/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=SMALLEST -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 17:12:05,620 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 17:12:05,624 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 17:12:05,666 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 17:12:05,666 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 17:12:05,676 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 17:12:05,679 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 17:12:05,682 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 17:12:05,685 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 17:12:05,689 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 17:12:05,690 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 17:12:05,691 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 17:12:05,692 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:12:05,694 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:12:05,696 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:12:05,698 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:12:05,699 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:12:05,700 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:12:05,702 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:12:05,710 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:12:05,713 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:12:05,714 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:12:05,715 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:12:05,715 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:12:05,728 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 17:12:05,737 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:12:05,738 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:12:05,739 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:12:05,740 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 17:12:05,780 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:12:05,780 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:12:05,782 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:12:05,782 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:12:05,783 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:12:05,783 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:12:05,783 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:12:05,783 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:12:05,784 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:12:05,784 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:12:05,785 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:12:05,785 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:12:05,785 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:12:05,785 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:12:05,786 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:12:05,786 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:12:05,786 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:12:05,786 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:12:05,786 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:12:05,787 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:12:05,787 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:12:05,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:12:05,787 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:12:05,787 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:12:05,788 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:12:05,788 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:12:05,788 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:12:05,788 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:12:05,788 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:12:05,788 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=SMALLEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; [2020-08-18 17:12:06,117 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:12:06,137 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:12:06,142 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:12:06,144 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:12:06,144 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:12:06,145 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 17:12:06,206 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/052428d55/d0a95cea91e44c8d958583c642fa6c09/FLAGaf0b08693 [2020-08-18 17:12:06,616 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:12:06,617 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 17:12:06,623 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/052428d55/d0a95cea91e44c8d958583c642fa6c09/FLAGaf0b08693 [2020-08-18 17:12:07,042 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/052428d55/d0a95cea91e44c8d958583c642fa6c09 [2020-08-18 17:12:07,052 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:12:07,054 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:12:07,055 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:12:07,055 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:12:07,059 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:12:07,060 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:12:07" (1/1) ... [2020-08-18 17:12:07,063 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d098041 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:07, skipping insertion in model container [2020-08-18 17:12:07,063 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:12:07" (1/1) ... [2020-08-18 17:12:07,072 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:12:07,089 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:12:07,263 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:12:07,357 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:12:07,380 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:12:07,582 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:12:07,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:07 WrapperNode [2020-08-18 17:12:07,590 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:12:07,591 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:12:07,591 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:12:07,591 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:12:07,606 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:07" (1/1) ... [2020-08-18 17:12:07,608 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:07" (1/1) ... [2020-08-18 17:12:07,619 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:07" (1/1) ... [2020-08-18 17:12:07,620 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:07" (1/1) ... [2020-08-18 17:12:07,639 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:07" (1/1) ... [2020-08-18 17:12:07,647 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:07" (1/1) ... [2020-08-18 17:12:07,649 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:07" (1/1) ... [2020-08-18 17:12:07,656 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:12:07,656 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:12:07,656 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:12:07,656 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:12:07,657 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:07" (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 17:12:07,719 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:12:07,719 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:12:07,719 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:12:07,719 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:12:07,720 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:12:07,720 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 17:12:07,720 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 17:12:07,720 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:12:07,720 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 17:12:07,721 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-18 17:12:07,721 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:12:07,721 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 17:12:07,963 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:12:07,963 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 17:12:07,967 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:12:07 BoogieIcfgContainer [2020-08-18 17:12:07,967 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:12:07,968 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:12:07,969 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:12:07,972 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:12:07,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:12:07" (1/3) ... [2020-08-18 17:12:07,973 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@627f918b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:12:07, skipping insertion in model container [2020-08-18 17:12:07,973 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:12:07" (2/3) ... [2020-08-18 17:12:07,973 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@627f918b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:12:07, skipping insertion in model container [2020-08-18 17:12:07,974 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:12:07" (3/3) ... [2020-08-18 17:12:07,975 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-18 17:12:07,997 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:12:08,018 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:12:08,060 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:12:08,117 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:12:08,117 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:12:08,117 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:12:08,118 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:12:08,120 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:12:08,120 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:12:08,120 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:12:08,121 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:12:08,147 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-18 17:12:08,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 17:12:08,154 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:08,156 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:08,156 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:08,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:08,164 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-18 17:12:08,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:08,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1593223574] [2020-08-18 17:12:08,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:08,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:08,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:08,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:08,392 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 17:12:08,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1593223574] [2020-08-18 17:12:08,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:12:08,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 17:12:08,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806703128] [2020-08-18 17:12:08,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 17:12:08,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:08,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 17:12:08,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 17:12:08,420 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-18 17:12:08,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:08,506 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-18 17:12:08,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 17:12:08,508 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-18 17:12:08,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:08,519 INFO L225 Difference]: With dead ends: 42 [2020-08-18 17:12:08,519 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 17:12:08,523 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 17:12:08,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 17:12:08,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-18 17:12:08,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 17:12:08,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 17:12:08,564 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-18 17:12:08,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:08,565 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 17:12:08,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 17:12:08,565 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 17:12:08,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 17:12:08,566 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:08,566 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:08,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:12:08,567 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:08,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:08,567 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-18 17:12:08,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:08,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224039824] [2020-08-18 17:12:08,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:08,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:08,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:08,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:08,676 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 17:12:08,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224039824] [2020-08-18 17:12:08,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:12:08,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:12:08,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81467977] [2020-08-18 17:12:08,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:12:08,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:08,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:12:08,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:12:08,680 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-18 17:12:08,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:08,777 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-18 17:12:08,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:12:08,777 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-18 17:12:08,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:08,779 