/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.8 -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 [2020-08-19 02:04:53,613 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 02:04:53,615 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 02:04:53,642 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 02:04:53,642 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 02:04:53,643 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 02:04:53,644 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 02:04:53,646 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 02:04:53,648 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 02:04:53,648 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 02:04:53,649 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 02:04:53,650 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 02:04:53,651 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 02:04:53,652 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 02:04:53,653 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 02:04:53,654 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 02:04:53,654 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 02:04:53,655 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 02:04:53,656 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 02:04:53,658 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 02:04:53,659 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 02:04:53,660 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 02:04:53,661 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 02:04:53,662 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 02:04:53,664 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 02:04:53,671 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 02:04:53,672 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 02:04:53,673 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 02:04:53,674 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 [2020-08-19 02:04:53,695 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 02:04:53,696 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 02:04:53,697 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 02:04:53,697 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 02:04:53,697 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 02:04:53,698 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 02:04:53,698 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 02:04:53,698 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 02:04:53,698 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 02:04:53,698 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 02:04:53,699 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 02:04:53,699 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 02:04:53,699 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 02:04:53,699 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 02:04:53,699 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 02:04:53,700 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 02:04:53,700 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 02:04:53,700 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 02:04:53,700 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 02:04:53,700 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 02:04:53,701 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 02:04:53,701 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:04:53,701 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 02:04:53,701 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 02:04:53,701 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 02:04:53,702 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 02:04:53,702 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 02:04:53,702 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 02:04:53,702 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 02:04:53,702 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=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8; [2020-08-19 02:04:54,029 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 02:04:54,051 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 02:04:54,058 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 02:04:54,060 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 02:04:54,060 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 02:04:54,061 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-19 02:04:54,126 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2be77600b/be756bb8e0f94edb8f843cbb7d14af08/FLAG7ff3b8a37 [2020-08-19 02:04:54,581 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 02:04:54,582 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-19 02:04:54,587 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2be77600b/be756bb8e0f94edb8f843cbb7d14af08/FLAG7ff3b8a37 [2020-08-19 02:04:54,917 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2be77600b/be756bb8e0f94edb8f843cbb7d14af08 [2020-08-19 02:04:54,925 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 02:04:54,927 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 02:04:54,928 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 02:04:54,928 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 02:04:54,932 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 02:04:54,933 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:04:54" (1/1) ... [2020-08-19 02:04:54,936 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63f67a49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:54, skipping insertion in model container [2020-08-19 02:04:54,936 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:04:54" (1/1) ... [2020-08-19 02:04:54,944 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 02:04:54,965 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 02:04:55,160 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:04:55,203 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 02:04:55,222 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:04:55,376 INFO L208 MainTranslator]: Completed translation [2020-08-19 02:04:55,377 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:55 WrapperNode [2020-08-19 02:04:55,377 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 02:04:55,378 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 02:04:55,378 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 02:04:55,378 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 02:04:55,390 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:55" (1/1) ... [2020-08-19 02:04:55,390 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:55" (1/1) ... [2020-08-19 02:04:55,398 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:55" (1/1) ... [2020-08-19 02:04:55,398 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:55" (1/1) ... [2020-08-19 02:04:55,405 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:55" (1/1) ... [2020-08-19 02:04:55,411 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:55" (1/1) ... [2020-08-19 02:04:55,414 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:55" (1/1) ... [2020-08-19 02:04:55,417 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 02:04:55,417 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 02:04:55,417 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 02:04:55,417 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 02:04:55,418 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:55" (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 [2020-08-19 02:04:55,471 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 02:04:55,471 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 02:04:55,472 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 02:04:55,472 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 02:04:55,472 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 02:04:55,472 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-19 02:04:55,473 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-19 02:04:55,473 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 02:04:55,473 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 02:04:55,474 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-19 02:04:55,474 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 02:04:55,475 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 02:04:55,710 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 02:04:55,710 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 02:04:55,714 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:04:55 BoogieIcfgContainer [2020-08-19 02:04:55,714 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 02:04:55,716 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 02:04:55,716 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 02:04:55,719 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 02:04:55,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 02:04:54" (1/3) ... [2020-08-19 02:04:55,720 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3817f6a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:04:55, skipping insertion in model container [2020-08-19 02:04:55,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:04:55" (2/3) ... [2020-08-19 02:04:55,721 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3817f6a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:04:55, skipping insertion in model container [2020-08-19 02:04:55,721 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:04:55" (3/3) ... [2020-08-19 02:04:55,723 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-19 02:04:55,733 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 02:04:55,741 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 02:04:55,757 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 02:04:55,791 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 02:04:55,791 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 02:04:55,791 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 02:04:55,791 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 02:04:55,791 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 02:04:55,792 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 02:04:55,792 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 02:04:55,792 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 02:04:55,814 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-19 02:04:55,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-19 02:04:55,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:55,821 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:55,822 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:55,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:55,830 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-19 02:04:55,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:55,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1185313589] [2020-08-19 02:04:55,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:55,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:56,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:56,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:56,057 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:56,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1185313589] [2020-08-19 02:04:56,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:04:56,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 02:04:56,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055578907] [2020-08-19 02:04:56,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 02:04:56,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:56,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 02:04:56,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 02:04:56,085 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-19 02:04:56,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:56,181 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-19 02:04:56,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:04:56,183 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-19 02:04:56,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:56,193 INFO L225 Difference]: With dead ends: 42 [2020-08-19 02:04:56,194 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 02:04:56,198 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 [2020-08-19 02:04:56,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 02:04:56,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-19 02:04:56,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 02:04:56,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 02:04:56,239 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-19 02:04:56,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:56,240 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 02:04:56,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 02:04:56,240 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 02:04:56,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-19 02:04:56,241 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:56,241 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:56,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 02:04:56,242 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:56,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:56,243 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-19 02:04:56,243 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:56,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [193348247] [2020-08-19 02:04:56,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:56,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:56,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:56,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:56,364 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:56,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [193348247] [2020-08-19 02:04:56,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:04:56,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 02:04:56,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190856330] [2020-08-19 02:04:56,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:04:56,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:56,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:04:56,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:04:56,372 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-19 02:04:56,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:56,509 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-19 02:04:56,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:04:56,510 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-19 