 19:37:03,596 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 19:37:03,597 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 19:37:03,597 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 19:37:03,597 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:03" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 19:37:03,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 19:37:03,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 19:37:03,658 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 19:37:03,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 19:37:03,658 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 19:37:03,658 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 19:37:03,658 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 19:37:03,658 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 19:37:03,659 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 19:37:03,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-18 19:37:03,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 19:37:03,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 19:37:03,906 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 19:37:03,906 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 19:37:03,910 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:37:03 BoogieIcfgContainer [2020-08-18 19:37:03,910 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 19:37:03,919 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 19:37:03,920 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 19:37:03,932 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 19:37:03,932 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 07:37:03" (1/3) ... [2020-08-18 19:37:03,933 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@105840a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:37:03, skipping insertion in model container [2020-08-18 19:37:03,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:37:03" (2/3) ... [2020-08-18 19:37:03,934 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@105840a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:37:03, skipping insertion in model container [2020-08-18 19:37:03,934 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:37:03" (3/3) ... [2020-08-18 19:37:03,936 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-18 19:37:03,955 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 19:37:03,961 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 19:37:03,971 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 19:37:03,990 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 19:37:03,990 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 19:37:03,990 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 19:37:03,990 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 19:37:03,990 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 19:37:03,990 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 19:37:03,991 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 19:37:03,991 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 19:37:04,007 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-18 19:37:04,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 19:37:04,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:04,013 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:04,013 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:04,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:04,020 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-18 19:37:04,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:04,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1999459195] [2020-08-18 19:37:04,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:04,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:04,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:04,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:04,235 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:04,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1999459195] [2020-08-18 19:37:04,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:04,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 19:37:04,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889526135] [2020-08-18 19:37:04,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 19:37:04,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:04,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 19:37:04,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 19:37:04,263 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-18 19:37:04,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:04,363 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-18 19:37:04,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 19:37:04,365 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-18 19:37:04,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:04,375 INFO L225 Difference]: With dead ends: 42 [2020-08-18 19:37:04,378 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 19:37:04,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 19:37:04,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 19:37:04,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-18 19:37:04,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 19:37:04,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 19:37:04,422 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-18 19:37:04,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:04,423 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 19:37:04,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 19:37:04,423 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 19:37:04,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 19:37:04,424 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:04,424 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:04,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 19:37:04,425 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:04,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:04,425 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-18 19:37:04,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:04,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1675426972] [2020-08-18 19:37:04,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:04,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:04,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:04,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:04,552 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:04,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1675426972] [2020-08-18 19:37:04,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:04,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 19:37:04,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852695272] [2020-08-18 19:37:04,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 19:37:04,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:04,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 19:37:04,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 19:37:04,556 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-18 19:37:04,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:04,662 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-18 19:37:04,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 19:37:04,663 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-18 19:37:04,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:04,664 INFO L225 Difference]: With dead ends: 36 [2020-08-18 19:37:04,664 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 19:37:04,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:37:04,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 19:37:04,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-18 19:37:04,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 19:37:04,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 19:37:04,672 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-18 19:37:04,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:04,673 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 19:37:04,673 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 19:37:04,673 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 19:37:04,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 19:37:04,674 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:04,674 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:04,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 19:37:04,674 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:04,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:04,675 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-18 19:37:04,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:04,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285292966] [2020-08-18 19:37:04,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:04,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:04,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:04,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:04,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:04,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285292966] [2020-08-18 19:37:04,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:04,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 19:37:04,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374045556] [2020-08-18 19:37:04,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 19:37:04,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:04,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 19:37:04,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 19:37:04,770 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-18 19:37:04,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:04,914 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-18 19:37:04,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 19:37:04,915 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 19:37:04,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:04,916 INFO L225 Difference]: With dead ends: 40 [2020-08-18 19:37:04,916 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 19:37:04,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:37:04,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 19:37:04,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-18 19:37:04,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 19:37:04,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 19:37:04,930 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-18 19:37:04,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:04,930 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 19:37:04,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 19:37:04,931 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 19:37:04,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 19:37:04,933 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:04,933 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:04,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 19:37:04,934 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:04,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:04,934 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-18 19:37:04,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:04,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1636084020] [2020-08-18 19:37:04,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:04,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:05,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:05,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:05,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:05,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1636084020] [2020-08-18 19:37:05,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:37:05,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 19:37:05,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142598480] [2020-08-18 19:37:05,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 19:37:05,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:05,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 19:37:05,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 19:37:05,021 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-18 19:37:05,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:05,093 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-18 19:37:05,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 19:37:05,094 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-18 19:37:05,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:05,095 INFO L225 Difference]: With dead ends: 31 [2020-08-18 19:37:05,095 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 19:37:05,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:37:05,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 19:37:05,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-18 19:37:05,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 19:37:05,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 19:37:05,111 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-18 19:37:05,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:05,111 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 19:37:05,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 19:37:05,112 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 19:37:05,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 19:37:05,112 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:05,113 