/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=0.6 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 01:16:38,728 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 01:16:38,730 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 01:16:38,754 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 01:16:38,754 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 01:16:38,755 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 01:16:38,757 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 01:16:38,758 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 01:16:38,760 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 01:16:38,761 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 01:16:38,762 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 01:16:38,763 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 01:16:38,763 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 01:16:38,764 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 01:16:38,765 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 01:16:38,767 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 01:16:38,768 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 01:16:38,768 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 01:16:38,771 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 01:16:38,775 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 01:16:38,778 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 01:16:38,780 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 01:16:38,781 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 01:16:38,782 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 01:16:38,786 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 01:16:38,797 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 01:16:38,798 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 01:16:38,799 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 01:16:38,800 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 01:16:38,853 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 01:16:38,854 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 01:16:38,856 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 01:16:38,856 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 01:16:38,856 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 01:16:38,857 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 01:16:38,857 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 01:16:38,858 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 01:16:38,858 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 01:16:38,858 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 01:16:38,858 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 01:16:38,858 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 01:16:38,858 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 01:16:38,859 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 01:16:38,859 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 01:16:38,859 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 01:16:38,859 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 01:16:38,859 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 01:16:38,860 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 01:16:38,861 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 01:16:38,861 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 01:16:38,861 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 01:16:38,861 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 01:16:38,862 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 01:16:38,862 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 01:16:38,862 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 01:16:38,862 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 01:16:38,863 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 01:16:38,863 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 01:16:38,863 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=0.6; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6; [2020-08-19 01:16:39,191 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 01:16:39,208 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 01:16:39,213 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 01:16:39,215 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 01:16:39,216 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 01:16:39,216 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-19 01:16:39,283 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4363853b0/f6684f136d2b44b195b3b10e1f7d9cde/FLAG32a9f5da5 [2020-08-19 01:16:39,769 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 01:16:39,770 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-19 01:16:39,776 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4363853b0/f6684f136d2b44b195b3b10e1f7d9cde/FLAG32a9f5da5 [2020-08-19 01:16:40,100 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4363853b0/f6684f136d2b44b195b3b10e1f7d9cde [2020-08-19 01:16:40,111 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 01:16:40,113 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 01:16:40,114 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 01:16:40,114 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 01:16:40,117 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 01:16:40,118 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:16:40" (1/1) ... [2020-08-19 01:16:40,121 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ec5221d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:40, skipping insertion in model container [2020-08-19 01:16:40,122 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:16:40" (1/1) ... [2020-08-19 01:16:40,129 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 01:16:40,146 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 01:16:40,316 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:16:40,321 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 01:16:40,336 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:16:40,348 INFO L208 MainTranslator]: Completed translation [2020-08-19 01:16:40,349 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:40 WrapperNode [2020-08-19 01:16:40,349 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 01:16:40,350 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 01:16:40,350 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 01:16:40,350 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 01:16:40,360 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:40" (1/1) ... [2020-08-19 01:16:40,360 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:40" (1/1) ... [2020-08-19 01:16:40,439 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:40" (1/1) ... [2020-08-19 01:16:40,439 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:40" (1/1) ... [2020-08-19 01:16:40,443 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:40" (1/1) ... [2020-08-19 01:16:40,448 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:40" (1/1) ... [2020-08-19 01:16:40,449 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:40" (1/1) ... [2020-08-19 01:16:40,450 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 01:16:40,451 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 01:16:40,451 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 01:16:40,451 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 01:16:40,452 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:40" (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 01:16:40,517 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 01:16:40,517 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 01:16:40,517 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 01:16:40,517 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 01:16:40,518 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 01:16:40,518 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 01:16:40,518 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 01:16:40,518 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 01:16:40,518 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 01:16:40,692 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 01:16:40,692 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 01:16:40,696 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:16:40 BoogieIcfgContainer [2020-08-19 01:16:40,696 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 01:16:40,698 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 01:16:40,698 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 01:16:40,701 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 01:16:40,701 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 01:16:40" (1/3) ... [2020-08-19 01:16:40,702 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@410e46f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:16:40, skipping insertion in model container [2020-08-19 01:16:40,703 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:40" (2/3) ... [2020-08-19 01:16:40,703 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@410e46f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:16:40, skipping insertion in model container [2020-08-19 01:16:40,703 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:16:40" (3/3) ... [2020-08-19 01:16:40,705 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-19 01:16:40,716 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 01:16:40,723 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 01:16:40,738 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 01:16:40,760 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 01:16:40,760 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 01:16:40,760 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 01:16:40,760 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 01:16:40,761 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 01:16:40,761 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 01:16:40,761 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 01:16:40,761 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 01:16:40,777 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-19 01:16:40,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 01:16:40,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:40,784 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:40,785 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:40,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:40,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-19 01:16:40,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:40,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302180925] [2020-08-19 01:16:40,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:40,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:40,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:40,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,001 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 01:16:41,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302180925] [2020-08-19 01:16:41,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:16:41,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 01:16:41,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960946559] [2020-08-19 01:16:41,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 01:16:41,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:41,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 01:16:41,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 01:16:41,043 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-19 01:16:41,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:41,083 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 01:16:41,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 01:16:41,085 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 01:16:41,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:41,094 INFO L225 Difference]: With dead ends: 29 [2020-08-19 01:16:41,095 INFO L226 Difference]: Without dead ends: 12 [2020-08-19 01:16:41,098 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 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 01:16:41,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-19 01:16:41,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-19 01:16:41,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-19 01:16:41,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-19 01:16:41,142 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-19 01:16:41,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:41,142 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-19 01:16:41,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 01:16:41,143 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-19 01:16:41,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-19 01:16:41,144 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:41,144 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:41,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 01:16:41,145 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:41,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:41,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-19 01:16:41,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:41,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2087331104] [2020-08-19 01:16:41,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:41,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:41,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:41,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2087331104] [2020-08-19 01:16:41,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:41,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 01:16:41,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339645063] [2020-08-19 01:16:41,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 01:16:41,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:41,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 01:16:41,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 01:16:41,239 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-19 01:16:41,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:41,266 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-19 01:16:41,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 01:16:41,267 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-19 01:16:41,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:41,268 INFO L225 Difference]: With dead ends: 18 [2020-08-19 01:16:41,268 INFO L226 Difference]: Without dead ends: 13 [2020-08-19 01:16:41,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 01:16:41,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-19 01:16:41,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-19 01:16:41,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-19 01:16:41,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-19 01:16:41,275 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-19 01:16:41,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:41,276 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-19 01:16:41,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 01:16:41,276 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-19 01:16:41,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 01:16:41,277 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:41,277 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:41,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 01:16:41,278 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:41,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:41,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-19 01:16:41,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:41,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [420752628] [2020-08-19 01:16:41,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:41,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:41,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,395 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:41,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [420752628] [2020-08-19 01:16:41,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:41,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 01:16:41,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884961945] [2020-08-19 01:16:41,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 01:16:41,397 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:41,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 01:16:41,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:16:41,398 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-19 01:16:41,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:41,420 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-19 01:16:41,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 01:16:41,421 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-19 