02:04:56,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:56,511 INFO L225 Difference]: With dead ends: 36 [2020-08-19 02:04:56,511 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 02:04:56,512 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 [2020-08-19 02:04:56,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 02:04:56,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-19 02:04:56,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 02:04:56,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-19 02:04:56,520 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-19 02:04:56,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:56,520 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-19 02:04:56,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:04:56,521 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-19 02:04:56,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 02:04:56,521 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:56,522 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:56,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 02:04:56,522 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:56,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:56,523 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-19 02:04:56,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:56,523 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689581555] [2020-08-19 02:04:56,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:56,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:56,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:56,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:56,602 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:56,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689581555] [2020-08-19 02:04:56,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:04:56,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 02:04:56,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008018515] [2020-08-19 02:04:56,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:04:56,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:56,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:04:56,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:04:56,604 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-19 02:04:56,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:56,713 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-19 02:04:56,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:04:56,713 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-19 02:04:56,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:56,715 INFO L225 Difference]: With dead ends: 40 [2020-08-19 02:04:56,715 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 02:04:56,716 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 [2020-08-19 02:04:56,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 02:04:56,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-19 02:04:56,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 02:04:56,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-19 02:04:56,723 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-19 02:04:56,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:56,723 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-19 02:04:56,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:04:56,724 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-19 02:04:56,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 02:04:56,725 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:56,725 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:56,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 02:04:56,726 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:56,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:56,726 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-19 02:04:56,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:56,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484239099] [2020-08-19 02:04:56,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:56,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:56,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:56,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:56,821 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:56,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484239099] [2020-08-19 02:04:56,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:04:56,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 02:04:56,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822230451] [2020-08-19 02:04:56,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:04:56,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:56,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:04:56,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:04:56,827 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-19 02:04:56,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:56,921 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-19 02:04:56,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:04:56,921 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-19 02:04:56,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:56,922 INFO L225 Difference]: With dead ends: 31 [2020-08-19 02:04:56,922 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 02:04:56,923 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 [2020-08-19 02:04:56,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 02:04:56,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-19 02:04:56,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 02:04:56,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-19 02:04:56,929 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-19 02:04:56,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:56,930 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-19 02:04:56,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:04:56,930 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-19 02:04:56,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 02:04:56,931 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:56,931 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:56,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 02:04:56,932 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:56,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:56,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-19 02:04:56,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:56,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460318845] [2020-08-19 02:04:56,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:56,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:57,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:57,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:57,050 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:57,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460318845] [2020-08-19 02:04:57,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:57,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 02:04:57,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159966041] [2020-08-19 02:04:57,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:04:57,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:57,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:04:57,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:04:57,053 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-19 02:04:57,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:57,134 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-19 02:04:57,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 02:04:57,134 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-19 02:04:57,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:57,135 INFO L225 Difference]: With dead ends: 34 [2020-08-19 02:04:57,136 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 02:04:57,136 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 [2020-08-19 02:04:57,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 02:04:57,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-19 02:04:57,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 02:04:57,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-19 02:04:57,143 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-19 02:04:57,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:57,143 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-19 02:04:57,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:04:57,144 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-19 02:04:57,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 02:04:57,144 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:57,145 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:57,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 02:04:57,145 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:57,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:57,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-19 02:04:57,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:57,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1141997340] [2020-08-19 02:04:57,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:57,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:57,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:57,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:57,279 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:57,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1141997340] [2020-08-19 02:04:57,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:57,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 02:04:57,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928569446] [2020-08-19 02:04:57,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:04:57,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:57,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:04:57,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:04:57,282 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-19 02:04:57,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:57,371 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-19 02:04:57,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 02:04:57,372 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-19 02:04:57,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:57,373 INFO L225 Difference]: With dead ends: 38 [2020-08-19 02:04:57,373 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 02:04:57,374 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 [2020-08-19 02:04:57,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 02:04:57,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-19 02:04:57,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 02:04:57,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-19 02:04:57,380 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-19 02:04:57,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:57,380 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-19 02:04:57,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:04:57,381 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-19 02:04:57,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 02:04:57,381 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:57,382 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:57,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 02:04:57,382 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:57,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:57,383 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-19 02:04:57,383 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:57,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [800796249] [2020-08-19 02:04:57,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:57,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:57,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:57,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:57,507 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:57,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [800796249] [2020-08-19 02:04:57,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:57,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 02:04:57,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044419633] [2020-08-19 02:04:57,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 02:04:57,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:57,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 02:04:57,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:04:57,510 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-19 02:04:57,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:57,630 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-19 02:04:57,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 02:04:57,631 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-19 02:04:57,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:57,632 INFO L225 Difference]: With dead ends: 42 [2020-08-19 02:04:57,632 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 02:04:57,633 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 [2020-08-19 02:04:57,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 02:04:57,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-19 02:04:57,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 02:04:57,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-19 02:04:57,638 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-19 02:04:57,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:57,639 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-19 02:04:57,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 02:04:57,639 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-19 02:04:57,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-19 02:04:57,640 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:57,640 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:57,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 02:04:57,641 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:57,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:57,641 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-19 02:04:57,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:57,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [282993283] [2020-08-19 02:04:57,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:57,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:57,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:57,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:57,767 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:57,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [282993283] [2020-08-19 