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:05,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 19:37:05,120 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:05,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:05,121 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-18 19:37:05,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:05,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557365644] [2020-08-18 19:37:05,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:05,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:05,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:05,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:05,292 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:05,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557365644] [2020-08-18 19:37:05,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:05,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 19:37:05,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470400413] [2020-08-18 19:37:05,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 19:37:05,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:05,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 19:37:05,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:37:05,295 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-18 19:37:05,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:05,379 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-18 19:37:05,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 19:37:05,380 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-18 19:37:05,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:05,381 INFO L225 Difference]: With dead ends: 34 [2020-08-18 19:37:05,381 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 19:37:05,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:37:05,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 19:37:05,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-18 19:37:05,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 19:37:05,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 19:37:05,388 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-18 19:37:05,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:05,389 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 19:37:05,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 19:37:05,389 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 19:37:05,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 19:37:05,390 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:05,390 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:05,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 19:37:05,391 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:05,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:05,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-18 19:37:05,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:05,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1806570222] [2020-08-18 19:37:05,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:05,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:05,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:05,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:05,534 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:05,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1806570222] [2020-08-18 19:37:05,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:05,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 19:37:05,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553503272] [2020-08-18 19:37:05,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 19:37:05,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:05,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 19:37:05,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:37:05,537 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-18 19:37:05,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:05,640 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-18 19:37:05,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 19:37:05,640 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 19:37:05,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:05,641 INFO L225 Difference]: With dead ends: 38 [2020-08-18 19:37:05,641 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 19:37:05,642 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-18 19:37:05,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 19:37:05,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-18 19:37:05,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 19:37:05,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-18 19:37:05,648 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-18 19:37:05,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:05,648 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-18 19:37:05,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 19:37:05,649 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-18 19:37:05,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 19:37:05,649 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:05,649 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:05,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 19:37:05,650 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:05,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:05,650 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-18 19:37:05,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:05,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1967454601] [2020-08-18 19:37:05,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:05,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:05,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:05,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:05,819 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:05,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1967454601] [2020-08-18 19:37:05,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:05,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 19:37:05,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590906229] [2020-08-18 19:37:05,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 19:37:05,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:05,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 19:37:05,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 19:37:05,821 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-18 19:37:05,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:05,926 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-18 19:37:05,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 19:37:05,927 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-18 19:37:05,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:05,928 INFO L225 Difference]: With dead ends: 42 [2020-08-18 19:37:05,928 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 19:37:05,929 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 19:37:05,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 19:37:05,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-18 19:37:05,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 19:37:05,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 19:37:05,935 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-18 19:37:05,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:05,935 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 19:37:05,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 19:37:05,935 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 19:37:05,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 19:37:05,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:05,936 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:05,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 19:37:05,937 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:05,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:05,937 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-18 19:37:05,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:05,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [687261350] [2020-08-18 19:37:05,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:05,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:06,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:06,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:06,074 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:06,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [687261350] [2020-08-18 19:37:06,075 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:06,075 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 19:37:06,075 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504037708] [2020-08-18 19:37:06,075 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 19:37:06,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:06,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 19:37:06,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 19:37:06,076 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-18 19:37:06,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:06,201 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-18 19:37:06,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 19:37:06,202 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-18 19:37:06,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:06,203 INFO L225 Difference]: With dead ends: 46 [2020-08-18 19:37:06,203 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 19:37:06,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 19:37:06,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 19:37:06,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-18 19:37:06,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 19:37:06,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-18 19:37:06,209 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-18 19:37:06,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:06,210 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-18 19:37:06,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 19:37:06,210 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-18 19:37:06,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 19:37:06,211 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:06,211 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:06,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 19:37:06,211 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:06,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:06,212 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-18 19:37:06,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:06,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [972594732] [2020-08-18 19:37:06,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:06,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:06,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:06,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:06,361 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:06,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [972594732] [2020-08-18 19:37:06,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:06,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 19:37:06,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996586798] [2020-08-18 19:37:06,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 19:37:06,363 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:06,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 19:37:06,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-18 19:37:06,364 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-18 19:37:06,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:06,524 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-18 19:37:06,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 19:37:06,526 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-18 19:37:06,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:06,527 INFO L225 Difference]: With dead ends: 50 [2020-08-18 19:37:06,527 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 19:37:06,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 19:37:06,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 19:37:06,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 19:37:06,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 19:37:06,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-18 19:37:06,540 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-18 19:37:06,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:06,541 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-18 19:37:06,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 19:37:06,541 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-18 19:37:06,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 19:37:06,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:06,544 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:06,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 19:37:06,544 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:06,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:06,546 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-18 19:37:06,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:06,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [979065610] [2020-08-18 19:37:06,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:06,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:06,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:06,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:06,749 