INFO L225 Difference]: With dead ends: 36 [2020-08-18 17:12:08,779 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 17:12:08,780 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 17:12:08,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 17:12:08,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-18 17:12:08,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 17:12:08,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 17:12:08,787 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-18 17:12:08,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:08,788 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 17:12:08,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:12:08,788 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 17:12:08,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 17:12:08,789 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:08,789 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:08,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:12:08,789 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:08,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:08,790 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-18 17:12:08,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:08,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [304634448] [2020-08-18 17:12:08,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:08,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:08,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:08,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:08,871 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 17:12:08,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [304634448] [2020-08-18 17:12:08,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:12:08,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:12:08,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232273462] [2020-08-18 17:12:08,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:12:08,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:08,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:12:08,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:12:08,873 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-18 17:12:08,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:08,976 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-18 17:12:08,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:12:08,977 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 17:12:08,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:08,978 INFO L225 Difference]: With dead ends: 40 [2020-08-18 17:12:08,978 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 17:12:08,979 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 17:12:08,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 17:12:08,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-18 17:12:08,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 17:12:08,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 17:12:08,986 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-18 17:12:08,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:08,986 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 17:12:08,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:12:08,987 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 17:12:08,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 17:12:08,987 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:08,988 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:12:08,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:12:08,988 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:08,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:08,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-18 17:12:08,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:08,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2003661407] [2020-08-18 17:12:08,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:09,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:09,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:09,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:09,085 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 17:12:09,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2003661407] [2020-08-18 17:12:09,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:12:09,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 17:12:09,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212249259] [2020-08-18 17:12:09,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 17:12:09,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:09,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 17:12:09,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 17:12:09,089 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-18 17:12:09,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:09,170 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-18 17:12:09,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:12:09,170 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-18 17:12:09,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:09,171 INFO L225 Difference]: With dead ends: 31 [2020-08-18 17:12:09,171 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 17:12:09,172 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 17:12:09,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 17:12:09,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-18 17:12:09,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 17:12:09,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 17:12:09,178 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-18 17:12:09,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:09,178 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 17:12:09,178 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 17:12:09,178 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 17:12:09,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 17:12:09,179 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:09,179 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 17:12:09,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:12:09,180 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:09,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:09,181 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-18 17:12:09,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:09,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1288449336] [2020-08-18 17:12:09,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:09,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:09,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:09,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:09,289 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 17:12:09,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1288449336] [2020-08-18 17:12:09,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:09,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 17:12:09,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429215817] [2020-08-18 17:12:09,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:12:09,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:09,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:12:09,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:12:09,292 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-18 17:12:09,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:09,374 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-18 17:12:09,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 17:12:09,375 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-18 17:12:09,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:09,376 INFO L225 Difference]: With dead ends: 34 [2020-08-18 17:12:09,376 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 17:12:09,377 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 17:12:09,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 17:12:09,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-18 17:12:09,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 17:12:09,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 17:12:09,383 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-18 17:12:09,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:09,384 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 17:12:09,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:12:09,384 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 17:12:09,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 17:12:09,385 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:09,385 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 17:12:09,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:12:09,386 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:09,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:09,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-18 17:12:09,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:09,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555156149] [2020-08-18 17:12:09,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:09,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:09,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:09,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:09,532 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 17:12:09,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555156149] [2020-08-18 17:12:09,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:09,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 17:12:09,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731884179] [2020-08-18 17:12:09,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:12:09,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:09,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:12:09,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:12:09,535 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-18 17:12:09,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:09,620 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-18 17:12:09,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 17:12:09,620 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 17:12:09,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:09,621 INFO L225 Difference]: With dead ends: 38 [2020-08-18 17:12:09,621 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 17:12:09,622 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 17:12:09,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 17:12:09,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-18 17:12:09,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 17:12:09,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-18 17:12:09,628 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-18 17:12:09,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:09,628 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-18 17:12:09,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:12:09,629 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-18 17:12:09,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 17:12:09,629 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:09,630 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 17:12:09,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:12:09,630 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:09,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:09,630 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-18 17:12:09,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:09,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370105648] [2020-08-18 17:12:09,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:09,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:09,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:09,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:09,780 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 17:12:09,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370105648] [2020-08-18 17:12:09,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:09,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 17:12:09,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200672732] [2020-08-18 17:12:09,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 17:12:09,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:09,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 17:12:09,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:12:09,785 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-18 17:12:09,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:09,902 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-18 17:12:09,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 17:12:09,903 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-18 17:12:09,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:09,904 INFO L225 Difference]: With dead ends: 42 [2020-08-18 17:12:09,904 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 17:12:09,905 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 17:12:09,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 17:12:09,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-18 17:12:09,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 17:12:09,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 17:12:09,916 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-18 17:12:09,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:09,916 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 17:12:09,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 17:12:09,916 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 17:12:09,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 17:12:09,920 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:09,921 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 17:12:09,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 17:12:09,921 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:09,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:09,922 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-18 17:12:09,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:09,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273385339] [2020-08-18 17:12:09,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:09,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:10,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:10,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:10,124 