02:04:57,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:57,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 02:04:57,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230586486] [2020-08-19 02:04:57,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 02:04:57,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:57,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 02:04:57,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-19 02:04:57,769 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-19 02:04:57,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:57,898 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-19 02:04:57,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 02:04:57,899 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-19 02:04:57,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:57,900 INFO L225 Difference]: With dead ends: 46 [2020-08-19 02:04:57,900 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 02:04:57,901 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:04:57,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 02:04:57,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-19 02:04:57,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 02:04:57,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-19 02:04:57,912 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-19 02:04:57,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:57,913 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-19 02:04:57,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 02:04:57,913 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-19 02:04:57,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 02:04:57,916 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:57,916 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:57,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 02:04:57,916 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:57,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:57,917 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-19 02:04:57,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:57,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [291849415] [2020-08-19 02:04:57,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:57,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:58,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:58,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:58,132 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:58,132 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [291849415] [2020-08-19 02:04:58,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:58,133 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 02:04:58,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259791357] [2020-08-19 02:04:58,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 02:04:58,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:58,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 02:04:58,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:04:58,135 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-19 02:04:58,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:58,292 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-19 02:04:58,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 02:04:58,295 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-19 02:04:58,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:58,296 INFO L225 Difference]: With dead ends: 50 [2020-08-19 02:04:58,296 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 02:04:58,297 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 [2020-08-19 02:04:58,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 02:04:58,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-19 02:04:58,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 02:04:58,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-19 02:04:58,311 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-19 02:04:58,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:58,312 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-19 02:04:58,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 02:04:58,313 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-19 02:04:58,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 02:04:58,314 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:58,314 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:58,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 02:04:58,315 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:58,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:58,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-19 02:04:58,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:58,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1596924241] [2020-08-19 02:04:58,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:58,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:58,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:58,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:58,517 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:58,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1596924241] [2020-08-19 02:04:58,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:58,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 02:04:58,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165854517] [2020-08-19 02:04:58,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 02:04:58,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:58,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 02:04:58,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:04:58,521 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-19 02:04:58,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:58,735 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-19 02:04:58,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 02:04:58,735 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-19 02:04:58,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:58,736 INFO L225 Difference]: With dead ends: 54 [2020-08-19 02:04:58,737 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 02:04:58,738 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 [2020-08-19 02:04:58,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 02:04:58,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-19 02:04:58,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 02:04:58,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-19 02:04:58,743 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-19 02:04:58,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:58,744 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-19 02:04:58,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 02:04:58,744 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-19 02:04:58,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-19 02:04:58,745 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:58,745 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:58,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 02:04:58,745 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:58,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:58,746 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-19 02:04:58,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:58,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [720520317] [2020-08-19 02:04:58,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:58,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:58,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:58,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:58,937 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:58,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [720520317] [2020-08-19 02:04:58,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:58,938 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 02:04:58,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594298979] [2020-08-19 02:04:58,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 02:04:58,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:58,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 02:04:58,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:04:58,941 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-19 02:04:59,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:59,133 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-19 02:04:59,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 02:04:59,134 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-19 02:04:59,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:59,135 INFO L225 Difference]: With dead ends: 58 [2020-08-19 02:04:59,135 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 02:04:59,135 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 [2020-08-19 02:04:59,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 02:04:59,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-19 02:04:59,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 02:04:59,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-19 02:04:59,141 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-19 02:04:59,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:59,142 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-19 02:04:59,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 02:04:59,142 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-19 02:04:59,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 02:04:59,143 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:59,143 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:59,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 02:04:59,143 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:59,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:59,144 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-19 02:04:59,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:59,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [106393662] [2020-08-19 02:04:59,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:59,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:59,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:59,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:59,315 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:59,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [106393662] [2020-08-19 02:04:59,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:59,316 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 02:04:59,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830521219] [2020-08-19 02:04:59,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 02:04:59,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:59,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 02:04:59,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-19 02:04:59,317 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-19 02:04:59,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:04:59,565 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-19 02:04:59,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 02:04:59,566 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-19 02:04:59,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:04:59,566 INFO L225 Difference]: With dead ends: 62 [2020-08-19 02:04:59,567 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 02:04:59,567 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 [2020-08-19 02:04:59,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 02:04:59,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-19 02:04:59,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 02:04:59,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-19 02:04:59,579 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-19 02:04:59,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:04:59,582 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-19 02:04:59,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 02:04:59,583 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-19 02:04:59,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 02:04:59,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:04:59,586 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:04:59,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 02:04:59,586 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:04:59,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:04:59,586 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-19 02:04:59,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:04:59,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346652842] [2020-08-19 02:04:59,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:04:59,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:59,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:04:59,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:04:59,846 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:04:59,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346652842] [2020-08-19 02:04:59,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:04:59,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 02:04:59,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276052952] [2020-08-19 02:04:59,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 02:04:59,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:04:59,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 02:04:59,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:04:59,851 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-19 02:05:00,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:00,115 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-19 02:05:00,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 02:05:00,115 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-19 02:05:00,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:00,116 INFO L225 Difference]: With dead ends: 66 [2020-08-19 02:05:00,116 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 02:05:00,117 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 [2020-08-19 02:05:00,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 02:05:00,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-19 02:05:00,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 02:05:00,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-19 02:05:00,129 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-19 02:05:00,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:00,130 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-19 02:05:00,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 02:05:00,130 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-19 