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:06,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [979065610] [2020-08-18 19:37:06,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:06,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 19:37:06,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810012404] [2020-08-18 19:37:06,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 19:37:06,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:06,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 19:37:06,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-18 19:37:06,761 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-18 19:37:06,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:06,937 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-18 19:37:06,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 19:37:06,939 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 19:37:06,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:06,940 INFO L225 Difference]: With dead ends: 54 [2020-08-18 19:37:06,940 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 19:37:06,940 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-18 19:37:06,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 19:37:06,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-18 19:37:06,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 19:37:06,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-18 19:37:06,950 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-18 19:37:06,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:06,950 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-18 19:37:06,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 19:37:06,951 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-18 19:37:06,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 19:37:06,954 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:06,954 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:06,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 19:37:06,955 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:06,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:06,955 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-18 19:37:06,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:06,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1149636951] [2020-08-18 19:37:06,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:06,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:07,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:07,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:07,163 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:07,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1149636951] [2020-08-18 19:37:07,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:07,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 19:37:07,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044722708] [2020-08-18 19:37:07,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 19:37:07,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:07,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 19:37:07,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-18 19:37:07,166 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-18 19:37:07,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:07,379 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-18 19:37:07,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 19:37:07,380 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-18 19:37:07,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:07,381 INFO L225 Difference]: With dead ends: 58 [2020-08-18 19:37:07,381 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 19:37:07,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-18 19:37:07,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 19:37:07,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-18 19:37:07,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 19:37:07,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-18 19:37:07,387 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-18 19:37:07,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:07,388 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-18 19:37:07,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 19:37:07,388 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-18 19:37:07,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 19:37:07,389 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:07,389 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:07,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 19:37:07,390 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:07,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:07,390 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-18 19:37:07,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:07,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640371298] [2020-08-18 19:37:07,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:07,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:07,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:07,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:07,598 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:07,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640371298] [2020-08-18 19:37:07,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:07,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 19:37:07,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102027299] [2020-08-18 19:37:07,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 19:37:07,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:07,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 19:37:07,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 19:37:07,601 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-18 19:37:07,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:07,834 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-18 19:37:07,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 19:37:07,834 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-18 19:37:07,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:07,835 INFO L225 Difference]: With dead ends: 62 [2020-08-18 19:37:07,835 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 19:37:07,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-18 19:37:07,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 19:37:07,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-18 19:37:07,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 19:37:07,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-18 19:37:07,845 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-18 19:37:07,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:07,846 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-18 19:37:07,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 19:37:07,846 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-18 19:37:07,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 19:37:07,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:07,852 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:07,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 19:37:07,852 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:07,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:07,853 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-18 19:37:07,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:07,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784379103] [2020-08-18 19:37:07,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:07,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:08,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:08,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:08,118 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:08,119 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784379103] [2020-08-18 19:37:08,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:08,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 19:37:08,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435935236] [2020-08-18 19:37:08,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 19:37:08,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:08,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 19:37:08,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-18 19:37:08,121 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-18 19:37:08,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:08,380 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-18 19:37:08,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 19:37:08,381 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-18 19:37:08,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:08,384 INFO L225 Difference]: With dead ends: 66 [2020-08-18 19:37:08,384 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 19:37:08,385 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-18 19:37:08,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 19:37:08,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-18 19:37:08,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 19:37:08,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-18 19:37:08,396 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-18 19:37:08,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:08,397 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-18 19:37:08,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 19:37:08,397 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-18 19:37:08,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 19:37:08,401 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:08,401 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:08,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 19:37:08,401 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:08,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:08,402 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-18 19:37:08,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:08,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [533175845] [2020-08-18 19:37:08,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:08,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:08,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:08,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:08,693 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:08,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [533175845] [2020-08-18 19:37:08,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:08,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 19:37:08,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545542919] [2020-08-18 19:37:08,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 19:37:08,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:08,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 19:37:08,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-18 19:37:08,697 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-18 19:37:09,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:09,089 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-18 19:37:09,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 19:37:09,089 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-18 19:37:09,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:09,090 INFO L225 Difference]: With dead ends: 70 [2020-08-18 19:37:09,090 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 19:37:09,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-18 19:37:09,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 19:37:09,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-18 19:37:09,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 19:37:09,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-18 19:37:09,104 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-18 19:37:09,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:09,105 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-18 19:37:09,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 19:37:09,105 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-18 19:37:09,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 19:37:09,106 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:09,106 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:09,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 19:37:09,107 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:09,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:09,107 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-18 19:37:09,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:09,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412803074] [2020-08-18 19:37:09,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:09,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:09,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:09,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:09,379 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:09,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412803074] [2020-08-18 19:37:09,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:09,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 19:37:09,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006316058] [2020-08-18 19:37:09,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 19:37:09,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:09,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 