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 17:12:10,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273385339] [2020-08-18 17:12:10,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:10,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 17:12:10,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104794818] [2020-08-18 17:12:10,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 17:12:10,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:10,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 17:12:10,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:12:10,129 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-18 17:12:10,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:10,272 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-18 17:12:10,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 17:12:10,273 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-18 17:12:10,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:10,274 INFO L225 Difference]: With dead ends: 46 [2020-08-18 17:12:10,274 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 17:12:10,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:12:10,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 17:12:10,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-18 17:12:10,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 17:12:10,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-18 17:12:10,286 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-18 17:12:10,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:10,287 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-18 17:12:10,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 17:12:10,287 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-18 17:12:10,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 17:12:10,289 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:10,289 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 17:12:10,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 17:12:10,290 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:10,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:10,290 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-18 17:12:10,290 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:10,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437277572] [2020-08-18 17:12:10,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:10,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:10,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:10,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:10,508 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 17:12:10,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437277572] [2020-08-18 17:12:10,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:10,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 17:12:10,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683369601] [2020-08-18 17:12:10,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 17:12:10,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:10,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 17:12:10,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-18 17:12:10,511 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-18 17:12:10,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:10,678 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-18 17:12:10,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 17:12:10,679 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-18 17:12:10,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:10,679 INFO L225 Difference]: With dead ends: 50 [2020-08-18 17:12:10,680 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 17:12:10,680 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 17:12:10,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 17:12:10,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 17:12:10,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 17:12:10,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-18 17:12:10,693 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-18 17:12:10,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:10,693 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-18 17:12:10,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 17:12:10,693 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-18 17:12:10,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 17:12:10,695 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:10,695 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 17:12:10,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 17:12:10,697 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:10,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:10,697 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-18 17:12:10,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:10,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105857288] [2020-08-18 17:12:10,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:10,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:10,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:10,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:10,915 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 17:12:10,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105857288] [2020-08-18 17:12:10,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:10,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 17:12:10,916 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419962240] [2020-08-18 17:12:10,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 17:12:10,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:10,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 17:12:10,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:12:10,917 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-18 17:12:11,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:11,118 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-18 17:12:11,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 17:12:11,118 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 17:12:11,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:11,119 INFO L225 Difference]: With dead ends: 54 [2020-08-18 17:12:11,119 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 17:12:11,120 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 17:12:11,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 17:12:11,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-18 17:12:11,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 17:12:11,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-18 17:12:11,126 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-18 17:12:11,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:11,126 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-18 17:12:11,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 17:12:11,127 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-18 17:12:11,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 17:12:11,128 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:11,128 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 17:12:11,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 17:12:11,128 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:11,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:11,129 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-18 17:12:11,129 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:11,129 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [210737299] [2020-08-18 17:12:11,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:11,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:11,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:11,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:11,332 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 17:12:11,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [210737299] [2020-08-18 17:12:11,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:11,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 17:12:11,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348933871] [2020-08-18 17:12:11,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 17:12:11,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:11,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 17:12:11,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:12:11,335 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-18 17:12:11,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:11,548 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-18 17:12:11,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 17:12:11,554 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-18 17:12:11,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:11,555 INFO L225 Difference]: With dead ends: 58 [2020-08-18 17:12:11,555 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 17:12:11,556 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 17:12:11,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 17:12:11,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-18 17:12:11,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 17:12:11,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-18 17:12:11,567 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-18 17:12:11,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:11,568 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-18 17:12:11,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 17:12:11,568 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-18 17:12:11,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 17:12:11,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:11,570 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 17:12:11,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 17:12:11,570 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:11,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:11,570 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-18 17:12:11,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:11,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523160027] [2020-08-18 17:12:11,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:11,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:11,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:11,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:11,781 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 17:12:11,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523160027] [2020-08-18 17:12:11,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:11,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 17:12:11,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470786520] [2020-08-18 17:12:11,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 17:12:11,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:11,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 17:12:11,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 17:12:11,783 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-18 17:12:12,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:12,022 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-18 17:12:12,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 17:12:12,023 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-18 17:12:12,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:12,024 INFO L225 Difference]: With dead ends: 62 [2020-08-18 17:12:12,024 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 17:12:12,025 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 17:12:12,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 17:12:12,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-18 17:12:12,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 17:12:12,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-18 17:12:12,032 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-18 17:12:12,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:12,032 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-18 17:12:12,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 17:12:12,032 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-18 17:12:12,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 17:12:12,033 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:12,033 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 17:12:12,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 17:12:12,033 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:12,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:12,034 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-18 17:12:12,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:12,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239543930] [2020-08-18 17:12:12,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:12,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:12,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:12,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:12,253 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 17:12:12,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [239543930] [2020-08-18 17:12:12,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:12,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:12:12,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54670385] [2020-08-18 17:12:12,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:12:12,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:12,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:12:12,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:12:12,256 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-18 17:12:12,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:12,510 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-18 17:12:12,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 17:12:12,510 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-18 17:12:12,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:12,511 INFO L225 Difference]: With dead ends: 66 [2020-08-18 17:12:12,512 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 17:12:12,512 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 17:12:12,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 17:12:12,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-18 17:12:12,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 