02:05:00,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 02:05:00,132 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:00,132 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:00,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 02:05:00,133 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:00,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:00,133 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-19 02:05:00,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:00,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889130238] [2020-08-19 02:05:00,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:00,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:00,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:00,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:00,414 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:00,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889130238] [2020-08-19 02:05:00,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:00,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 02:05:00,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668119170] [2020-08-19 02:05:00,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 02:05:00,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:00,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 02:05:00,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-19 02:05:00,416 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-19 02:05:00,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:00,716 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-19 02:05:00,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 02:05:00,717 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-19 02:05:00,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:00,717 INFO L225 Difference]: With dead ends: 70 [2020-08-19 02:05:00,717 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 02:05:00,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:05:00,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 02:05:00,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-19 02:05:00,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 02:05:00,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-19 02:05:00,724 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-19 02:05:00,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:00,725 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-19 02:05:00,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 02:05:00,725 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-19 02:05:00,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 02:05:00,726 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:00,726 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:00,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 02:05:00,726 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:00,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:00,726 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-19 02:05:00,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:00,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697444767] [2020-08-19 02:05:00,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:00,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:00,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:00,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:00,955 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:00,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697444767] [2020-08-19 02:05:00,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:00,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 02:05:00,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908837069] [2020-08-19 02:05:00,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 02:05:00,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:00,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 02:05:00,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:05:00,957 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-19 02:05:01,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:01,400 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-19 02:05:01,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 02:05:01,401 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-19 02:05:01,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:01,401 INFO L225 Difference]: With dead ends: 74 [2020-08-19 02:05:01,402 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 02:05:01,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:05:01,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 02:05:01,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-19 02:05:01,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 02:05:01,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-19 02:05:01,419 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-19 02:05:01,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:01,419 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-19 02:05:01,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 02:05:01,421 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-19 02:05:01,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 02:05:01,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:01,422 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:01,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 02:05:01,425 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:01,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:01,425 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-19 02:05:01,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:01,426 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1753253461] [2020-08-19 02:05:01,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:01,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:01,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:01,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:01,765 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:01,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1753253461] [2020-08-19 02:05:01,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:01,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 02:05:01,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007268742] [2020-08-19 02:05:01,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 02:05:01,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:01,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 02:05:01,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:05:01,774 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-19 02:05:02,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:02,199 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-19 02:05:02,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 02:05:02,200 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-19 02:05:02,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:02,201 INFO L225 Difference]: With dead ends: 78 [2020-08-19 02:05:02,201 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 02:05:02,202 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 [2020-08-19 02:05:02,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 02:05:02,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-19 02:05:02,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 02:05:02,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-19 02:05:02,210 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-19 02:05:02,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:02,210 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-19 02:05:02,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 02:05:02,210 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-19 02:05:02,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 02:05:02,211 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:02,211 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:02,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 02:05:02,212 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:02,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:02,212 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-19 02:05:02,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:02,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1540157270] [2020-08-19 02:05:02,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:02,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:02,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:02,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:02,501 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:02,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1540157270] [2020-08-19 02:05:02,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:02,502 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 02:05:02,502 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668420845] [2020-08-19 02:05:02,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 02:05:02,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:02,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 02:05:02,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:05:02,506 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-19 02:05:02,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:02,929 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-19 02:05:02,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 02:05:02,931 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-19 02:05:02,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:02,931 INFO L225 Difference]: With dead ends: 82 [2020-08-19 02:05:02,932 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 02:05:02,932 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 [2020-08-19 02:05:02,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 02:05:02,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-19 02:05:02,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 02:05:02,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-19 02:05:02,944 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-19 02:05:02,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:02,945 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-19 02:05:02,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 02:05:02,945 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-19 02:05:02,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 02:05:02,946 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:02,946 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:02,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 02:05:02,947 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:02,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:02,948 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-19 02:05:02,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:02,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1299331775] [2020-08-19 02:05:02,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:02,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:03,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:03,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:03,323 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:03,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1299331775] [2020-08-19 02:05:03,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:03,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 02:05:03,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870064470] [2020-08-19 02:05:03,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 02:05:03,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:03,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 02:05:03,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-19 02:05:03,325 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-19 02:05:03,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:03,808 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-19 02:05:03,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 02:05:03,811 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-19 02:05:03,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:03,812 INFO L225 Difference]: With dead ends: 86 [2020-08-19 02:05:03,812 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 02:05:03,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:05:03,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 02:05:03,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-19 02:05:03,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 02:05:03,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-19 02:05:03,820 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-19 02:05:03,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:03,831 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-19 02:05:03,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 02:05:03,831 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-19 02:05:03,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 02:05:03,831 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:03,832 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:03,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 02:05:03,832 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:03,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:03,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-19 02:05:03,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:03,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1504725510] [2020-08-19 02:05:03,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:03,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:04,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:04,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:04,199 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:04,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1504725510] [2020-08-19 02:05:04,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:04,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 02:05:04,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567616670] [2020-08-19 02:05:04,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 02:05:04,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:04,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 02:05:04,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:05:04,201 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-19 02:05:04,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:04,776 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-19 02:05:04,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 02:05:04,776 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-19 02:05:04,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:04,777 INFO