19:37:09,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-18 19:37:09,381 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-18 19:37:09,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:09,754 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-18 19:37:09,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 19:37:09,754 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 19:37:09,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:09,755 INFO L225 Difference]: With dead ends: 74 [2020-08-18 19:37:09,756 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 19:37:09,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-18 19:37:09,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 19:37:09,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-18 19:37:09,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 19:37:09,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-18 19:37:09,763 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-18 19:37:09,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:09,764 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-18 19:37:09,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 19:37:09,764 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-18 19:37:09,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 19:37:09,765 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:09,765 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:09,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 19:37:09,765 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:09,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:09,766 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-18 19:37:09,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:09,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1874765347] [2020-08-18 19:37:09,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:09,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:10,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:10,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:10,080 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:10,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1874765347] [2020-08-18 19:37:10,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:10,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 19:37:10,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351410831] [2020-08-18 19:37:10,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 19:37:10,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:10,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 19:37:10,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-18 19:37:10,083 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-18 19:37:10,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:10,507 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-18 19:37:10,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 19:37:10,508 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-18 19:37:10,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:10,508 INFO L225 Difference]: With dead ends: 78 [2020-08-18 19:37:10,509 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 19:37:10,509 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-18 19:37:10,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 19:37:10,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-18 19:37:10,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 19:37:10,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-18 19:37:10,514 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-18 19:37:10,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:10,515 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-18 19:37:10,515 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 19:37:10,515 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-18 19:37:10,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 19:37:10,516 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:10,516 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:10,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 19:37:10,516 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:10,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:10,517 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-18 19:37:10,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:10,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1392301930] [2020-08-18 19:37:10,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:10,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:10,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:10,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:10,829 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:10,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1392301930] [2020-08-18 19:37:10,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:10,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 19:37:10,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196921088] [2020-08-18 19:37:10,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 19:37:10,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:10,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 19:37:10,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-18 19:37:10,831 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-18 19:37:11,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:11,240 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-18 19:37:11,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 19:37:11,240 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-18 19:37:11,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:11,241 INFO L225 Difference]: With dead ends: 82 [2020-08-18 19:37:11,241 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 19:37:11,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-18 19:37:11,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 19:37:11,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-18 19:37:11,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 19:37:11,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-18 19:37:11,247 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-18 19:37:11,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:11,248 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-18 19:37:11,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 19:37:11,248 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-18 19:37:11,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 19:37:11,249 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:11,249 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:11,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 19:37:11,249 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:11,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:11,250 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-18 19:37:11,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:11,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1884413124] [2020-08-18 19:37:11,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:11,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:11,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:11,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:11,588 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:11,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1884413124] [2020-08-18 19:37:11,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:11,590 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 19:37:11,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962005678] [2020-08-18 19:37:11,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 19:37:11,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:11,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 19:37:11,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-18 19:37:11,592 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-18 19:37:12,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:12,113 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-18 19:37:12,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 19:37:12,113 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-18 19:37:12,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:12,114 INFO L225 Difference]: With dead ends: 86 [2020-08-18 19:37:12,114 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 19:37:12,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-18 19:37:12,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 19:37:12,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-18 19:37:12,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 19:37:12,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-18 19:37:12,124 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-18 19:37:12,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:12,124 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-18 19:37:12,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 19:37:12,125 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-18 19:37:12,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 19:37:12,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:12,125 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:12,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 19:37:12,126 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:12,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:12,126 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-18 19:37:12,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:12,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1230267840] [2020-08-18 19:37:12,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:12,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:12,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:12,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:12,472 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:12,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1230267840] [2020-08-18 19:37:12,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:12,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 19:37:12,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376942167] [2020-08-18 19:37:12,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 19:37:12,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:12,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 19:37:12,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-18 19:37:12,476 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-18 19:37:13,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:13,022 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-18 19:37:13,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 19:37:13,023 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-18 19:37:13,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:13,023 INFO L225 Difference]: With dead ends: 90 [2020-08-18 19:37:13,023 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 19:37:13,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-18 19:37:13,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 19:37:13,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-18 19:37:13,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 19:37:13,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-18 19:37:13,030 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-18 19:37:13,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:13,030 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-18 19:37:13,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 19:37:13,030 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-18 19:37:13,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 19:37:13,031 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:13,031 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:13,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 19:37:13,032 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:13,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:13,032 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-18 19:37:13,032 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:13,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1602108182] [2020-08-18 19:37:13,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:13,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:13,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:13,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:13,441 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:13,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1602108182] [2020-08-18 19:37:13,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:13,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 19:37:13,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031358852] [2020-08-18 19:37:13,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 19:37:13,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:13,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 19:37:13,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-18 19:37:13,444 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-18 19:37:14,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:14,057 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-18 19:37:14,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 19:37:14,057 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-18 19:37:14,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:14,058 INFO L225 Difference]: With dead