01:16:41,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:41,421 INFO L225 Difference]: With dead ends: 19 [2020-08-19 01:16:41,422 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 01:16:41,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 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 01:16:41,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 01:16:41,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 01:16:41,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 01:16:41,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-19 01:16:41,428 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-19 01:16:41,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:41,429 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-19 01:16:41,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 01:16:41,429 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-19 01:16:41,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 01:16:41,430 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:41,430 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:41,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 01:16:41,431 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:41,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:41,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-19 01:16:41,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:41,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479847385] [2020-08-19 01:16:41,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:41,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:41,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,537 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:41,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479847385] [2020-08-19 01:16:41,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:41,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 01:16:41,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307176434] [2020-08-19 01:16:41,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 01:16:41,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:41,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 01:16:41,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 01:16:41,540 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-19 01:16:41,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:41,567 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-19 01:16:41,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 01:16:41,568 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-19 01:16:41,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:41,569 INFO L225 Difference]: With dead ends: 20 [2020-08-19 01:16:41,569 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 01:16:41,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 01:16:41,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 01:16:41,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 01:16:41,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 01:16:41,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 01:16:41,576 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-19 01:16:41,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:41,576 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 01:16:41,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 01:16:41,576 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 01:16:41,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 01:16:41,577 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:41,577 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:41,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 01:16:41,578 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:41,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:41,578 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-19 01:16:41,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:41,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [433980591] [2020-08-19 01:16:41,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:41,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:41,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,716 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:41,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [433980591] [2020-08-19 01:16:41,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:41,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 01:16:41,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539188136] [2020-08-19 01:16:41,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 01:16:41,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:41,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 01:16:41,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-19 01:16:41,719 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-19 01:16:41,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:41,756 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-19 01:16:41,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 01:16:41,757 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-19 01:16:41,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:41,758 INFO L225 Difference]: With dead ends: 21 [2020-08-19 01:16:41,758 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 01:16:41,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-19 01:16:41,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 01:16:41,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 01:16:41,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 01:16:41,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-19 01:16:41,765 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-19 01:16:41,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:41,765 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-19 01:16:41,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 01:16:41,766 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-19 01:16:41,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 01:16:41,767 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:41,767 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:41,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 01:16:41,767 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:41,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:41,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-19 01:16:41,768 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:41,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1012342233] [2020-08-19 01:16:41,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:41,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:41,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,921 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:41,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1012342233] [2020-08-19 01:16:41,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:41,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 01:16:41,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135580759] [2020-08-19 01:16:41,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 01:16:41,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:41,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 01:16:41,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-19 01:16:41,924 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-19 01:16:41,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:41,967 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-19 01:16:41,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 01:16:41,968 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-19 01:16:41,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:41,969 INFO L225 Difference]: With dead ends: 22 [2020-08-19 01:16:41,969 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 01:16:41,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-19 01:16:41,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 01:16:41,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 01:16:41,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 01:16:41,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 01:16:41,975 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-19 01:16:41,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:41,976 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 01:16:41,976 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 01:16:41,976 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 01:16:41,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 01:16:41,977 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:41,977 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:41,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 01:16:41,977 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:41,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:41,978 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-19 01:16:41,978 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:41,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988030118] [2020-08-19 01:16:41,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:41,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:42,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:42,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:42,125 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:42,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988030118] [2020-08-19 01:16:42,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:42,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 01:16:42,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58922482] [2020-08-19 01:16:42,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 01:16:42,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:42,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 01:16:42,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 01:16:42,132 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-19 01:16:42,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:42,187 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-19 01:16:42,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 01:16:42,188 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-19 01:16:42,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:42,189 INFO L225 Difference]: With dead ends: 23 [2020-08-19 01:16:42,189 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 01:16:42,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 01:16:42,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 01:16:42,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 01:16:42,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 01:16:42,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-19 01:16:42,195 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-19 01:16:42,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:42,195 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-19 01:16:42,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 01:16:42,196 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-19 01:16:42,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 01:16:42,196 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:42,196 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:42,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 01:16:42,197 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:42,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:42,197 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-19 01:16:42,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:42,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450625072] [2020-08-19 01:16:42,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:42,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:42,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:42,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:42,336 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:42,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450625072] [2020-08-19 01:16:42,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:42,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 01:16:42,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808722688] [2020-08-19 01:16:42,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 01:16:42,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:42,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 01:16:42,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 01:16:42,338 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-19 01:16:42,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:42,411 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-19 01:16:42,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 01:16:42,412 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-19 01:16:42,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:42,413 INFO L225 Difference]: With dead ends: 24 [2020-08-19 01:16:42,413 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 01:16:42,414 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 01:16:42,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 01:16:42,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 01:16:42,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 01:16:42,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-19 01:16:42,419 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-19 01:16:42,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:42,419 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-19 01:16:42,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 01:16:42,420 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-19 01:16:42,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 01:16:42,420 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:42,421 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:42,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 01:16:42,421 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:42,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:42,421 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-19 01:16:42,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:42,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [770936246] [2020-08-19 01:16:42,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:42,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:42,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:42,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:42,563 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:42,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [770936246] [2020-08-19 01:16:42,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:42,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 01:16:42,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992729406] [2020-08-19 01:16:42,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 01:16:42,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:42,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 01:16:42,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-19 01:16:42,565 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-19 01:16:42,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:42,630 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-19 01:16:42,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 01:16:42,631 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-19 01:16:42,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:42,632 INFO L225 Difference]: With dead ends: 25 [2020-08-19 01:16:42,632 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 01:16:42,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-19 01:16:42,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 01:16:42,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 01:16:42,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 01:16:42,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 01:16:42,638 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-19 01:16:42,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:42,638 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 01:16:42,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 01:16:42,639 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 01:16:42,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 01:16:42,640 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:42,640 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:42,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 01:16:42,640 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:42,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:42,641 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-19 01:16:42,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:42,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1285098003] [2020-08-19 01:16:42,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:42,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:42,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:42,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:42,815 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:42,816 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1285098003] [2020-08-19 01:16:42,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:42,816 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 01:16:42,816 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955197021] [2020-08-19 01:16:42,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 01:16:42,817 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:42,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 01:16:42,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-19 01:16:42,818 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-19 01:16:42,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:42,907 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 01:16:42,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 01:16:42,908 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-19 01:16:42,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:42,909 INFO L225 Difference]: With dead ends: 26 [2020-08-19 01:16:42,909 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 01:16:42,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-19 01:16:42,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 01:16:42,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 01:16:42,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 01:16:42,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-19 01:16:42,914 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-19 01:16:42,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:42,915 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-19 01:16:42,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 01:16:42,915 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-19 01:16:42,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 01:16:42,916 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:42,916 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:42,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 01:16:42,916 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:42,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:42,917 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-19 01:16:42,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:42,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1860287842] [2020-08-19 01:16:42,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:42,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:43,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:43,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:43,087 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:43,088 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1860287842] [2020-08-19 01:16:43,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:43,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 01:16:43,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937624317] [2020-08-19 01:16:43,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 01:16:43,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:43,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 01:16:43,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-19 01:16:43,090 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-19 01:16:43,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:43,184 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-19 01:16:43,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 01:16:43,185 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-19 01:16:43,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:43,185 INFO L225 Difference]: With dead ends: 27 [2020-08-19 01:16:43,186 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 01:16:43,186 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-19 01:16:43,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 01:16:43,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-19 01:16:43,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 01:16:43,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-19 01:16:43,191 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-19 01:16:43,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:43,192 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-19 01:16:43,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 01:16:43,192 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-19 01:16:43,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 01:16:43,193 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:43,193 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:43,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 01:16:43,193 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:43,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:43,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-19 01:16:43,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:43,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1972199479] [2020-08-19 01:16:43,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:43,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:43,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:43,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:43,411 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:43,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1972199479] [2020-08-19 01:16:43,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:43,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 01:16:43,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267678480] [2020-08-19 01:16:43,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 01:16:43,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:43,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 01:16:43,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-19 01:16:43,413 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-19 01:16:43,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:43,516 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-19 01:16:43,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 01:16:43,517 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-19 01:16:43,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:43,518 INFO L225 Difference]: With dead ends: 28 [2020-08-19 01:16:43,518 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 01:16:43,519 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-19 01:16:43,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 01:16:43,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 01:16:43,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 01:16:43,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 01:16:43,524 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-19 01:16:43,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:43,525 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 01:16:43,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 01:16:43,525 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 01:16:43,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 01:16:43,527 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:43,528 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:43,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 01:16:43,528 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:43,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:43,529 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-19 01:16:43,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:43,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127790565] [2020-08-19 01:16:43,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:43,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:43,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:43,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:43,797 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:43,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127790565] [2020-08-19 01:16:43,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:43,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 01:16:43,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023712823] [2020-08-19 01:16:43,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 01:16:43,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:43,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 01:16:43,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-19 01:16:43,801 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-19 01:16:43,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:43,935 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 01:16:43,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 01:16:43,939 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-19 01:16:43,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:43,940 INFO L225 Difference]: With dead ends: 29 [2020-08-19 01:16:43,940 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 01:16:43,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-19 01:16:43,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 01:16:43,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-19 01:16:43,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 01:16:43,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-19 01:16:43,947 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-19 01:16:43,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:43,947 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-19 01:16:43,948 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 01:16:43,949 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-19 01:16:43,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-19 01:16:43,950 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:43,950 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:43,950 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 01:16:43,950 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:43,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:43,951 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-19 01:16:43,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:43,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274803475] [2020-08-19 01:16:43,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:43,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:44,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:44,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:44,224 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:44,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274803475] [2020-08-19 01:16:44,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:44,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 01:16:44,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924720560] [2020-08-19 01:16:44,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 01:16:44,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:44,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 01:16:44,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 01:16:44,227 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-19 01:16:44,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:44,401 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-19 01:16:44,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 01:16:44,403 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-19 01:16:44,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:44,404 INFO L225 Difference]: With dead ends: 30 [2020-08-19 01:16:44,404 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 01:16:44,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 01:16:44,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 01:16:44,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 01:16:44,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 01:16:44,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-19 01:16:44,412 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-19 01:16:44,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:44,413 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-19 01:16:44,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 01:16:44,413 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-19 01:16:44,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 01:16:44,415 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:44,416 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:44,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 01:16:44,416 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:44,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:44,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-19 01:16:44,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:44,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241696614] [2020-08-19 01:16:44,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:44,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:44,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:44,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:44,699 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:44,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241696614] [2020-08-19 01:16:44,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:44,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 01:16:44,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353055790] [2020-08-19 01:16:44,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 01:16:44,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:44,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 01:16:44,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 01:16:44,703 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-19 01:16:44,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:44,852 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-19 01:16:44,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 01:16:44,854 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-19 01:16:44,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:44,854 INFO L225 Difference]: With dead ends: 31 [2020-08-19 01:16:44,854 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 01:16:44,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 01:16:44,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 01:16:44,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 01:16:44,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 01:16:44,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 01:16:44,862 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-19 01:16:44,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:44,865 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 01:16:44,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 01:16:44,865 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 01:16:44,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 01:16:44,868 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:44,868 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:44,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 01:16:44,868 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:44,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:44,868 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-19 01:16:44,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:44,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694734929] [2020-08-19 01:16:44,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:44,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:45,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:45,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:45,144 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:45,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694734929] [2020-08-19 01:16:45,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:45,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 01:16:45,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270527912] [2020-08-19 01:16:45,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 01:16:45,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:45,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 01:16:45,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-19 01:16:45,147 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-19 01:16:45,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:45,321 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 01:16:45,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 01:16:45,323 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-19 01:16:45,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:45,324 INFO L225 Difference]: With dead ends: 32 [2020-08-19 01:16:45,324 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 01:16:45,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-19 01:16:45,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 01:16:45,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-19 01:16:45,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 01:16:45,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-19 01:16:45,329 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-19 01:16:45,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:45,330 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-19 01:16:45,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 01:16:45,330 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-19 01:16:45,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 01:16:45,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:45,331 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:45,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 01:16:45,331 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:45,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:45,331 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-19 01:16:45,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:45,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1548449951] [2020-08-19 01:16:45,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:45,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:45,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:45,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:45,611 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:45,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1548449951] [2020-08-19 01:16:45,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:45,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 01:16:45,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700223835] [2020-08-19 01:16:45,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 01:16:45,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:45,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 01:16:45,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-19 01:16:45,615 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-19 01:16:45,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:45,800 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-19 01:16:45,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 01:16:45,803 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-19 01:16:45,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:45,814 INFO L225 Difference]: With dead ends: 33 [2020-08-19 01:16:45,814 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 01:16:45,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-19 01:16:45,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 01:16:45,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-19 01:16:45,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 01:16:45,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-19 01:16:45,821 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-19 01:16:45,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:45,821 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-19 01:16:45,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 01:16:45,822 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-19 01:16:45,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 01:16:45,822 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:45,824 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:45,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 01:16:45,824 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:45,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:45,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-19 01:16:45,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:45,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1842603033] [2020-08-19 01:16:45,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:45,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:46,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:46,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:46,124 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:46,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1842603033] [2020-08-19 01:16:46,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:46,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 01:16:46,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128230764] [2020-08-19 01:16:46,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 01:16:46,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:46,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 01:16:46,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 01:16:46,129 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-19 01:16:46,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:46,355 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-19 01:16:46,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 01:16:46,356 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-19 01:16:46,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:46,356 INFO L225 Difference]: With dead ends: 34 [2020-08-19 01:16:46,357 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 01:16:46,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 01:16:46,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 01:16:46,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 01:16:46,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 01:16:46,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 01:16:46,362 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-19 01:16:46,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:46,362 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 01:16:46,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 01:16:46,363 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 01:16:46,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 01:16:46,363 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:46,363 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:46,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 01:16:46,364 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:46,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:46,364 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-19 01:16:46,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:46,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513007548] [2020-08-19 01:16:46,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:46,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:46,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:46,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:46,713 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:46,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513007548] [2020-08-19 01:16:46,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:46,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 01:16:46,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527944543] [2020-08-19 01:16:46,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 01:16:46,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:46,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 01:16:46,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 01:16:46,715 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-19 01:16:46,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:46,954 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 01:16:46,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 01:16:46,956 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-19 01:16:46,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:46,956 INFO L225 Difference]: With dead ends: 35 [2020-08-19 01:16:46,956 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 01:16:46,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 01:16:46,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 01:16:46,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-19 01:16:46,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 01:16:46,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-19 01:16:46,962 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-19 01:16:46,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:46,962 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-19 01:16:46,962 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 01:16:46,963 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-19 01:16:46,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-19 01:16:46,963 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:46,963 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:46,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 01:16:46,964 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:46,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:46,964 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-19 01:16:46,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:46,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851044874] [2020-08-19 01:16:46,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:46,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:47,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:47,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:47,315 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:47,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851044874] [2020-08-19 01:16:47,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:47,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 01:16:47,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385746361] [2020-08-19 01:16:47,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 01:16:47,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:47,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 01:16:47,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-19 01:16:47,317 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-19 01:16:47,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:47,545 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-19 01:16:47,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 01:16:47,546 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-19 01:16:47,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:47,546 INFO L225 Difference]: With dead ends: 36 [2020-08-19 01:16:47,546 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 01:16:47,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-19 01:16:47,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 01:16:47,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-19 01:16:47,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 01:16:47,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-19 01:16:47,552 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-19 01:16:47,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:47,552 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-19 01:16:47,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 01:16:47,553 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-19 01:16:47,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 01:16:47,553 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:47,553 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:47,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 01:16:47,554 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:47,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:47,554 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-19 01:16:47,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:47,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80709743] [2020-08-19 01:16:47,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:47,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:47,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:47,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:47,938 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:47,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80709743] [2020-08-19 01:16:47,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:47,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 01:16:47,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924847304] [2020-08-19 01:16:47,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 01:16:47,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:47,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 01:16:47,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-19 01:16:47,940 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-19 01:16:48,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:48,210 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-19 01:16:48,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 01:16:48,210 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-19 01:16:48,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:48,211 INFO L225 Difference]: With dead ends: 37 [2020-08-19 01:16:48,211 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 01:16:48,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-19 01:16:48,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 01:16:48,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 01:16:48,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 01:16:48,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 01:16:48,221 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-19 01:16:48,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:48,222 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 01:16:48,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 01:16:48,223 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 01:16:48,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 01:16:48,225 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:48,225 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:48,225 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 01:16:48,225 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:48,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:48,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-19 01:16:48,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:48,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490079726] [2020-08-19 01:16:48,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:48,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:48,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:48,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:48,715 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:48,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490079726] [2020-08-19 01:16:48,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:48,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 01:16:48,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905599088] [2020-08-19 01:16:48,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 01:16:48,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:48,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 01:16:48,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-19 01:16:48,718 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-19 01:16:49,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:49,035 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 01:16:49,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 01:16:49,038 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-19 01:16:49,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:49,038 INFO L225 Difference]: With dead ends: 38 [2020-08-19 01:16:49,039 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 01:16:49,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-19 01:16:49,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 01:16:49,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 01:16:49,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 01:16:49,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-19 01:16:49,043 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-19 01:16:49,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:49,044 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-19 01:16:49,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 01:16:49,044 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-19 01:16:49,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 01:16:49,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:49,045 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:49,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 01:16:49,045 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:49,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:49,045 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-19 01:16:49,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:49,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159103384] [2020-08-19 01:16:49,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:49,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:49,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:49,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:49,519 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:49,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159103384] [2020-08-19 01:16:49,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:49,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 01:16:49,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163974776] [2020-08-19 01:16:49,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 01:16:49,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:49,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 01:16:49,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-19 01:16:49,521 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-19 01:16:49,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:49,861 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-19 01:16:49,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 01:16:49,861 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-19 01:16:49,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:49,862 INFO L225 Difference]: With dead ends: 39 [2020-08-19 01:16:49,862 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 01:16:49,863 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-19 01:16:49,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 01:16:49,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 01:16:49,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 01:16:49,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-19 01:16:49,882 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-19 01:16:49,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:49,882 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-19 01:16:49,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 01:16:49,882 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-19 01:16:49,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 01:16:49,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:49,883 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:49,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 01:16:49,884 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:49,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:49,884 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-19 01:16:49,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:49,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [28768668] [2020-08-19 01:16:49,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:49,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:50,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:50,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:50,401 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:50,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [28768668] [2020-08-19 01:16:50,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:50,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 01:16:50,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500664589] [2020-08-19 01:16:50,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 01:16:50,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:50,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 01:16:50,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 01:16:50,404 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-19 01:16:50,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:50,778 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-19 01:16:50,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 01:16:50,778 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-19 01:16:50,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:50,779 INFO L225 Difference]: With dead ends: 40 [2020-08-19 01:16:50,779 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 01:16:50,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 01:16:50,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 01:16:50,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 01:16:50,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 01:16:50,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 01:16:50,784 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-19 01:16:50,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:50,785 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 01:16:50,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 01:16:50,785 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 01:16:50,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 01:16:50,786 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:50,786 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:50,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 01:16:50,786 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:50,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:50,787 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-19 01:16:50,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:50,787 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000691844] [2020-08-19 01:16:50,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:50,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:51,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:51,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:51,287 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:51,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000691844] [2020-08-19 01:16:51,287 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:51,287 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 01:16:51,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312819607] [2020-08-19 01:16:51,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 01:16:51,288 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:51,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 01:16:51,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-19 01:16:51,289 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-19 01:16:51,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:51,615 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 01:16:51,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 01:16:51,615 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-19 01:16:51,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:51,616 INFO L225 Difference]: With dead ends: 41 [2020-08-19 01:16:51,616 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 01:16:51,617 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-19 01:16:51,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 01:16:51,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 01:16:51,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 01:16:51,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-19 01:16:51,623 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-19 01:16:51,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:51,624 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-19 01:16:51,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 01:16:51,624 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-19 01:16:51,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 01:16:51,625 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:51,625 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:51,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 01:16:51,625 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:51,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:51,625 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-19 01:16:51,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:51,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [397495197] [2020-08-19 01:16:51,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:51,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:52,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:52,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:52,198 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:52,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [397495197] [2020-08-19 01:16:52,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:52,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 01:16:52,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052766072] [2020-08-19 01:16:52,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 01:16:52,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:52,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 01:16:52,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 01:16:52,200 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-19 01:16:52,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:52,683 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-19 01:16:52,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 01:16:52,685 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-19 01:16:52,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:52,686 INFO L225 Difference]: With dead ends: 42 [2020-08-19 01:16:52,687 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 01:16:52,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 01:16:52,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 01:16:52,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 01:16:52,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 01:16:52,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-19 01:16:52,697 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-19 01:16:52,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:52,698 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-19 01:16:52,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 01:16:52,698 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-19 01:16:52,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 01:16:52,699 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:52,699 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:52,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 01:16:52,700 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:52,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:52,701 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-19 01:16:52,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:52,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1485287736] [2020-08-19 01:16:52,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:52,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:53,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:53,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:53,284 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:53,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1485287736] [2020-08-19 01:16:53,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:53,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 01:16:53,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044484802] [2020-08-19 01:16:53,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 01:16:53,285 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:53,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 01:16:53,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-19 01:16:53,286 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-19 01:16:53,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:53,749 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-19 01:16:53,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 01:16:53,750 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-19 01:16:53,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:53,751 INFO L225 Difference]: With dead ends: 43 [2020-08-19 01:16:53,751 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 01:16:53,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-19 01:16:53,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 01:16:53,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 01:16:53,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 01:16:53,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 01:16:53,759 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-19 01:16:53,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:53,759 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 01:16:53,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 01:16:53,759 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 01:16:53,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 01:16:53,760 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:53,760 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:53,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 01:16:53,761 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:53,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:53,761 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-19 01:16:53,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:53,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1102510996] [2020-08-19 01:16:53,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:53,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:54,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:54,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:54,413 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:54,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1102510996] [2020-08-19 01:16:54,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:54,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 01:16:54,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232147266] [2020-08-19 01:16:54,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 01:16:54,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:54,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 01:16:54,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 01:16:54,415 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-19 01:16:54,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:54,904 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 01:16:54,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 01:16:54,905 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-19 01:16:54,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:54,906 INFO L225 Difference]: With dead ends: 44 [2020-08-19 01:16:54,906 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 01:16:54,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 01:16:54,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 01:16:54,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 01:16:54,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 01:16:54,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-19 01:16:54,912 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-19 01:16:54,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:54,912 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-19 01:16:54,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 01:16:54,912 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-19 01:16:54,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 01:16:54,913 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:54,913 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:54,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 01:16:54,913 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:54,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:54,914 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-19 01:16:54,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:54,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1732998503] [2020-08-19 01:16:54,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:54,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:55,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:55,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:55,603 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:55,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1732998503] [2020-08-19 01:16:55,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:55,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 01:16:55,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891571233] [2020-08-19 01:16:55,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 01:16:55,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:55,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 01:16:55,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-19 01:16:55,606 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-19 01:16:56,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:56,146 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-19 01:16:56,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 01:16:56,146 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-19 01:16:56,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:56,147 INFO L225 Difference]: With dead ends: 45 [2020-08-19 01:16:56,147 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 01:16:56,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-19 01:16:56,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 01:16:56,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 01:16:56,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 01:16:56,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-19 01:16:56,152 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-19 01:16:56,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:56,152 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-19 01:16:56,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 01:16:56,153 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-19 01:16:56,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 01:16:56,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:56,153 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:56,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 01:16:56,154 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:56,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:56,154 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-19 01:16:56,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:56,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [645633532] [2020-08-19 01:16:56,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:56,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:56,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:56,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:56,830 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:56,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [645633532] [2020-08-19 01:16:56,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:56,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 01:16:56,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847847629] [2020-08-19 01:16:56,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 01:16:56,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:56,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 01:16:56,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 01:16:56,832 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-19 01:16:57,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:57,394 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-19 01:16:57,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 01:16:57,395 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-19 01:16:57,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:57,396 INFO L225 Difference]: With dead ends: 46 [2020-08-19 01:16:57,396 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 01:16:57,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 01:16:57,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 01:16:57,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 01:16:57,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 01:16:57,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 01:16:57,401 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-19 01:16:57,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:57,402 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 01:16:57,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 01:16:57,402 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 01:16:57,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 01:16:57,402 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:57,403 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:57,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 01:16:57,403 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:57,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:57,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-19 01:16:57,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:57,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115986835] [2020-08-19 01:16:57,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:57,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:58,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:58,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:58,164 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:58,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115986835] [2020-08-19 01:16:58,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:58,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 01:16:58,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871026261] [2020-08-19 01:16:58,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 01:16:58,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:58,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 01:16:58,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 01:16:58,166 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-19 01:16:58,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:58,760 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 01:16:58,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 01:16:58,763 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-19 01:16:58,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:58,764 INFO L225 Difference]: With dead ends: 47 [2020-08-19 01:16:58,764 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 01:16:58,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 01:16:58,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 01:16:58,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 01:16:58,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 01:16:58,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-19 01:16:58,769 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-19 01:16:58,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:58,769 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-19 01:16:58,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 01:16:58,769 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-19 01:16:58,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 01:16:58,770 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:58,770 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:58,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 01:16:58,770 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:58,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:58,771 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-19 01:16:58,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:58,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [39663366] [2020-08-19 01:16:58,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:58,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:59,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:59,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:59,565 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:59,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [39663366] [2020-08-19 01:16:59,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:59,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 01:16:59,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442634787] [2020-08-19 01:16:59,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 01:16:59,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:59,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 01:16:59,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 01:16:59,567 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-19 01:17:00,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:00,215 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-19 01:17:00,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 01:17:00,217 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-19 01:17:00,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:00,217 INFO L225 Difference]: With dead ends: 48 [2020-08-19 01:17:00,218 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 01:17:00,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 01:17:00,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 01:17:00,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 01:17:00,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 01:17:00,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-19 01:17:00,223 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-19 01:17:00,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:00,223 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-19 01:17:00,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 01:17:00,224 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-19 01:17:00,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 01:17:00,224 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:00,224 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:00,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 01:17:00,225 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:00,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:00,225 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-19 01:17:00,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:00,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [719691154] [2020-08-19 01:17:00,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:00,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:01,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:01,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:01,063 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:01,064 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [719691154] [2020-08-19 01:17:01,064 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:01,064 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 01:17:01,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476163032] [2020-08-19 01:17:01,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 01:17:01,064 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:01,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 01:17:01,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 01:17:01,065 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-19 01:17:01,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:01,769 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-19 01:17:01,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 01:17:01,769 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-19 01:17:01,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:01,770 INFO L225 Difference]: With dead ends: 49 [2020-08-19 01:17:01,771 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 01:17:01,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 01:17:01,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 01:17:01,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 01:17:01,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 01:17:01,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 01:17:01,776 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-19 01:17:01,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:01,777 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 01:17:01,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 01:17:01,777 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 01:17:01,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 01:17:01,777 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:01,777 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:01,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 01:17:01,778 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:01,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:01,778 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-19 01:17:01,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:01,778 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [938965560] [2020-08-19 01:17:01,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:01,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:02,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:02,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:02,706 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:02,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [938965560] [2020-08-19 01:17:02,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:02,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 01:17:02,707 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333411648] [2020-08-19 01:17:02,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 01:17:02,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:02,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 01:17:02,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 01:17:02,709 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-19 01:17:03,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:03,446 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 01:17:03,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 01:17:03,446 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-19 01:17:03,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:03,447 INFO L225 Difference]: With dead ends: 50 [2020-08-19 01:17:03,447 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 01:17:03,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 01:17:03,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 01:17:03,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 01:17:03,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 01:17:03,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-19 01:17:03,452 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-19 01:17:03,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:03,452 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-19 01:17:03,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 01:17:03,452 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-19 01:17:03,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 01:17:03,453 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:03,453 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:03,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 01:17:03,454 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:03,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:03,454 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-19 01:17:03,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:03,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [221808597] [2020-08-19 01:17:03,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:03,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:04,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:04,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:04,453 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:04,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [221808597] [2020-08-19 01:17:04,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:04,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 01:17:04,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729286903] [2020-08-19 01:17:04,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 01:17:04,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:04,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 01:17:04,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 01:17:04,456 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-19 01:17:05,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:05,243 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-19 01:17:05,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 01:17:05,243 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-19 01:17:05,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:05,244 INFO L225 Difference]: With dead ends: 51 [2020-08-19 01:17:05,244 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 01:17:05,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 01:17:05,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 01:17:05,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 01:17:05,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 01:17:05,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-19 01:17:05,253 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-19 01:17:05,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:05,254 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-19 01:17:05,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 01:17:05,254 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-19 01:17:05,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 01:17:05,255 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:05,255 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:05,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 01:17:05,256 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:05,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:05,256 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-19 01:17:05,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:05,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115878864] [2020-08-19 01:17:05,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:05,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:06,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:06,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:06,257 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:06,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115878864] [2020-08-19 01:17:06,258 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:06,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 01:17:06,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901973573] [2020-08-19 01:17:06,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 01:17:06,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:06,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 01:17:06,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 01:17:06,260 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-19 01:17:07,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:07,111 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-19 01:17:07,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 01:17:07,112 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-19 01:17:07,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:07,113 INFO L225 Difference]: With dead ends: 52 [2020-08-19 01:17:07,113 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 01:17:07,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 01:17:07,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 01:17:07,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 01:17:07,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 01:17:07,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 01:17:07,119 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-19 01:17:07,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:07,119 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 01:17:07,120 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 01:17:07,120 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 01:17:07,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 01:17:07,120 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:07,120 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:07,120 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 01:17:07,121 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:07,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:07,121 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-19 01:17:07,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:07,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [934800610] [2020-08-19 01:17:07,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:07,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:08,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:08,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:08,122 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:08,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [934800610] [2020-08-19 01:17:08,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:08,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 01:17:08,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847863862] [2020-08-19 01:17:08,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 01:17:08,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:08,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 01:17:08,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 01:17:08,124 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-19 01:17:09,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:09,013 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-19 01:17:09,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 01:17:09,014 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-19 01:17:09,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:09,015 INFO L225 Difference]: With dead ends: 53 [2020-08-19 01:17:09,015 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 01:17:09,016 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 01:17:09,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 01:17:09,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 01:17:09,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 01:17:09,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-19 01:17:09,021 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-19 01:17:09,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:09,021 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-19 01:17:09,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 01:17:09,021 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-19 01:17:09,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 01:17:09,022 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:09,022 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:09,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 01:17:09,022 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:09,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:09,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-19 01:17:09,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:09,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [677952649] [2020-08-19 01:17:09,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:09,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:10,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:10,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:10,133 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:10,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [677952649] [2020-08-19 01:17:10,134 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:10,134 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 01:17:10,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760560844] [2020-08-19 01:17:10,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 01:17:10,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:10,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 01:17:10,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 01:17:10,136 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-19 01:17:11,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:11,086 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-19 01:17:11,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 01:17:11,086 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-19 01:17:11,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:11,087 INFO L225 Difference]: With dead ends: 54 [2020-08-19 01:17:11,087 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 01:17:11,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 01:17:11,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 01:17:11,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 01:17:11,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 01:17:11,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-19 01:17:11,094 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-19 01:17:11,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:11,094 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-19 01:17:11,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 01:17:11,094 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-19 01:17:11,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 01:17:11,095 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:11,095 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:11,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 01:17:11,095 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:11,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:11,096 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-19 01:17:11,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:11,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1751063368] [2020-08-19 01:17:11,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:11,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:12,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:12,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:12,256 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:12,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1751063368] [2020-08-19 01:17:12,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:12,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 01:17:12,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208739528] [2020-08-19 01:17:12,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 01:17:12,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:12,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 01:17:12,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 01:17:12,258 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-19 01:17:13,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:13,259 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-19 01:17:13,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 01:17:13,259 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-19 01:17:13,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:13,260 INFO L225 Difference]: With dead ends: 55 [2020-08-19 01:17:13,260 INFO L226 Difference]: Without dead ends: 50 [2020-08-19 01:17:13,261 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 01:17:13,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-19 01:17:13,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-19 01:17:13,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-19 01:17:13,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-19 01:17:13,266 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-19 01:17:13,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:13,266 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-19 01:17:13,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 01:17:13,266 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-19 01:17:13,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-19 01:17:13,267 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:13,267 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:13,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 01:17:13,267 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:13,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:13,268 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-19 01:17:13,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:13,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [15402612] [2020-08-19 01:17:13,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:13,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:14,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:14,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:14,497 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:14,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [15402612] [2020-08-19 01:17:14,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:14,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 01:17:14,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639519208] [2020-08-19 01:17:14,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 01:17:14,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:14,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 01:17:14,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 01:17:14,499 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-19 01:17:15,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:15,526 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-19 01:17:15,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 01:17:15,529 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-19 01:17:15,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:15,530 INFO L225 Difference]: With dead ends: 56 [2020-08-19 01:17:15,530 INFO L226 Difference]: Without dead ends: 51 [2020-08-19 01:17:15,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 01:17:15,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-19 01:17:15,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-19 01:17:15,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 01:17:15,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-19 01:17:15,536 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-19 01:17:15,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:15,536 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-19 01:17:15,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 01:17:15,536 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-19 01:17:15,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 01:17:15,537 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:15,537 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:15,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 01:17:15,537 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:15,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:15,537 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-19 01:17:15,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:15,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [995020866] [2020-08-19 01:17:15,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:15,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:16,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:16,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:16,826 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:16,826 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [995020866] [2020-08-19 01:17:16,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:16,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 01:17:16,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762930213] [2020-08-19 01:17:16,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 01:17:16,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:16,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 01:17:16,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 01:17:16,828 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-19 01:17:17,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:17,959 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-19 01:17:17,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 01:17:17,962 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-19 01:17:17,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:17,963 INFO L225 Difference]: With dead ends: 57 [2020-08-19 01:17:17,963 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 01:17:17,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 01:17:17,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 01:17:17,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-19 01:17:17,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 01:17:17,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-19 01:17:17,972 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-19 01:17:17,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:17,972 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-19 01:17:17,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 01:17:17,973 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-19 01:17:17,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 01:17:17,973 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:17,973 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:17,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 01:17:17,974 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:17,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:17,974 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-19 01:17:17,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:17,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [454814227] [2020-08-19 01:17:17,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:18,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:19,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:19,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:19,268 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:19,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [454814227] [2020-08-19 01:17:19,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:19,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 01:17:19,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191252724] [2020-08-19 01:17:19,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 01:17:19,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:19,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 01:17:19,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 01:17:19,270 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-19 01:17:20,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:20,433 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-19 01:17:20,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 01:17:20,433 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-19 01:17:20,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:20,434 INFO L225 Difference]: With dead ends: 58 [2020-08-19 01:17:20,435 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 01:17:20,436 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 01:17:20,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 01:17:20,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-19 01:17:20,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 01:17:20,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-19 01:17:20,440 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-19 01:17:20,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:20,441 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-19 01:17:20,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 01:17:20,441 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-19 01:17:20,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 01:17:20,441 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:20,442 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:20,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 01:17:20,442 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:20,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:20,442 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-19 01:17:20,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:20,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115128366] [2020-08-19 01:17:20,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:20,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:21,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:21,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:21,900 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:21,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115128366] [2020-08-19 01:17:21,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:21,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 01:17:21,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071635928] [2020-08-19 01:17:21,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 01:17:21,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:21,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 01:17:21,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 01:17:21,902 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-19 01:17:23,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:23,142 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-19 01:17:23,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-19 01:17:23,143 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-19 01:17:23,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:23,144 INFO L225 Difference]: With dead ends: 59 [2020-08-19 01:17:23,144 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 01:17:23,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 01:17:23,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 01:17:23,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-19 01:17:23,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 01:17:23,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-19 01:17:23,149 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-19 01:17:23,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:23,149 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-19 01:17:23,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-19 01:17:23,149 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-19 01:17:23,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-19 01:17:23,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:23,150 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:23,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-19 01:17:23,150 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:23,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:23,151 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-19 01:17:23,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:23,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1959716864] [2020-08-19 01:17:23,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:23,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:24,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:24,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:24,647 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:24,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1959716864] [2020-08-19 01:17:24,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:24,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-19 01:17:24,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328025590] [2020-08-19 01:17:24,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-19 01:17:24,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:24,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-19 01:17:24,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 01:17:24,649 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-19 01:17:25,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:25,957 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-19 01:17:25,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-19 01:17:25,963 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-19 01:17:25,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:25,964 INFO L225 Difference]: With dead ends: 60 [2020-08-19 01:17:25,964 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 01:17:25,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 01:17:25,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 01:17:25,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-19 01:17:25,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 01:17:25,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-19 01:17:25,968 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-19 01:17:25,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:25,968 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-19 01:17:25,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-19 01:17:25,968 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-19 01:17:25,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 01:17:25,968 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:25,968 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:25,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-19 01:17:25,969 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:25,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:25,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-19 01:17:25,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:25,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [399189757] [2020-08-19 01:17:25,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:25,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:27,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:27,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:27,506 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:27,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [399189757] [2020-08-19 01:17:27,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:27,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-19 01:17:27,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353716426] [2020-08-19 01:17:27,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-19 01:17:27,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:27,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-19 01:17:27,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 01:17:27,508 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-19 01:17:28,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:28,903 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-19 01:17:28,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-19 01:17:28,904 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-19 01:17:28,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:28,905 INFO L225 Difference]: With dead ends: 61 [2020-08-19 01:17:28,905 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 01:17:28,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 01:17:28,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 01:17:28,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-19 01:17:28,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-19 01:17:28,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-19 01:17:28,910 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-19 01:17:28,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:28,910 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-19 01:17:28,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-19 01:17:28,910 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-19 01:17:28,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 01:17:28,911 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:28,911 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:28,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-19 01:17:28,911 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:28,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:28,912 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-19 01:17:28,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:28,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [992340364] [2020-08-19 01:17:28,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:28,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:30,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:30,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:30,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:30,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [992340364] [2020-08-19 01:17:30,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:30,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-19 01:17:30,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061318775] [2020-08-19 01:17:30,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-19 01:17:30,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:30,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-19 01:17:30,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 01:17:30,492 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-19 01:17:31,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:31,918 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-19 01:17:31,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-19 01:17:31,919 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-19 01:17:31,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:31,920 INFO L225 Difference]: With dead ends: 62 [2020-08-19 01:17:31,920 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 01:17:31,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 01:17:31,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 01:17:31,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-19 01:17:31,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 01:17:31,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-19 01:17:31,925 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-19 01:17:31,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:31,925 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-19 01:17:31,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-19 01:17:31,926 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-19 01:17:31,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 01:17:31,926 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:31,926 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:31,926 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-19 01:17:31,926 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:31,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:31,927 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-19 01:17:31,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:31,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851267020] [2020-08-19 01:17:31,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:31,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:33,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:33,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:33,551 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:33,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851267020] [2020-08-19 01:17:33,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:33,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-19 01:17:33,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897404984] [2020-08-19 01:17:33,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-19 01:17:33,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:33,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-19 01:17:33,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 01:17:33,552 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-19 01:17:35,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:35,010 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-19 01:17:35,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-19 01:17:35,011 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-19 01:17:35,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:35,012 INFO L225 Difference]: With dead ends: 63 [2020-08-19 01:17:35,012 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 01:17:35,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 01:17:35,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 01:17:35,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-19 01:17:35,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 01:17:35,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-19 01:17:35,015 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-19 01:17:35,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:35,015 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-19 01:17:35,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-19 01:17:35,016 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-19 01:17:35,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 01:17:35,017 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:35,017 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:35,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-19 01:17:35,018 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:35,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:35,019 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-19 01:17:35,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:35,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [518352982] [2020-08-19 01:17:35,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:35,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:36,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:36,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:36,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:36,749 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [518352982] [2020-08-19 01:17:36,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:36,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-19 01:17:36,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135723580] [2020-08-19 01:17:36,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-19 01:17:36,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:36,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-19 01:17:36,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 01:17:36,755 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-19 01:17:38,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:38,238 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-19 01:17:38,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-19 01:17:38,239 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-19 01:17:38,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:38,240 INFO L225 Difference]: With dead ends: 64 [2020-08-19 01:17:38,240 INFO L226 Difference]: Without dead ends: 59 [2020-08-19 01:17:38,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 01:17:38,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-19 01:17:38,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-19 01:17:38,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 01:17:38,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-19 01:17:38,245 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-19 01:17:38,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:38,245 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-19 01:17:38,246 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-19 01:17:38,246 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-19 01:17:38,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 01:17:38,246 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:38,246 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:38,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-19 01:17:38,247 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:38,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:38,247 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-19 01:17:38,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:38,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [185139670] [2020-08-19 01:17:38,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:38,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:40,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:40,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:40,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:40,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [185139670] [2020-08-19 01:17:40,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:40,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-19 01:17:40,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228004184] [2020-08-19 01:17:40,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-19 01:17:40,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:40,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-19 01:17:40,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-08-19 01:17:40,030 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 51 states.