L225 Difference]: With dead ends: 90 [2020-08-19 02:05:04,777 INFO L226 Difference]: Without dead ends: 51 [2020-08-19 02:05:04,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:05:04,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-19 02:05:04,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-19 02:05:04,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 02:05:04,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-19 02:05:04,784 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-19 02:05:04,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:04,784 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-19 02:05:04,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 02:05:04,785 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-19 02:05:04,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 02:05:04,785 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:04,785 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:04,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 02:05:04,786 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:04,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:04,786 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-19 02:05:04,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:04,787 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204085775] [2020-08-19 02:05:04,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:04,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:05,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:05,170 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:05,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1204085775] [2020-08-19 02:05:05,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:05,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 02:05:05,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438393545] [2020-08-19 02:05:05,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 02:05:05,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:05,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 02:05:05,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:05:05,173 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-19 02:05:05,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:05,764 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-19 02:05:05,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 02:05:05,765 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-19 02:05:05,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:05,766 INFO L225 Difference]: With dead ends: 94 [2020-08-19 02:05:05,766 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 02:05:05,767 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 [2020-08-19 02:05:05,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 02:05:05,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-19 02:05:05,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-19 02:05:05,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-19 02:05:05,774 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-19 02:05:05,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:05,774 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-19 02:05:05,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 02:05:05,774 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-19 02:05:05,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-19 02:05:05,775 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:05,775 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:05,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 02:05:05,776 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:05,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:05,776 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-19 02:05:05,777 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:05,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [803723683] [2020-08-19 02:05:05,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:05,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:06,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:06,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:06,250 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:06,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [803723683] [2020-08-19 02:05:06,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:06,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 02:05:06,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134167170] [2020-08-19 02:05:06,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 02:05:06,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:06,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 02:05:06,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:05:06,253 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-19 02:05:06,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:06,905 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-19 02:05:06,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 02:05:06,906 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-19 02:05:06,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:06,907 INFO L225 Difference]: With dead ends: 98 [2020-08-19 02:05:06,907 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 02:05:06,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-19 02:05:06,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 02:05:06,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-19 02:05:06,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 02:05:06,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-19 02:05:06,913 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-19 02:05:06,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:06,914 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-19 02:05:06,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 02:05:06,914 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-19 02:05:06,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 02:05:06,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:06,915 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:06,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 02:05:06,915 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:06,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:06,915 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-19 02:05:06,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:06,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115222795] [2020-08-19 02:05:06,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:06,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:07,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:07,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:07,353 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:07,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115222795] [2020-08-19 02:05:07,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:07,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 02:05:07,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396654823] [2020-08-19 02:05:07,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 02:05:07,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:07,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 02:05:07,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-19 02:05:07,356 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-19 02:05:08,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:08,021 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-19 02:05:08,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 02:05:08,026 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-19 02:05:08,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:08,026 INFO L225 Difference]: With dead ends: 102 [2020-08-19 02:05:08,027 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 02:05:08,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:05:08,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 02:05:08,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-19 02:05:08,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 02:05:08,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-19 02:05:08,040 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-19 02:05:08,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:08,041 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-19 02:05:08,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 02:05:08,041 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-19 02:05:08,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-19 02:05:08,042 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:08,042 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:08,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 02:05:08,042 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:08,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:08,042 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-19 02:05:08,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:08,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370525273] [2020-08-19 02:05:08,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:08,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:08,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:08,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:08,534 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:08,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370525273] [2020-08-19 02:05:08,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:08,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 02:05:08,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745122532] [2020-08-19 02:05:08,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 02:05:08,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:08,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 02:05:08,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:05:08,537 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-19 02:05:09,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:09,447 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-19 02:05:09,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 02:05:09,447 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-19 02:05:09,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:09,448 INFO L225 Difference]: With dead ends: 106 [2020-08-19 02:05:09,448 INFO L226 Difference]: Without dead ends: 59 [2020-08-19 02:05:09,449 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 [2020-08-19 02:05:09,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-19 02:05:09,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-19 02:05:09,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-19 02:05:09,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-19 02:05:09,454 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-19 02:05:09,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:09,455 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-19 02:05:09,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 02:05:09,455 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-19 02:05:09,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 02:05:09,455 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:09,456 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:09,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 02:05:09,456 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:09,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:09,456 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-19 02:05:09,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:09,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109175180] [2020-08-19 02:05:09,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:09,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:09,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:09,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:09,971 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:09,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1109175180] [2020-08-19 02:05:09,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:09,972 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 02:05:09,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583959122] [2020-08-19 02:05:09,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 02:05:09,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:09,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 02:05:09,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-19 02:05:09,973 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-19 02:05:10,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:10,720 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-19 02:05:10,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 02:05:10,720 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-19 02:05:10,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:10,721 INFO L225 Difference]: With dead ends: 110 [2020-08-19 02:05:10,721 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 02:05:10,722 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 [2020-08-19 02:05:10,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 02:05:10,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-19 02:05:10,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 02:05:10,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-19 02:05:10,727 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-19 02:05:10,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:10,727 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-19 02:05:10,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 02:05:10,727 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-19 02:05:10,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 02:05:10,727 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:10,728 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:10,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 02:05:10,728 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:10,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:10,728 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-19 02:05:10,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:10,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1369508533] [2020-08-19 02:05:10,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:10,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:11,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:11,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:11,318 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:11,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1369508533] [2020-08-19 