17:12:12,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-18 17:12:12,524 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-18 17:12:12,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:12,527 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-18 17:12:12,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:12:12,528 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-18 17:12:12,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 17:12:12,528 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:12,528 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 17:12:12,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 17:12:12,529 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:12,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:12,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-18 17:12:12,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:12,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077165932] [2020-08-18 17:12:12,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:12,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:12,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:12,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:12,816 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 17:12:12,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077165932] [2020-08-18 17:12:12,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:12,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 17:12:12,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173273218] [2020-08-18 17:12:12,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 17:12:12,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:12,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 17:12:12,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-18 17:12:12,820 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-18 17:12:13,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:13,146 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-18 17:12:13,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 17:12:13,146 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-18 17:12:13,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:13,147 INFO L225 Difference]: With dead ends: 70 [2020-08-18 17:12:13,147 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 17:12:13,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:12:13,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 17:12:13,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-18 17:12:13,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 17:12:13,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-18 17:12:13,160 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-18 17:12:13,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:13,160 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-18 17:12:13,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 17:12:13,160 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-18 17:12:13,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 17:12:13,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:13,162 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 17:12:13,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 17:12:13,162 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:13,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:13,163 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-18 17:12:13,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:13,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [685453276] [2020-08-18 17:12:13,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:13,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:13,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:13,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:13,478 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 17:12:13,478 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [685453276] [2020-08-18 17:12:13,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:13,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 17:12:13,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813611742] [2020-08-18 17:12:13,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 17:12:13,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:13,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 17:12:13,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-18 17:12:13,480 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-18 17:12:13,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:13,881 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-18 17:12:13,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 17:12:13,881 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 17:12:13,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:13,882 INFO L225 Difference]: With dead ends: 74 [2020-08-18 17:12:13,882 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 17:12:13,883 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 17:12:13,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 17:12:13,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-18 17:12:13,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 17:12:13,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-18 17:12:13,896 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-18 17:12:13,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:13,900 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-18 17:12:13,900 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 17:12:13,900 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-18 17:12:13,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 17:12:13,901 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:13,901 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 17:12:13,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 17:12:13,901 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:13,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:13,904 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-18 17:12:13,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:13,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209179283] [2020-08-18 17:12:13,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:13,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:14,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:14,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:14,217 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 17:12:14,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209179283] [2020-08-18 17:12:14,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:14,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 17:12:14,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847381714] [2020-08-18 17:12:14,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 17:12:14,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:14,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 17:12:14,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-18 17:12:14,220 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-18 17:12:14,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:14,600 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-18 17:12:14,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 17:12:14,600 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-18 17:12:14,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:14,601 INFO L225 Difference]: With dead ends: 78 [2020-08-18 17:12:14,602 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 17:12:14,603 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 17:12:14,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 17:12:14,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-18 17:12:14,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 17:12:14,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-18 17:12:14,608 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-18 17:12:14,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:14,609 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-18 17:12:14,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 17:12:14,609 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-18 17:12:14,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 17:12:14,610 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:14,610 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 17:12:14,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 17:12:14,610 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:14,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:14,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-18 17:12:14,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:14,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165761453] [2020-08-18 17:12:14,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:14,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:14,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:14,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:14,885 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 17:12:14,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165761453] [2020-08-18 17:12:14,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:14,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 17:12:14,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725135940] [2020-08-18 17:12:14,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 17:12:14,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:14,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 17:12:14,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-18 17:12:14,887 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-18 17:12:15,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:15,297 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-18 17:12:15,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 17:12:15,298 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-18 17:12:15,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:15,298 INFO L225 Difference]: With dead ends: 82 [2020-08-18 17:12:15,299 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 17:12:15,301 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 17:12:15,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 17:12:15,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-18 17:12:15,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 17:12:15,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-18 17:12:15,307 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-18 17:12:15,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:15,307 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-18 17:12:15,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 17:12:15,307 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-18 17:12:15,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 17:12:15,308 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:15,308 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 17:12:15,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 17:12:15,308 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:15,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:15,309 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-18 17:12:15,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:15,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [782597055] [2020-08-18 17:12:15,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:15,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:15,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:15,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:15,667 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 17:12:15,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [782597055] [2020-08-18 17:12:15,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:15,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 17:12:15,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635711250] [2020-08-18 17:12:15,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 17:12:15,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:15,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 17:12:15,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-18 17:12:15,677 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-18 17:12:16,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:16,188 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-18 17:12:16,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 17:12:16,189 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-18 17:12:16,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:16,190 INFO L225 Difference]: With dead ends: 86 [2020-08-18 17:12:16,190 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 17:12:16,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-18 17:12:16,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 17:12:16,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-18 17:12:16,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 17:12:16,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-18 17:12:16,197 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-18 17:12:16,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:16,197 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-18 17:12:16,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 17:12:16,197 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-18 17:12:16,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 17:12:16,198 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:16,198 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 17:12:16,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 17:12:16,199 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:16,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:16,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-18 17:12:16,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:16,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48137307] [2020-08-18 17:12:16,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:16,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:16,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:16,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:16,549 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 17:12:16,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48137307] [2020-08-18 