ends: 94 [2020-08-18 19:37:14,058 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 19:37:14,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-18 19:37:14,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 19:37:14,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-18 19:37:14,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 19:37:14,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-18 19:37:14,069 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-18 19:37:14,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:14,070 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-18 19:37:14,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 19:37:14,070 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-18 19:37:14,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 19:37:14,071 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:14,071 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:14,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 19:37:14,071 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:14,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:14,072 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-18 19:37:14,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:14,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2890585] [2020-08-18 19:37:14,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:14,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:14,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:14,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:14,489 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:14,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2890585] [2020-08-18 19:37:14,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:14,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 19:37:14,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470341823] [2020-08-18 19:37:14,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 19:37:14,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:14,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 19:37:14,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-18 19:37:14,494 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-18 19:37:15,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:15,078 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-18 19:37:15,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 19:37:15,079 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-18 19:37:15,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:15,080 INFO L225 Difference]: With dead ends: 98 [2020-08-18 19:37:15,080 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 19:37:15,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-18 19:37:15,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 19:37:15,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-18 19:37:15,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 19:37:15,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-18 19:37:15,093 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-18 19:37:15,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:15,093 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-18 19:37:15,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 19:37:15,094 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-18 19:37:15,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 19:37:15,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:15,094 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:15,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 19:37:15,094 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:15,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:15,095 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-18 19:37:15,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:15,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1712460039] [2020-08-18 19:37:15,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:15,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:15,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:15,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:15,562 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:15,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1712460039] [2020-08-18 19:37:15,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:15,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 19:37:15,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878370396] [2020-08-18 19:37:15,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 19:37:15,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:15,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 19:37:15,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-18 19:37:15,565 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-18 19:37:16,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:16,223 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-18 19:37:16,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 19:37:16,228 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-18 19:37:16,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:16,229 INFO L225 Difference]: With dead ends: 102 [2020-08-18 19:37:16,229 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 19:37:16,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-18 19:37:16,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 19:37:16,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-18 19:37:16,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 19:37:16,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-18 19:37:16,240 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-18 19:37:16,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:16,240 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-18 19:37:16,241 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 19:37:16,241 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-18 19:37:16,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 19:37:16,241 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:16,241 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:16,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 19:37:16,244 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:16,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:16,244 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-18 19:37:16,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:16,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027974998] [2020-08-18 19:37:16,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:16,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:16,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:16,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:16,706 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:16,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027974998] [2020-08-18 19:37:16,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:16,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 19:37:16,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612902364] [2020-08-18 19:37:16,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 19:37:16,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:16,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 19:37:16,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-18 19:37:16,709 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-18 19:37:17,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:17,458 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-18 19:37:17,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 19:37:17,459 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-18 19:37:17,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:17,460 INFO L225 Difference]: With dead ends: 106 [2020-08-18 19:37:17,460 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 19:37:17,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-18 19:37:17,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 19:37:17,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-18 19:37:17,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 19:37:17,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-18 19:37:17,466 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-18 19:37:17,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:17,466 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-18 19:37:17,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 19:37:17,466 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-18 19:37:17,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 19:37:17,467 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:17,467 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:17,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 19:37:17,468 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:17,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:17,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-18 19:37:17,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:17,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [49461668] [2020-08-18 19:37:17,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:17,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:17,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:17,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:17,978 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:17,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [49461668] [2020-08-18 19:37:17,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:17,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 19:37:17,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9147063] [2020-08-18 19:37:17,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 19:37:17,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:17,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 19:37:17,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-18 19:37:17,980 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-18 19:37:18,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:18,733 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-18 19:37:18,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 19:37:18,735 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-18 19:37:18,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:18,736 INFO L225 Difference]: With dead ends: 110 [2020-08-18 19:37:18,736 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 19:37:18,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-18 19:37:18,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 19:37:18,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-18 19:37:18,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 19:37:18,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-18 19:37:18,742 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-18 19:37:18,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:18,743 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-18 19:37:18,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 19:37:18,743 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-18 19:37:18,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 19:37:18,743 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:18,744 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:18,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 19:37:18,744 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:18,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:18,744 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-18 19:37:18,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:18,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [936884636] [2020-08-18 19:37:18,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:18,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:19,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:19,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:19,358 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:19,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [936884636] [2020-08-18 19:37:19,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:19,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 19:37:19,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879031890] [2020-08-18 19:37:19,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 19:37:19,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:19,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 19:37:19,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-18 19:37:19,360 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-18 19:37:20,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:20,204 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-18 19:37:20,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 19:37:20,205 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-18 19:37:20,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:20,205 INFO L225 Difference]: With dead ends: 114 [2020-08-18 19:37:20,205 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 19:37:20,206 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-18 19:37:20,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 19:37:20,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-18 19:37:20,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-18 19:37:20,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-18 19:37:20,211 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-18 19:37:20,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:20,211 