02:05:11,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:11,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 02:05:11,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127893686] [2020-08-19 02:05:11,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 02:05:11,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:11,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 02:05:11,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:05:11,320 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-19 02:05:12,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:12,171 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-19 02:05:12,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 02:05:12,171 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-19 02:05:12,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:12,172 INFO L225 Difference]: With dead ends: 114 [2020-08-19 02:05:12,172 INFO L226 Difference]: Without dead ends: 63 [2020-08-19 02:05:12,173 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 [2020-08-19 02:05:12,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-19 02:05:12,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-19 02:05:12,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-19 02:05:12,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-19 02:05:12,177 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-19 02:05:12,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:12,177 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-19 02:05:12,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 02:05:12,178 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-19 02:05:12,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-19 02:05:12,178 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:12,178 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:12,179 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 02:05:12,179 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:12,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:12,179 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-19 02:05:12,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:12,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530161399] [2020-08-19 02:05:12,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:12,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:12,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:12,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:12,762 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:12,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530161399] [2020-08-19 02:05:12,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:12,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 02:05:12,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529086051] [2020-08-19 02:05:12,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 02:05:12,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:12,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 02:05:12,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-19 02:05:12,764 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-19 02:05:13,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:13,683 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-19 02:05:13,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 02:05:13,684 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-19 02:05:13,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:13,684 INFO L225 Difference]: With dead ends: 118 [2020-08-19 02:05:13,684 INFO L226 Difference]: Without dead ends: 65 [2020-08-19 02:05:13,685 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 [2020-08-19 02:05:13,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-19 02:05:13,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-19 02:05:13,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-19 02:05:13,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-19 02:05:13,691 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-19 02:05:13,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:13,691 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-19 02:05:13,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 02:05:13,691 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-19 02:05:13,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-19 02:05:13,692 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:13,692 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:13,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 02:05:13,692 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:13,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:13,693 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-19 02:05:13,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:13,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [220558882] [2020-08-19 02:05:13,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:13,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:14,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:14,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:14,384 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:14,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [220558882] [2020-08-19 02:05:14,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:14,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 02:05:14,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437568462] [2020-08-19 02:05:14,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 02:05:14,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:14,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 02:05:14,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-19 02:05:14,388 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-19 02:05:15,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:15,470 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-19 02:05:15,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 02:05:15,470 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-19 02:05:15,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:15,471 INFO L225 Difference]: With dead ends: 122 [2020-08-19 02:05:15,471 INFO L226 Difference]: Without dead ends: 67 [2020-08-19 02:05:15,472 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 [2020-08-19 02:05:15,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-19 02:05:15,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-19 02:05:15,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-19 02:05:15,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-19 02:05:15,477 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-19 02:05:15,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:15,478 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-19 02:05:15,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 02:05:15,478 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-19 02:05:15,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-19 02:05:15,479 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:15,479 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:15,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 02:05:15,479 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:15,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:15,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-19 02:05:15,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:15,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [399817087] [2020-08-19 02:05:15,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:15,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:16,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:16,202 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:16,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [399817087] [2020-08-19 02:05:16,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:16,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 02:05:16,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806291555] [2020-08-19 02:05:16,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 02:05:16,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:16,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 02:05:16,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-19 02:05:16,204 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-19 02:05:17,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:17,537 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-19 02:05:17,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 02:05:17,537 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-19 02:05:17,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:17,538 INFO L225 Difference]: With dead ends: 126 [2020-08-19 02:05:17,538 INFO L226 Difference]: Without dead ends: 69 [2020-08-19 02:05:17,539 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 [2020-08-19 02:05:17,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-19 02:05:17,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-19 02:05:17,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-19 02:05:17,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-19 02:05:17,543 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-19 02:05:17,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:17,543 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-19 02:05:17,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 02:05:17,544 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-19 02:05:17,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-19 02:05:17,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:17,544 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:17,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 02:05:17,545 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:17,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:17,545 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-19 02:05:17,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:17,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [886794080] [2020-08-19 02:05:17,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:17,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:18,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:18,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:18,283 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:18,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [886794080] [2020-08-19 02:05:18,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:18,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 02:05:18,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045281757] [2020-08-19 02:05:18,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 02:05:18,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:18,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 02:05:18,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-19 02:05:18,285 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-19 02:05:19,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:19,558 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-19 02:05:19,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 02:05:19,559 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-19 02:05:19,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:19,560 INFO L225 Difference]: With dead ends: 130 [2020-08-19 02:05:19,560 INFO L226 Difference]: Without dead ends: 71 [2020-08-19 02:05:19,561 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 [2020-08-19 02:05:19,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-19 02:05:19,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-19 02:05:19,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-19 02:05:19,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-19 02:05:19,567 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-19 02:05:19,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:19,567 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-19 02:05:19,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 02:05:19,567 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-19 02:05:19,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-19 02:05:19,568 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:19,568 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:19,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 02:05:19,568 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:19,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:19,569 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-19 02:05:19,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:19,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33701697] [2020-08-19 02:05:19,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:19,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:20,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:20,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:20,377 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:20,378 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33701697] [2020-08-19 02:05:20,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:20,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 02:05:20,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862469039] [2020-08-19 02:05:20,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 02:05:20,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:20,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 02:05:20,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-19 02:05:20,379 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-19 02:05:21,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:21,654 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-19 02:05:21,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 02:05:21,656 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-19 02:05:21,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:21,657 INFO L225 Difference]: With dead ends: 134 [2020-08-19 02:05:21,657 INFO L226 Difference]: Without dead ends: 73 [2020-08-19 02:05:21,658 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 [2020-08-19 02:05:21,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-19 02:05:21,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-19 02:05:21,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-19 02:05:21,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-19 02:05:21,663 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-19 02:05:21,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:21,663 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-19 02:05:21,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 02:05:21,663 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-19 02:05:21,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-19 02:05:21,664 