17:12:16,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:16,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 17:12:16,550 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185093677] [2020-08-18 17:12:16,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 17:12:16,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:16,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 17:12:16,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-18 17:12:16,551 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-18 17:12:17,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:17,125 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-18 17:12:17,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 17:12:17,126 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-18 17:12:17,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:17,126 INFO L225 Difference]: With dead ends: 90 [2020-08-18 17:12:17,127 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 17:12:17,127 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 17:12:17,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 17:12:17,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-18 17:12:17,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 17:12:17,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-18 17:12:17,138 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-18 17:12:17,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:17,138 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-18 17:12:17,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 17:12:17,138 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-18 17:12:17,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 17:12:17,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:17,140 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 17:12:17,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 17:12:17,140 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:17,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:17,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-18 17:12:17,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:17,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524671383] [2020-08-18 17:12:17,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:17,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:17,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:17,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:17,546 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 17:12:17,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1524671383] [2020-08-18 17:12:17,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:17,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 17:12:17,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390460746] [2020-08-18 17:12:17,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 17:12:17,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:17,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 17:12:17,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-18 17:12:17,548 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-18 17:12:18,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:18,125 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-18 17:12:18,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 17:12:18,125 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-18 17:12:18,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:18,126 INFO L225 Difference]: With dead ends: 94 [2020-08-18 17:12:18,126 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 17:12:18,127 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 17:12:18,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 17:12:18,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-18 17:12:18,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 17:12:18,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-18 17:12:18,132 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-18 17:12:18,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:18,132 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-18 17:12:18,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 17:12:18,132 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-18 17:12:18,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 17:12:18,133 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:18,133 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 17:12:18,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 17:12:18,134 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:18,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:18,134 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-18 17:12:18,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:18,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526449029] [2020-08-18 17:12:18,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:18,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:18,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:18,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:18,538 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 17:12:18,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1526449029] [2020-08-18 17:12:18,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:18,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 17:12:18,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546318195] [2020-08-18 17:12:18,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 17:12:18,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:18,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 17:12:18,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-18 17:12:18,540 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-18 17:12:19,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:19,195 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-18 17:12:19,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 17:12:19,196 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-18 17:12:19,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:19,197 INFO L225 Difference]: With dead ends: 98 [2020-08-18 17:12:19,197 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 17:12:19,198 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 17:12:19,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 17:12:19,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-18 17:12:19,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 17:12:19,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-18 17:12:19,203 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-18 17:12:19,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:19,204 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-18 17:12:19,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 17:12:19,204 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-18 17:12:19,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 17:12:19,204 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:19,205 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 17:12:19,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 17:12:19,205 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:19,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:19,206 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-18 17:12:19,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:19,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1549698527] [2020-08-18 17:12:19,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:19,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:19,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:19,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:19,676 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 17:12:19,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1549698527] [2020-08-18 17:12:19,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:19,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 17:12:19,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790580163] [2020-08-18 17:12:19,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 17:12:19,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:19,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 17:12:19,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-18 17:12:19,679 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-18 17:12:20,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:20,342 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-18 17:12:20,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 17:12:20,344 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-18 17:12:20,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:20,345 INFO L225 Difference]: With dead ends: 102 [2020-08-18 17:12:20,345 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 17:12:20,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-18 17:12:20,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 17:12:20,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-18 17:12:20,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 17:12:20,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-18 17:12:20,355 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-18 17:12:20,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:20,355 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-18 17:12:20,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 17:12:20,356 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-18 17:12:20,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 17:12:20,356 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:20,356 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 17:12:20,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 17:12:20,357 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:20,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:20,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-18 17:12:20,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:20,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1977897385] [2020-08-18 17:12:20,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:20,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:20,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:20,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:20,832 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 17:12:20,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1977897385] [2020-08-18 17:12:20,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:20,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 17:12:20,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779871105] [2020-08-18 17:12:20,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 17:12:20,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:20,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 17:12:20,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-18 17:12:20,834 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-18 17:12:21,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:21,573 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-18 17:12:21,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 17:12:21,578 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-18 17:12:21,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:21,579 INFO L225 Difference]: With dead ends: 106 [2020-08-18 17:12:21,579 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 17:12:21,582 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 17:12:21,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 17:12:21,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-18 17:12:21,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 17:12:21,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-18 17:12:21,588 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-18 17:12:21,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:21,588 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-18 17:12:21,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 17:12:21,589 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-18 17:12:21,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 17:12:21,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:21,589 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 17:12:21,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 17:12:21,590 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:21,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:21,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-18 17:12:21,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:21,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [582309725] [2020-08-18 17:12:21,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:21,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:22,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:22,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:22,154 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 17:12:22,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [582309725] [2020-08-18 17:12:22,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:22,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 17:12:22,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829769846] [2020-08-18 17:12:22,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 17:12:22,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:22,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 17:12:22,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-18 17:12:22,156 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-18 17:12:23,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:23,073 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-18 17:12:23,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 17:12:23,073 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-18 17:12:23,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:23,074 INFO L225 Difference]: With dead ends: 110 [2020-08-18 17:12:23,074 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 17:12:23,075 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 17:12:23,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 17:12:23,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-18 17:12:23,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 17:12:23,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-18 17:12:23,080 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-18 17:12:23,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:23,080 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-18 