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-18 19:37:20,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 19:37:20,211 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-18 19:37:20,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-18 19:37:20,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:20,212 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:20,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 19:37:20,212 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:20,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:20,213 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-18 19:37:20,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:20,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283662540] [2020-08-18 19:37:20,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:20,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:20,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:20,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:20,813 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:20,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283662540] [2020-08-18 19:37:20,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:20,814 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 19:37:20,814 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313749592] [2020-08-18 19:37:20,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 19:37:20,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:20,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 19:37:20,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-18 19:37:20,816 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-18 19:37:21,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:21,784 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-18 19:37:21,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 19:37:21,786 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-18 19:37:21,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:21,787 INFO L225 Difference]: With dead ends: 118 [2020-08-18 19:37:21,787 INFO L226 Difference]: Without dead ends: 65 [2020-08-18 19:37:21,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-18 19:37:21,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-18 19:37:21,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-18 19:37:21,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-18 19:37:21,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-18 19:37:21,794 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-18 19:37:21,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:21,794 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-18 19:37:21,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 19:37:21,794 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-18 19:37:21,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 19:37:21,795 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:21,795 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:21,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 19:37:21,795 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:21,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:21,796 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-18 19:37:21,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:21,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429948215] [2020-08-18 19:37:21,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:21,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:22,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:22,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:22,453 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:22,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429948215] [2020-08-18 19:37:22,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:22,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 19:37:22,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855042098] [2020-08-18 19:37:22,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 19:37:22,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:22,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 19:37:22,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-18 19:37:22,455 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-18 19:37:23,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:23,644 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-18 19:37:23,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 19:37:23,645 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-18 19:37:23,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:23,646 INFO L225 Difference]: With dead ends: 122 [2020-08-18 19:37:23,646 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 19:37:23,647 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-18 19:37:23,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 19:37:23,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-18 19:37:23,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 19:37:23,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-18 19:37:23,652 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-18 19:37:23,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:23,652 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-18 19:37:23,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 19:37:23,653 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-18 19:37:23,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 19:37:23,653 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:23,653 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:23,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 19:37:23,654 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:23,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:23,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-18 19:37:23,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:23,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921579026] [2020-08-18 19:37:23,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:23,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:24,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:24,324 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:24,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921579026] [2020-08-18 19:37:24,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:24,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 19:37:24,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857941255] [2020-08-18 19:37:24,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 19:37:24,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:24,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 19:37:24,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-18 19:37:24,327 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-18 19:37:25,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:25,467 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-18 19:37:25,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 19:37:25,470 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-18 19:37:25,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:25,471 INFO L225 Difference]: With dead ends: 126 [2020-08-18 19:37:25,471 INFO L226 Difference]: Without dead ends: 69 [2020-08-18 19:37:25,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-18 19:37:25,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-18 19:37:25,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-18 19:37:25,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 19:37:25,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-18 19:37:25,476 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-18 19:37:25,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:25,476 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-18 19:37:25,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 19:37:25,478 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-18 19:37:25,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-18 19:37:25,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:25,478 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:25,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 19:37:25,479 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:25,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:25,479 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-18 19:37:25,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:25,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2082098025] [2020-08-18 19:37:25,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:25,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:26,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:26,162 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:26,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2082098025] [2020-08-18 19:37:26,166 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:26,166 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 19:37:26,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929614326] [2020-08-18 19:37:26,167 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 19:37:26,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:26,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 19:37:26,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-18 19:37:26,170 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-18 19:37:27,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:27,393 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-18 19:37:27,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 19:37:27,396 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-18 19:37:27,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:27,397 INFO L225 Difference]: With dead ends: 130 [2020-08-18 19:37:27,397 INFO L226 Difference]: Without dead ends: 71 [2020-08-18 19:37:27,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-18 19:37:27,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-18 19:37:27,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-18 19:37:27,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-18 19:37:27,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-18 19:37:27,405 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-18 19:37:27,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:27,405 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-18 19:37:27,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 19:37:27,406 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-18 19:37:27,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 19:37:27,406 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:27,406 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:27,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 19:37:27,407 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:27,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:27,407 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-18 19:37:27,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:27,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1746233417] [2020-08-18 19:37:27,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:27,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:28,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:28,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:28,209 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:28,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1746233417] [2020-08-18 19:37:28,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:28,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 19:37:28,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087514105] [2020-08-18 19:37:28,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 19:37:28,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:28,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 19:37:28,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-18 19:37:28,211 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-18 19:37:29,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:29,511 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-18 19:37:29,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 19:37:29,515 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-18 19:37:29,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:29,516 INFO L225 Difference]: With dead ends: 134 [2020-08-18 19:37:29,516 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 19:37:29,517 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-18 19:37:29,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 19:37:29,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-18 19:37:29,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 19:37:29,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-18 19:37:29,523 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-18 19:37:29,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:29,523 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-18 19:37:29,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 19:37:29,523 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-18 19:37:29,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 19:37:29,524 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:29,524 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:29,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 19:37:29,524 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:29,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:29,525 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-18 19:37:29,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:29,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1182476860] [2020-08-18 19:37:29,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:29,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:30,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:30,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:30,344 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:30,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1182476860] [2020-08-18 19:37:30,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:30,344 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 19:37:30,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63421316] [2020-08-18 19:37:30,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 19:37:30,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:30,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 19:37:30,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-18 19:37:30,346 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-18 19:37:31,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:31,742 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-18 19:37:31,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 19:37:31,749 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-18 19:37:31,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:31,750 INFO L225 Difference]: With dead ends: 138 [2020-08-18 19:37:31,750 INFO L226 Difference]: Without dead ends: 75 [2020-08-18 19:37:31,751 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-18 19:37:31,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-18 19:37:31,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-18 19:37:31,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-18 19:37:31,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-18 19:37:31,756 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-18 19:37:31,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:31,756 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-18 19:37:31,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 19:37:31,756 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-18 19:37:31,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-18 19:37:31,757 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:31,757 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:31,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 19:37:31,757 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:31,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:31,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-18 19:37:31,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:31,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1790073857] [2020-08-18 19:37:31,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:31,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:32,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:32,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:32,649 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:32,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1790073857] [2020-08-18 19:37:32,650 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:32,650 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 19:37:32,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052334722] [2020-08-18 19:37:32,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 19:37:32,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:32,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 19:37:32,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-18 19:37:32,653 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-18 19:37:34,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:34,766 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-18 19:37:34,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 19:37:34,770 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-18 19:37:34,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:34,771 INFO L225 Difference]: With dead ends: 142 [2020-08-18 19:37:34,771 INFO L226 Difference]: Without dead ends: 77 [2020-08-18 19:37:34,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 19:37:34,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-18 19:37:34,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-18 19:37:34,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-18 19:37:34,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-18 19:37:34,778 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-18 19:37:34,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:34,779 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-18 19:37:34,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 19:37:34,779 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-18 19:37:34,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 19:37:34,782 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:34,782 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:34,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 19:37:34,782 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:34,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:34,783 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-18 19:37:34,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:34,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1859163264] [2020-08-18 19:37:34,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:34,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:35,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:35,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:35,773 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:35,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1859163264] [2020-08-18 19:37:35,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:35,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 19:37:35,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708930897] [2020-08-18 19:37:35,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 19:37:35,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:35,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 19:37:35,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 19:37:35,777 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-18 19:37:37,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:37,665 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-18 19:37:37,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 19:37:37,670 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-18 19:37:37,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:37,671 INFO L225 Difference]: With dead ends: 146 [2020-08-18 19:37:37,671 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 19:37:37,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 19:37:37,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 19:37:37,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-18 19:37:37,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 19:37:37,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-18 19:37:37,677 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-18 19:37:37,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:37,677 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-18 19:37:37,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 19:37:37,678 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-18 19:37:37,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 19:37:37,678 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:37,679 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:37,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 19:37:37,679 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:37,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:37,679 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-18 19:37:37,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:37,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74284128] [2020-08-18 19:37:37,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:37,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:38,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:38,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:38,656 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:38,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74284128] [2020-08-18 19:37:38,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:38,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 19:37:38,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004220270] [2020-08-18 19:37:38,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 19:37:38,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:38,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 19:37:38,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 19:37:38,659 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-18 19:37:40,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:40,433 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-18 19:37:40,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 19:37:40,434 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-18 19:37:40,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:40,435 INFO L225 Difference]: With dead ends: 150 [2020-08-18 19:37:40,435 INFO L226 Difference]: Without dead ends: 81 [2020-08-18 19:37:40,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 19:37:40,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-18 19:37:40,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-18 19:37:40,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-18 19:37:40,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-18 19:37:40,442 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-18 19:37:40,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:40,443 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-18 19:37:40,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 19:37:40,443 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-18 19:37:40,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-18 19:37:40,444 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:40,444 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:40,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 19:37:40,444 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:40,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:40,444 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-18 19:37:40,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:40,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661204701] [2020-08-18 19:37:40,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:40,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:41,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:41,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:41,484 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:41,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661204701] [2020-08-18 19:37:41,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:41,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 19:37:41,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941538687] [2020-08-18 19:37:41,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 19:37:41,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:41,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 19:37:41,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 19:37:41,487 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-18 19:37:43,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:43,335 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-18 19:37:43,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 19:37:43,340 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-18 19:37:43,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:43,341 INFO L225 Difference]: With dead ends: 154 [2020-08-18 19:37:43,341 INFO L226 Difference]: Without dead ends: 83 [2020-08-18 19:37:43,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 19:37:43,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-18 19:37:43,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-18 19:37:43,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-18 19:37:43,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-18 19:37:43,348 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-18 19:37:43,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:43,348 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-18 19:37:43,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 19:37:43,348 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-18 19:37:43,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 19:37:43,349 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:43,349 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:43,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 19:37:43,349 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:43,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:43,349 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-18 19:37:43,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:43,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2128166430] [2020-08-18 19:37:43,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:43,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:44,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:44,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:44,435 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:44,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2128166430] [2020-08-18 19:37:44,436 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:44,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 19:37:44,436 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058182828] [2020-08-18 19:37:44,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 19:37:44,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:44,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 19:37:44,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 19:37:44,438 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-18 19:37:46,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:46,366 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-18 19:37:46,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 19:37:46,367 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-18 19:37:46,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:46,368 INFO L225 Difference]: With dead ends: 158 [2020-08-18 19:37:46,368 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 19:37:46,370 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 19:37:46,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 19:37:46,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-18 19:37:46,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 19:37:46,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-18 19:37:46,375 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-18 19:37:46,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:46,375 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-18 19:37:46,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 19:37:46,376 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-18 19:37:46,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 19:37:46,376 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:46,376 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:46,376 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 19:37:46,376 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:46,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:46,377 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-18 19:37:46,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:46,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [325779942] [2020-08-18 19:37:46,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:46,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:47,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:47,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:47,580 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:47,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [325779942] [2020-08-18 19:37:47,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:47,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 19:37:47,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327575444] [2020-08-18 19:37:47,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 19:37:47,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:47,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 19:37:47,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 19:37:47,582 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-18 19:37:49,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:49,554 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-18 19:37:49,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 19:37:49,558 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-18 19:37:49,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:49,559 INFO L225 Difference]: With dead ends: 162 [2020-08-18 19:37:49,559 INFO L226 Difference]: Without dead ends: 87 [2020-08-18 19:37:49,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 19:37:49,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-18 19:37:49,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-18 19:37:49,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-18 19:37:49,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-18 19:37:49,567 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-18 19:37:49,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:49,568 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-18 19:37:49,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 19:37:49,568 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-18 19:37:49,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-18 19:37:49,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:49,569 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:49,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 19:37:49,570 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:49,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:49,570 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-18 19:37:49,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:49,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1590970346] [2020-08-18 19:37:49,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:49,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:50,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:50,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:50,813 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:50,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1590970346] [2020-08-18 19:37:50,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:50,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 19:37:50,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761090274] [2020-08-18 19:37:50,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 19:37:50,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:50,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 19:37:50,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 19:37:50,815 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-18 19:37:52,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:52,998 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-18 19:37:53,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 19:37:53,000 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-18 19:37:53,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:53,001 INFO L225 Difference]: With dead ends: 166 [2020-08-18 19:37:53,001 INFO L226 Difference]: Without dead ends: 89 [2020-08-18 19:37:53,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 19:37:53,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-18 19:37:53,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-18 19:37:53,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-18 19:37:53,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-18 19:37:53,007 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-18 19:37:53,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:53,007 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-18 19:37:53,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 19:37:53,007 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-18 19:37:53,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-18 19:37:53,008 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:53,008 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:53,008 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 19:37:53,008 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:53,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:53,009 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-18 19:37:53,009 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:53,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289626176] [2020-08-18 19:37:53,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:53,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:54,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:54,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:54,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:54,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [289626176] [2020-08-18 19:37:54,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:54,322 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 19:37:54,322 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598561967] [2020-08-18 19:37:54,323 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 19:37:54,323 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:54,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 19:37:54,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 19:37:54,323 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-18 19:37:56,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:37:56,518 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-18 19:37:56,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 19:37:56,519 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-18 19:37:56,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:37:56,520 INFO L225 Difference]: With dead ends: 170 [2020-08-18 19:37:56,520 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 19:37:56,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 19:37:56,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 19:37:56,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-18 19:37:56,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 19:37:56,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-18 19:37:56,528 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-18 19:37:56,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:37:56,528 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-18 19:37:56,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 19:37:56,528 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-18 19:37:56,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 19:37:56,529 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:37:56,529 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:37:56,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 19:37:56,529 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:37:56,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:37:56,530 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-18 19:37:56,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:37:56,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [247992241] [2020-08-18 19:37:56,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:37:56,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:37:57,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:37:57,941 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:37:57,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [247992241] [2020-08-18 19:37:57,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:37:57,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 19:37:57,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103327977] [2020-08-18 19:37:57,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 19:37:57,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:37:57,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 19:37:57,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 19:37:57,943 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-18 19:38:00,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:38:00,296 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-18 19:38:00,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 19:38:00,297 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-18 19:38:00,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:38:00,299 INFO L225 Difference]: With dead ends: 174 [2020-08-18 19:38:00,299 INFO L226 Difference]: Without dead ends: 93 [2020-08-18 19:38:00,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 19:38:00,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-18 19:38:00,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-18 19:38:00,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-18 19:38:00,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-18 19:38:00,306 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-18 19:38:00,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:38:00,307 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-18 19:38:00,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 19:38:00,307 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-18 19:38:00,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-18 19:38:00,308 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:38:00,308 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:38:00,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 19:38:00,308 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:38:00,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:38:00,308 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-18 19:38:00,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:38:00,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259936890] [2020-08-18 19:38:00,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:38:00,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:01,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:38:01,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:38:01,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:38:01,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259936890] [2020-08-18 19:38:01,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:38:01,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 19:38:01,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082857358] [2020-08-18 19:38:01,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 19:38:01,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:38:01,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 19:38:01,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 19:38:01,778 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.