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:21,664 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:21,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 02:05:21,665 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:21,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:21,665 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-19 02:05:21,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:21,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116715123] [2020-08-19 02:05:21,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:21,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:22,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:22,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:22,626 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:22,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116715123] [2020-08-19 02:05:22,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:22,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 02:05:22,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344306572] [2020-08-19 02:05:22,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 02:05:22,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:22,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 02:05:22,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-19 02:05:22,630 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-19 02:05:24,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:24,279 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-19 02:05:24,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 02:05:24,280 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-19 02:05:24,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:24,281 INFO L225 Difference]: With dead ends: 138 [2020-08-19 02:05:24,281 INFO L226 Difference]: Without dead ends: 75 [2020-08-19 02:05:24,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-19 02:05:24,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-19 02:05:24,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-19 02:05:24,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-19 02:05:24,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-19 02:05:24,288 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-19 02:05:24,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:24,288 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-19 02:05:24,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 02:05:24,288 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-19 02:05:24,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-19 02:05:24,289 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:24,289 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:24,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 02:05:24,290 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:24,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:24,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-19 02:05:24,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:24,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227197576] [2020-08-19 02:05:24,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:24,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:25,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:25,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:25,199 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:25,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227197576] [2020-08-19 02:05:25,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:25,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 02:05:25,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653836056] [2020-08-19 02:05:25,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 02:05:25,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:25,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 02:05:25,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-19 02:05:25,203 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-19 02:05:26,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:26,840 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-19 02:05:26,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 02:05:26,842 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-19 02:05:26,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:26,843 INFO L225 Difference]: With dead ends: 142 [2020-08-19 02:05:26,843 INFO L226 Difference]: Without dead ends: 77 [2020-08-19 02:05:26,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:05:26,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-19 02:05:26,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-19 02:05:26,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-19 02:05:26,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-19 02:05:26,850 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-19 02:05:26,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:26,850 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-19 02:05:26,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 02:05:26,851 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-19 02:05:26,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-19 02:05:26,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:26,851 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:26,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 02:05:26,852 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:26,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:26,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-19 02:05:26,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:26,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227434056] [2020-08-19 02:05:26,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:26,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:27,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:27,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:27,785 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:27,786 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227434056] [2020-08-19 02:05:27,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:27,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 02:05:27,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807263353] [2020-08-19 02:05:27,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 02:05:27,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:27,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 02:05:27,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:05:27,788 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-19 02:05:29,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:29,342 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-19 02:05:29,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 02:05:29,344 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-19 02:05:29,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:29,345 INFO L225 Difference]: With dead ends: 146 [2020-08-19 02:05:29,345 INFO L226 Difference]: Without dead ends: 79 [2020-08-19 02:05:29,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 02:05:29,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-19 02:05:29,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-19 02:05:29,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-19 02:05:29,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-19 02:05:29,354 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-19 02:05:29,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:29,355 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-19 02:05:29,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 02:05:29,355 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-19 02:05:29,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-19 02:05:29,355 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:29,356 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:29,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 02:05:29,356 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:29,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:29,356 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-19 02:05:29,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:29,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [557075573] [2020-08-19 02:05:29,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:29,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:30,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:30,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:30,294 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:30,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [557075573] [2020-08-19 02:05:30,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:30,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 02:05:30,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376017891] [2020-08-19 02:05:30,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 02:05:30,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:30,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 02:05:30,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 02:05:30,296 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-19 02:05:31,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:31,926 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-19 02:05:31,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 02:05:31,929 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-19 02:05:31,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:31,930 INFO L225 Difference]: With dead ends: 150 [2020-08-19 02:05:31,930 INFO L226 Difference]: Without dead ends: 81 [2020-08-19 02:05:31,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 02:05:31,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-19 02:05:31,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-19 02:05:31,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-19 02:05:31,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-19 02:05:31,938 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-19 02:05:31,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:31,939 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-19 02:05:31,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 02:05:31,939 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-19 02:05:31,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-19 02:05:31,939 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:31,940 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:31,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 02:05:31,940 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:31,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:31,940 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-19 02:05:31,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:31,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [864263042] [2020-08-19 02:05:31,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:31,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:32,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:32,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:32,934 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:32,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [864263042] [2020-08-19 02:05:32,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:32,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 02:05:32,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357465568] [2020-08-19 02:05:32,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 02:05:32,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:32,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 02:05:32,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 02:05:32,936 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-19 02:05:34,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:34,642 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-19 02:05:34,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 02:05:34,643 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-19 02:05:34,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:34,644 INFO L225 Difference]: With dead ends: 154 [2020-08-19 02:05:34,644 INFO L226 Difference]: Without dead ends: 83 [2020-08-19 02:05:34,645 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 [2020-08-19 02:05:34,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-19 02:05:34,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-19 02:05:34,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-19 02:05:34,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-19 02:05:34,650 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-19 02:05:34,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:34,651 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-19 02:05:34,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 02:05:34,651 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-19 02:05:34,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-19 02:05:34,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:34,652 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:34,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 02:05:34,652 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:34,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:34,652 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-19 02:05:34,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:34,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628977793] [2020-08-19 02:05:34,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:34,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:35,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:35,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:35,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:35,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628977793] [2020-08-19 02:05:35,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:35,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 02:05:35,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080429843] [2020-08-19 02:05:35,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 02:05:35,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:35,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 02:05:35,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 02:05:35,673 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-19 02:05:37,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:37,462 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-19 02:05:37,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 02:05:37,463 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-19 02:05:37,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:37,464 INFO L225 Difference]: With dead