17:12:23,081 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 17:12:23,081 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-18 17:12:23,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 17:12:23,081 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:23,081 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 17:12:23,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 17:12:23,082 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:23,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:23,082 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-18 17:12:23,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:23,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53567584] [2020-08-18 17:12:23,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:23,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:23,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:23,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:23,641 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 17:12:23,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53567584] [2020-08-18 17:12:23,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:23,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 17:12:23,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031529812] [2020-08-18 17:12:23,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 17:12:23,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:23,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 17:12:23,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-18 17:12:23,643 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-18 17:12:24,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:24,561 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-18 17:12:24,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 17:12:24,561 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-18 17:12:24,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:24,562 INFO L225 Difference]: With dead ends: 114 [2020-08-18 17:12:24,562 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 17:12:24,563 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 17:12:24,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 17:12:24,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-18 17:12:24,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-18 17:12:24,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-18 17:12:24,568 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-18 17:12:24,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:24,568 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-18 17:12:24,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 17:12:24,568 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-18 17:12:24,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-18 17:12:24,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:24,569 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 17:12:24,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 17:12:24,569 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:24,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:24,569 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-18 17:12:24,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:24,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [926592247] [2020-08-18 17:12:24,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:24,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:25,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:25,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:25,129 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 17:12:25,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [926592247] [2020-08-18 17:12:25,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:25,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 17:12:25,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965153423] [2020-08-18 17:12:25,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 17:12:25,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:25,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 17:12:25,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-18 17:12:25,131 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-18 17:12:26,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:26,050 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-18 17:12:26,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 17:12:26,052 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-18 17:12:26,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:26,052 INFO L225 Difference]: With dead ends: 118 [2020-08-18 17:12:26,053 INFO L226 Difference]: Without dead ends: 65 [2020-08-18 17:12:26,054 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 17:12:26,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-18 17:12:26,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-18 17:12:26,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-18 17:12:26,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-18 17:12:26,059 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-18 17:12:26,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:26,059 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-18 17:12:26,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 17:12:26,059 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-18 17:12:26,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 17:12:26,060 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:26,060 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 17:12:26,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 17:12:26,061 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:26,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:26,061 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-18 17:12:26,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:26,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126819522] [2020-08-18 17:12:26,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:26,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:26,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:26,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:26,741 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 17:12:26,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126819522] [2020-08-18 17:12:26,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:26,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 17:12:26,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431910564] [2020-08-18 17:12:26,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 17:12:26,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:26,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 17:12:26,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-18 17:12:26,744 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-18 17:12:27,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:27,816 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-18 17:12:27,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 17:12:27,820 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-18 17:12:27,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:27,820 INFO L225 Difference]: With dead ends: 122 [2020-08-18 17:12:27,821 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 17:12:27,821 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 17:12:27,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 17:12:27,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-18 17:12:27,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 17:12:27,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-18 17:12:27,825 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-18 17:12:27,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:27,826 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-18 17:12:27,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 17:12:27,826 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-18 17:12:27,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 17:12:27,826 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:27,827 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 17:12:27,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 17:12:27,827 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:27,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:27,827 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-18 17:12:27,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:27,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1273011296] [2020-08-18 17:12:27,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:27,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:28,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:28,506 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 17:12:28,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1273011296] [2020-08-18 17:12:28,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:28,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 17:12:28,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261029896] [2020-08-18 17:12:28,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 17:12:28,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:28,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 17:12:28,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-18 17:12:28,508 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-18 17:12:29,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:29,670 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-18 17:12:29,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 17:12:29,673 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-18 17:12:29,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:29,673 INFO L225 Difference]: With dead ends: 126 [2020-08-18 17:12:29,673 INFO L226 Difference]: Without dead ends: 69 [2020-08-18 17:12:29,674 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 17:12:29,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-18 17:12:29,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-18 17:12:29,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 17:12:29,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-18 17:12:29,678 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-18 17:12:29,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:29,679 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-18 17:12:29,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 17:12:29,679 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-18 17:12:29,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-18 17:12:29,679 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:29,679 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 17:12:29,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 17:12:29,679 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:29,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:29,680 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-18 17:12:29,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:29,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1994796812] [2020-08-18 17:12:29,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:29,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:30,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:30,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:30,391 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 17:12:30,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1994796812] [2020-08-18 17:12:30,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:30,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 17:12:30,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716780654] [2020-08-18 17:12:30,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 17:12:30,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:30,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 17:12:30,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-18 17:12:30,393 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-18 17:12:31,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:31,605 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-18 17:12:31,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 17:12:31,608 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-18 17:12:31,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:31,609 INFO L225 Difference]: With dead ends: 130 [2020-08-18 17:12:31,609 INFO L226 Difference]: Without dead ends: 71 [2020-08-18 17:12:31,610 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 17:12:31,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-18 17:12:31,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-18 17:12:31,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-18 17:12:31,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-18 17:12:31,619 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-18 17:12:31,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:31,619 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-18 17:12:31,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 17:12:31,619 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-18 17:12:31,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 17:12:31,620 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:31,620 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 17:12:31,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 17:12:31,620 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:31,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:31,621 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-18 17:12:31,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:31,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415814280] [2020-08-18 17:12:31,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:31,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:32,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:32,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:32,413 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 17:12:32,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415814280] [2020-08-18 17:12:32,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:32,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 17:12:32,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596167945] [2020-08-18 17:12:32,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 17:12:32,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:32,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 17:12:32,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-18 17:12:32,416 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-18 17:12:33,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:33,752 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-18 17:12:33,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 17:12:33,754 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-18 17:12:33,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:33,756 INFO L225 Difference]: With dead ends: 134 [2020-08-18 17:12:33,756 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 17:12:33,757 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 17:12:33,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 17:12:33,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-18 17:12:33,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 17:12:33,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-18 17:12:33,765 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-18 17:12:33,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:33,765 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-18 17:12:33,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 17:12:33,766 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-18 17:12:33,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 17:12:33,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:33,766 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 17:12:33,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 17:12:33,767 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:33,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:33,768 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-18 17:12:33,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:33,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646829703] [2020-08-18 17:12:33,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:33,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:34,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:34,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:34,642 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 17:12:34,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646829703] [2020-08-18 17:12:34,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:34,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 17:12:34,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233390707] [2020-08-18 17:12:34,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 17:12:34,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:34,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 17:12:34,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-18 17:12:34,644 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-18 17:12:36,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:36,030 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-18 17:12:36,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 17:12:36,030 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-18 17:12:36,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:36,031 INFO L225 Difference]: With dead ends: 138 [2020-08-18 17:12:36,031 INFO L226 Difference]: Without dead ends: 75 [2020-08-18 17:12:36,032 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 17:12:36,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-18 17:12:36,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-18 17:12:36,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-18 17:12:36,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-18 17:12:36,038 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-18 17:12:36,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:36,039 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-18 17:12:36,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 17:12:36,039 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-18 17:12:36,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-18 17:12:36,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:36,039 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 17:12:36,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 17:12:36,040 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:36,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:36,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-18 17:12:36,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:36,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [662276441] [2020-08-18 17:12:36,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:36,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:36,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:36,899 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 17:12:36,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [662276441] [2020-08-18 17:12:36,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:36,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 17:12:36,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117497471] [2020-08-18 17:12:36,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 17:12:36,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:36,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 17:12:36,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-18 17:12:36,901 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-18 17:12:38,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:38,464 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-18 17:12:38,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 17:12:38,465 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-18 17:12:38,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:38,466 INFO L225 Difference]: With dead ends: 142 [2020-08-18 17:12:38,466 INFO L226 Difference]: Without dead ends: 77 [2020-08-18 17:12:38,468 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 17:12:38,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-18 17:12:38,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-18 17:12:38,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-18 17:12:38,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-18 17:12:38,474 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-18 17:12:38,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:38,474 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-18 17:12:38,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 17:12:38,475 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-18 17:12:38,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 17:12:38,475 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:38,475 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 17:12:38,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 17:12:38,476 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:38,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:38,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-18 17:12:38,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:38,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761434477] [2020-08-18 17:12:38,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:38,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:39,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:39,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:39,701 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 17:12:39,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761434477] [2020-08-18 17:12:39,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:39,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 17:12:39,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492612771] [2020-08-18 17:12:39,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 17:12:39,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:39,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 17:12:39,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 17:12:39,704 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-18 17:12:41,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:41,406 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-18 17:12:41,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 17:12:41,411 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-18 17:12:41,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:41,412 INFO L225 Difference]: With dead ends: 146 [2020-08-18 17:12:41,412 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 17:12:41,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 17:12:41,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 17:12:41,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-18 17:12:41,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 17:12:41,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-18 17:12:41,420 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-18 17:12:41,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:41,420 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-18 17:12:41,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 17:12:41,420 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-18 17:12:41,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 17:12:41,421 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:41,421 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 17:12:41,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 17:12:41,422 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:41,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:41,422 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-18 17:12:41,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:41,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [40371036] [2020-08-18 17:12:41,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:41,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:42,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:42,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:42,467 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 17:12:42,467 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [40371036] [2020-08-18 17:12:42,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:42,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 17:12:42,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034162564] [2020-08-18 17:12:42,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 17:12:42,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:42,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 17:12:42,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 17:12:42,475 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-18 17:12:44,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:44,224 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-18 17:12:44,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 17:12:44,224 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-18 17:12:44,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:44,225 INFO L225 Difference]: With dead ends: 150 [2020-08-18 17:12:44,225 INFO L226 Difference]: Without dead ends: 81 [2020-08-18 17:12:44,226 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 17:12:44,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-18 17:12:44,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-18 17:12:44,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-18 17:12:44,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-18 17:12:44,232 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-18 17:12:44,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:44,232 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-18 17:12:44,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 17:12:44,233 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-18 17:12:44,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-18 17:12:44,233 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:44,233 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 17:12:44,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 17:12:44,234 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:44,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:44,234 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-18 17:12:44,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:44,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952567731] [2020-08-18 17:12:44,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:44,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:45,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:45,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:45,286 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 17:12:45,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952567731] [2020-08-18 17:12:45,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:45,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 17:12:45,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978900795] [2020-08-18 17:12:45,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 17:12:45,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:45,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 17:12:45,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 17:12:45,289 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-18 17:12:47,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:47,133 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-18 17:12:47,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 17:12:47,135 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-18 17:12:47,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:47,136 INFO L225 Difference]: With dead ends: 154 [2020-08-18 17:12:47,136 INFO L226 Difference]: Without dead ends: 83 [2020-08-18 17:12:47,137 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 17:12:47,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-18 17:12:47,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-18 17:12:47,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-18 17:12:47,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-18 17:12:47,143 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-18 17:12:47,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:47,143 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-18 17:12:47,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 17:12:47,143 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-18 17:12:47,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 17:12:47,144 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:47,144 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 17:12:47,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 17:12:47,144 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:47,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:47,144 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-18 17:12:47,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:47,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [73195084] [2020-08-18 17:12:47,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:47,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:48,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:48,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:48,251 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 17:12:48,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [73195084] [2020-08-18 17:12:48,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:48,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 17:12:48,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631070409] [2020-08-18 17:12:48,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 17:12:48,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:48,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 17:12:48,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 17:12:48,253 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-18 17:12:50,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:50,197 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-18 17:12:50,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 17:12:50,198 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-18 17:12:50,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:50,199 INFO L225 Difference]: With dead ends: 158 [2020-08-18 17:12:50,199 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 17:12:50,199 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 17:12:50,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 17:12:50,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-18 17:12:50,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 17:12:50,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-18 17:12:50,205 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-18 17:12:50,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:50,206 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-18 17:12:50,206 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 17:12:50,206 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-18 17:12:50,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 17:12:50,207 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:50,207 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 17:12:50,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 17:12:50,207 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:50,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:50,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-18 17:12:50,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:50,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1083734886] [2020-08-18 17:12:50,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:50,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:51,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:51,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:51,367 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 17:12:51,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1083734886] [2020-08-18 17:12:51,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:51,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 17:12:51,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219974804] [2020-08-18 17:12:51,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 17:12:51,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:51,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 17:12:51,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 17:12:51,369 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-18 17:12:53,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:53,359 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-18 17:12:53,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 17:12:53,360 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-18 17:12:53,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:53,361 INFO L225 Difference]: With dead ends: 162 [2020-08-18 17:12:53,361 INFO L226 Difference]: Without dead ends: 87 [2020-08-18 17:12:53,362 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 17:12:53,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-18 17:12:53,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-18 17:12:53,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-18 17:12:53,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-18 17:12:53,368 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-18 17:12:53,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:53,368 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-18 17:12:53,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 17:12:53,368 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-18 17:12:53,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-18 17:12:53,369 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:53,369 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 17:12:53,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 17:12:53,370 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:53,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:53,370 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-18 17:12:53,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:53,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530426652] [2020-08-18 17:12:53,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:53,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:54,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:54,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:54,610 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 17:12:54,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530426652] [2020-08-18 17:12:54,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:54,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 17:12:54,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092230538] [2020-08-18 17:12:54,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 17:12:54,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:54,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 17:12:54,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 17:12:54,613 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-18 17:12:56,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:12:56,837 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-18 17:12:56,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 17:12:56,839 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-18 17:12:56,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:12:56,840 INFO L225 Difference]: With dead ends: 166 [2020-08-18 17:12:56,840 INFO L226 Difference]: Without dead ends: 89 [2020-08-18 17:12:56,841 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 17:12:56,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-18 17:12:56,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-18 17:12:56,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-18 17:12:56,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-18 17:12:56,847 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-18 17:12:56,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:12:56,847 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-18 17:12:56,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 17:12:56,847 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-18 17:12:56,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-18 17:12:56,848 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:12:56,848 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 17:12:56,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 17:12:56,849 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:12:56,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:12:56,849 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-18 17:12:56,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:12:56,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1966657897] [2020-08-18 17:12:56,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:12:56,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:12:58,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:12:58,188 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 17:12:58,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1966657897] [2020-08-18 17:12:58,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:12:58,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 17:12:58,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225475840] [2020-08-18 17:12:58,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 17:12:58,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:12:58,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 17:12:58,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 17:12:58,190 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-18 17:13:00,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:00,429 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-18 17:13:00,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 17:13:00,430 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-18 17:13:00,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:00,431 INFO L225 Difference]: With dead ends: 170 [2020-08-18 17:13:00,431 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 17:13:00,432 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 17:13:00,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 17:13:00,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-18 17:13:00,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 17:13:00,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-18 17:13:00,443 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-18 17:13:00,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:00,443 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-18 17:13:00,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 17:13:00,444 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-18 17:13:00,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 17:13:00,445 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:00,445 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 17:13:00,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 17:13:00,445 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:00,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:00,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-18 17:13:00,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:00,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595033457] [2020-08-18 17:13:00,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:00,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:01,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:01,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:01,878 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 17:13:01,879 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595033457] [2020-08-18 17:13:01,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:01,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 17:13:01,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181775490] [2020-08-18 17:13:01,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 17:13:01,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:01,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 17:13:01,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 17:13:01,881 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-18 17:13:04,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:13:04,226 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-18 17:13:04,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 17:13:04,227 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-18 17:13:04,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:13:04,228 INFO L225 Difference]: With dead ends: 174 [2020-08-18 17:13:04,228 INFO L226 Difference]: Without dead ends: 93 [2020-08-18 17:13:04,229 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 17:13:04,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-18 17:13:04,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-18 17:13:04,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-18 17:13:04,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-18 17:13:04,237 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-18 17:13:04,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:13:04,237 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-18 17:13:04,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 17:13:04,237 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-18 17:13:04,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-18 17:13:04,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:13:04,240 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 17:13:04,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 17:13:04,240 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:13:04,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:13:04,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-18 17:13:04,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:13:04,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1670403677] [2020-08-18 17:13:04,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:13:04,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:05,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:13:05,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:13:05,720 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 17:13:05,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1670403677] [2020-08-18 17:13:05,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:13:05,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 17:13:05,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348533066] [2020-08-18 17:13:05,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 17:13:05,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:13:05,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 17:13:05,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 17:13:05,721 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.