ends: 158 [2020-08-19 02:05:37,464 INFO L226 Difference]: Without dead ends: 85 [2020-08-19 02:05:37,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:05:37,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-19 02:05:37,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-19 02:05:37,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-19 02:05:37,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-19 02:05:37,470 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-19 02:05:37,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:37,471 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-19 02:05:37,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 02:05:37,471 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-19 02:05:37,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-19 02:05:37,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:37,472 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:37,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 02:05:37,472 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:37,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:37,472 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-19 02:05:37,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:37,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2086662171] [2020-08-19 02:05:37,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:37,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:38,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:38,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:38,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:38,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2086662171] [2020-08-19 02:05:38,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:38,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 02:05:38,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650689915] [2020-08-19 02:05:38,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 02:05:38,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:38,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 02:05:38,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:05:38,594 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-19 02:05:40,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:40,468 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-19 02:05:40,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 02:05:40,470 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-19 02:05:40,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:40,471 INFO L225 Difference]: With dead ends: 162 [2020-08-19 02:05:40,471 INFO L226 Difference]: Without dead ends: 87 [2020-08-19 02:05:40,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 02:05:40,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-19 02:05:40,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-19 02:05:40,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-19 02:05:40,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-19 02:05:40,484 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-19 02:05:40,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:40,485 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-19 02:05:40,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 02:05:40,485 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-19 02:05:40,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-19 02:05:40,485 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:40,486 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:40,486 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 02:05:40,486 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:40,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:40,486 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-19 02:05:40,487 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:40,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [276614749] [2020-08-19 02:05:40,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:40,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:41,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:41,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:41,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:41,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [276614749] [2020-08-19 02:05:41,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:41,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 02:05:41,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261204258] [2020-08-19 02:05:41,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 02:05:41,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:41,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 02:05:41,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 02:05:41,750 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-19 02:05:43,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:43,831 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-19 02:05:43,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 02:05:43,832 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-19 02:05:43,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:43,833 INFO L225 Difference]: With dead ends: 166 [2020-08-19 02:05:43,833 INFO L226 Difference]: Without dead ends: 89 [2020-08-19 02:05:43,835 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 [2020-08-19 02:05:43,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-19 02:05:43,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-19 02:05:43,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-19 02:05:43,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-19 02:05:43,840 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-19 02:05:43,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:43,841 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-19 02:05:43,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 02:05:43,841 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-19 02:05:43,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-19 02:05:43,841 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:43,842 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:43,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 02:05:43,842 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:43,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:43,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-19 02:05:43,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:43,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [186285910] [2020-08-19 02:05:43,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:43,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:45,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:45,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:45,060 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:45,061 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [186285910] [2020-08-19 02:05:45,061 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:45,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 02:05:45,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986288540] [2020-08-19 02:05:45,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 02:05:45,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:45,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 02:05:45,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 02:05:45,062 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-19 02:05:47,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:47,206 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-19 02:05:47,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 02:05:47,211 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-19 02:05:47,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:47,212 INFO L225 Difference]: With dead ends: 170 [2020-08-19 02:05:47,213 INFO L226 Difference]: Without dead ends: 91 [2020-08-19 02:05:47,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 02:05:47,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-19 02:05:47,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-19 02:05:47,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-19 02:05:47,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-19 02:05:47,230 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-19 02:05:47,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:47,230 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-19 02:05:47,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 02:05:47,230 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-19 02:05:47,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-19 02:05:47,231 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:47,231 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:47,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 02:05:47,231 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:47,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:47,232 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-19 02:05:47,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:47,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312147567] [2020-08-19 02:05:47,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:47,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:48,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:48,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:48,610 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:48,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312147567] [2020-08-19 02:05:48,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:48,610 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 02:05:48,610 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179183037] [2020-08-19 02:05:48,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 02:05:48,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:48,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 02:05:48,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 02:05:48,612 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-19 02:05:50,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:50,891 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-19 02:05:50,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 02:05:50,892 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-19 02:05:50,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:50,893 INFO L225 Difference]: With dead ends: 174 [2020-08-19 02:05:50,893 INFO L226 Difference]: Without dead ends: 93 [2020-08-19 02:05:50,894 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 [2020-08-19 02:05:50,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-19 02:05:50,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-19 02:05:50,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-19 02:05:50,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-19 02:05:50,901 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-19 02:05:50,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:50,902 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-19 02:05:50,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 02:05:50,902 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-19 02:05:50,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-19 02:05:50,903 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:50,903 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:50,903 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 02:05:50,903 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:50,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:50,903 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-19 02:05:50,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:50,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108818986] [2020-08-19 02:05:50,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:50,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:52,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:05:52,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:05:52,288 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:05:52,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108818986] [2020-08-19 02:05:52,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:05:52,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 02:05:52,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035788336] [2020-08-19 02:05:52,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 02:05:52,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:05:52,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 02:05:52,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 02:05:52,289 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states. [2020-08-19 02:05:54,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:05:54,694 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2020-08-19 02:05:54,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 02:05:54,695 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 89 [2020-08-19 02:05:54,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:05:54,695 INFO L225 Difference]: With dead ends: 178 [2020-08-19 02:05:54,695 INFO L226 Difference]: Without dead ends: 95 [2020-08-19 02:05:54,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=121, Invalid=1601, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 02:05:54,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-19 02:05:54,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2020-08-19 02:05:54,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-08-19 02:05:54,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-08-19 02:05:54,701 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 89 [2020-08-19 02:05:54,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:05:54,701 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-08-19 02:05:54,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 02:05:54,701 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-08-19 02:05:54,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-19 02:05:54,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:05:54,702 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 02:05:54,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 02:05:54,702 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:05:54,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:05:54,703 INFO L82 PathProgramCache]: Analyzing trace with hash 477506189, now seen corresponding path program 38 times [2020-08-19 02:05:54,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:05:54,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [545854721] [2020-08-19 02:05:54,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:05:54,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat