/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 false -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-eb0fd7c [2020-09-21 10:29:10,785 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:29:10,789 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:29:10,816 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:29:10,816 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:29:10,817 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:29:10,819 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:29:10,821 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:29:10,823 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:29:10,825 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:29:10,826 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:29:10,827 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:29:10,828 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:29:10,829 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:29:10,830 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:29:10,832 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:29:10,833 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:29:10,834 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:29:10,836 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:29:10,838 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:29:10,839 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:29:10,841 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:29:10,842 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:29:10,843 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:29:10,846 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-21 10:29:10,854 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:29:10,856 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:29:10,856 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:29:10,857 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 [2020-09-21 10:29:10,884 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:29:10,884 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:29:10,885 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:29:10,885 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:29:10,886 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:29:10,886 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:29:10,886 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:29:10,886 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:29:10,887 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:29:10,887 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:29:10,887 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:29:10,887 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:29:10,887 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:29:10,888 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:29:10,888 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:29:10,888 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:29:10,888 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:29:10,889 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:29:10,889 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:29:10,889 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:29:10,889 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:29:10,889 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:29:10,890 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:29:10,890 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:29:10,890 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:29:10,890 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:29:10,890 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:29:10,891 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:29:10,891 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:29:10,891 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 -> false [2020-09-21 10:29:11,422 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:29:11,440 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:29:11,445 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:29:11,447 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:29:11,447 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:29:11,448 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-09-21 10:29:11,525 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6144ab487/286b8007ffee4d05b1876dfa6af4f750/FLAG791e0e21c [2020-09-21 10:29:12,098 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:29:12,099 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-09-21 10:29:12,108 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6144ab487/286b8007ffee4d05b1876dfa6af4f750/FLAG791e0e21c [2020-09-21 10:29:12,423 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6144ab487/286b8007ffee4d05b1876dfa6af4f750 [2020-09-21 10:29:12,437 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:29:12,443 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:29:12,444 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:29:12,444 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:29:12,449 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:29:12,450 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:29:12" (1/1) ... [2020-09-21 10:29:12,454 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47a8d835 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:12, skipping insertion in model container [2020-09-21 10:29:12,454 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:29:12" (1/1) ... [2020-09-21 10:29:12,463 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:29:12,488 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:29:12,729 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:29:12,734 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:29:12,752 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:29:12,767 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:29:12,768 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:12 WrapperNode [2020-09-21 10:29:12,768 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:29:12,769 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:29:12,769 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:29:12,769 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:29:12,784 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:12" (1/1) ... [2020-09-21 10:29:12,784 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:12" (1/1) ... [2020-09-21 10:29:12,790 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:12" (1/1) ... [2020-09-21 10:29:12,790 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:12" (1/1) ... [2020-09-21 10:29:12,890 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:12" (1/1) ... [2020-09-21 10:29:12,898 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:12" (1/1) ... [2020-09-21 10:29:12,899 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:12" (1/1) ... [2020-09-21 10:29:12,901 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:29:12,902 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:29:12,902 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:29:12,902 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:29:12,903 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:12" (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 [2020-09-21 10:29:12,996 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:29:12,997 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:29:12,997 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 10:29:12,997 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:29:12,997 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:29:12,997 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 10:29:12,998 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:29:12,998 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:29:12,998 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:29:13,199 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:29:13,199 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-21 10:29:13,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:29:13 BoogieIcfgContainer [2020-09-21 10:29:13,205 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:29:13,206 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:29:13,206 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:29:13,210 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:29:13,210 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:29:12" (1/3) ... [2020-09-21 10:29:13,211 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d2632c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:29:13, skipping insertion in model container [2020-09-21 10:29:13,211 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:29:12" (2/3) ... [2020-09-21 10:29:13,212 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d2632c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:29:13, skipping insertion in model container [2020-09-21 10:29:13,212 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:29:13" (3/3) ... [2020-09-21 10:29:13,214 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-09-21 10:29:13,225 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:29:13,235 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:29:13,257 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:29:13,285 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:29:13,285 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:29:13,285 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:29:13,285 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:29:13,286 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:29:13,286 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:29:13,286 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:29:13,286 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:29:13,306 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-09-21 10:29:13,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-09-21 10:29:13,313 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:13,314 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:13,315 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:13,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:13,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-09-21 10:29:13,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:13,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1648097673] [2020-09-21 10:29:13,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:13,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:13,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:13,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1648097673] [2020-09-21 10:29:13,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:29:13,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 10:29:13,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155981197] [2020-09-21 10:29:13,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 10:29:13,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:13,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 10:29:13,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:29:13,617 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-09-21 10:29:13,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:13,663 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-09-21 10:29:13,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:29:13,666 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-09-21 10:29:13,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:13,676 INFO L225 Difference]: With dead ends: 29 [2020-09-21 10:29:13,677 INFO L226 Difference]: Without dead ends: 12 [2020-09-21 10:29:13,681 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 [2020-09-21 10:29:13,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-09-21 10:29:13,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-09-21 10:29:13,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-09-21 10:29:13,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-09-21 10:29:13,725 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-09-21 10:29:13,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:13,725 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-09-21 10:29:13,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 10:29:13,726 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-09-21 10:29:13,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-21 10:29:13,727 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:13,727 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:13,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:29:13,727 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:13,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:13,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-09-21 10:29:13,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:13,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [795624908] [2020-09-21 10:29:13,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:13,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:13,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:13,827 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:13,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [795624908] [2020-09-21 10:29:13,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:13,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-09-21 10:29:13,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564093158] [2020-09-21 10:29:13,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:29:13,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:13,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:29:13,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:29:13,833 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-09-21 10:29:13,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:13,870 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-09-21 10:29:13,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:29:13,871 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-09-21 10:29:13,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:13,872 INFO L225 Difference]: With dead ends: 18 [2020-09-21 10:29:13,872 INFO L226 Difference]: Without dead ends: 13 [2020-09-21 10:29:13,873 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 [2020-09-21 10:29:13,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-09-21 10:29:13,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-09-21 10:29:13,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-09-21 10:29:13,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-09-21 10:29:13,879 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-09-21 10:29:13,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:13,879 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-09-21 10:29:13,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:29:13,879 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-09-21 10:29:13,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-09-21 10:29:13,880 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:13,880 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:13,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:29:13,881 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:13,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:13,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-09-21 10:29:13,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:13,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285001753] [2020-09-21 10:29:13,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:13,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:14,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,005 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:14,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285001753] [2020-09-21 10:29:14,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:14,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 10:29:14,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278129732] [2020-09-21 10:29:14,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:29:14,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:14,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:29:14,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:29:14,009 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-09-21 10:29:14,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:14,036 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-09-21 10:29:14,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:29:14,037 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-09-21 10:29:14,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:14,038 INFO L225 Difference]: With dead ends: 19 [2020-09-21 10:29:14,038 INFO L226 Difference]: Without dead ends: 14 [2020-09-21 10:29:14,039 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 [2020-09-21 10:29:14,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-09-21 10:29:14,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-09-21 10:29:14,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-09-21 10:29:14,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-09-21 10:29:14,045 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-09-21 10:29:14,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:14,046 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-09-21 10:29:14,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:29:14,046 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-09-21 10:29:14,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-09-21 10:29:14,047 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:14,047 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:14,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:29:14,048 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:14,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:14,048 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-09-21 10:29:14,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:14,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870443629] [2020-09-21 10:29:14,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:14,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:14,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,161 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:14,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870443629] [2020-09-21 10:29:14,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:14,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:29:14,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932026156] [2020-09-21 10:29:14,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:29:14,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:14,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:29:14,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:29:14,164 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-09-21 10:29:14,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:14,196 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-09-21 10:29:14,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:29:14,197 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-09-21 10:29:14,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:14,198 INFO L225 Difference]: With dead ends: 20 [2020-09-21 10:29:14,199 INFO L226 Difference]: Without dead ends: 15 [2020-09-21 10:29:14,199 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 [2020-09-21 10:29:14,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-09-21 10:29:14,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-09-21 10:29:14,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-09-21 10:29:14,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-09-21 10:29:14,205 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-09-21 10:29:14,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:14,205 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-09-21 10:29:14,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:29:14,206 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-09-21 10:29:14,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-21 10:29:14,206 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:14,207 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:14,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:29:14,207 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:14,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:14,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-09-21 10:29:14,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:14,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468526862] [2020-09-21 10:29:14,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:14,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:14,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,379 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:14,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468526862] [2020-09-21 10:29:14,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:14,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:29:14,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000483824] [2020-09-21 10:29:14,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:29:14,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:14,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:29:14,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:29:14,383 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-09-21 10:29:14,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:14,424 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-09-21 10:29:14,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:29:14,425 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-09-21 10:29:14,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:14,426 INFO L225 Difference]: With dead ends: 21 [2020-09-21 10:29:14,427 INFO L226 Difference]: Without dead ends: 16 [2020-09-21 10:29:14,427 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 [2020-09-21 10:29:14,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-21 10:29:14,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-09-21 10:29:14,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-09-21 10:29:14,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-09-21 10:29:14,434 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-09-21 10:29:14,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:14,434 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-09-21 10:29:14,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:29:14,435 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-09-21 10:29:14,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-21 10:29:14,436 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:14,436 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:14,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:29:14,437 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:14,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:14,437 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-09-21 10:29:14,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:14,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1190907058] [2020-09-21 10:29:14,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:14,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:14,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,640 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:14,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1190907058] [2020-09-21 10:29:14,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:14,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:29:14,641 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739881325] [2020-09-21 10:29:14,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:29:14,642 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:14,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:29:14,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:29:14,643 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-09-21 10:29:14,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:14,698 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-09-21 10:29:14,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:29:14,699 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-09-21 10:29:14,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:14,700 INFO L225 Difference]: With dead ends: 22 [2020-09-21 10:29:14,700 INFO L226 Difference]: Without dead ends: 17 [2020-09-21 10:29:14,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:29:14,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-09-21 10:29:14,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-09-21 10:29:14,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-21 10:29:14,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-09-21 10:29:14,706 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-09-21 10:29:14,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:14,707 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-09-21 10:29:14,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:29:14,707 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-09-21 10:29:14,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-21 10:29:14,708 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:14,708 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:14,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:29:14,709 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:14,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:14,709 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-09-21 10:29:14,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:14,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [874377898] [2020-09-21 10:29:14,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:14,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:14,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:14,850 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:14,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [874377898] [2020-09-21 10:29:14,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:14,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:29:14,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911252232] [2020-09-21 10:29:14,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:29:14,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:14,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:29:14,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:29:14,853 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-09-21 10:29:14,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:14,915 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-09-21 10:29:14,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:29:14,915 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-09-21 10:29:14,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:14,916 INFO L225 Difference]: With dead ends: 23 [2020-09-21 10:29:14,916 INFO L226 Difference]: Without dead ends: 18 [2020-09-21 10:29:14,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:29:14,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-09-21 10:29:14,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-09-21 10:29:14,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-09-21 10:29:14,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-09-21 10:29:14,923 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-09-21 10:29:14,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:14,923 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-09-21 10:29:14,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:29:14,923 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-09-21 10:29:14,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-21 10:29:14,924 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:14,924 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:14,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:29:14,925 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:14,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:14,925 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-09-21 10:29:14,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:14,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952991325] [2020-09-21 10:29:14,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:14,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:15,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:15,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:15,090 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:15,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952991325] [2020-09-21 10:29:15,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:15,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 10:29:15,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354739835] [2020-09-21 10:29:15,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 10:29:15,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:15,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 10:29:15,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:29:15,095 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-09-21 10:29:15,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:15,159 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-09-21 10:29:15,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:29:15,161 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-09-21 10:29:15,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:15,162 INFO L225 Difference]: With dead ends: 24 [2020-09-21 10:29:15,162 INFO L226 Difference]: Without dead ends: 19 [2020-09-21 10:29:15,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:29:15,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-09-21 10:29:15,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-09-21 10:29:15,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-09-21 10:29:15,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-09-21 10:29:15,172 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-09-21 10:29:15,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:15,175 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-09-21 10:29:15,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 10:29:15,175 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-09-21 10:29:15,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-09-21 10:29:15,175 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:15,176 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:15,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:29:15,177 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:15,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:15,178 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-09-21 10:29:15,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:15,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99390477] [2020-09-21 10:29:15,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:15,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:15,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:15,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:15,398 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:15,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99390477] [2020-09-21 10:29:15,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:15,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-21 10:29:15,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970528846] [2020-09-21 10:29:15,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-21 10:29:15,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:15,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-21 10:29:15,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-09-21 10:29:15,401 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-09-21 10:29:15,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:15,474 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-09-21 10:29:15,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-21 10:29:15,475 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-09-21 10:29:15,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:15,476 INFO L225 Difference]: With dead ends: 25 [2020-09-21 10:29:15,476 INFO L226 Difference]: Without dead ends: 20 [2020-09-21 10:29:15,476 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 [2020-09-21 10:29:15,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-09-21 10:29:15,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-09-21 10:29:15,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-09-21 10:29:15,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-09-21 10:29:15,482 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-09-21 10:29:15,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:15,483 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-09-21 10:29:15,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-21 10:29:15,483 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-09-21 10:29:15,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-21 10:29:15,484 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:15,484 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:15,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:29:15,484 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:15,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:15,485 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-09-21 10:29:15,485 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:15,485 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771429526] [2020-09-21 10:29:15,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:15,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:15,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:15,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:15,671 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:15,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771429526] [2020-09-21 10:29:15,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:15,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-21 10:29:15,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259251779] [2020-09-21 10:29:15,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-21 10:29:15,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:15,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-21 10:29:15,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:29:15,674 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-09-21 10:29:15,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:15,767 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-09-21 10:29:15,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:29:15,768 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-09-21 10:29:15,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:15,769 INFO L225 Difference]: With dead ends: 26 [2020-09-21 10:29:15,769 INFO L226 Difference]: Without dead ends: 21 [2020-09-21 10:29:15,770 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 [2020-09-21 10:29:15,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-09-21 10:29:15,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-09-21 10:29:15,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-21 10:29:15,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-09-21 10:29:15,776 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-09-21 10:29:15,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:15,776 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-09-21 10:29:15,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-21 10:29:15,777 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-09-21 10:29:15,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-09-21 10:29:15,778 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:15,778 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:15,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:29:15,778 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:15,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:15,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-09-21 10:29:15,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:15,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [52207177] [2020-09-21 10:29:15,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:15,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:15,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:15,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,001 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:16,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [52207177] [2020-09-21 10:29:16,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:16,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:29:16,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281098541] [2020-09-21 10:29:16,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:29:16,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:16,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:29:16,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:29:16,004 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-09-21 10:29:16,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:16,098 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-09-21 10:29:16,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 10:29:16,098 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-09-21 10:29:16,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:16,099 INFO L225 Difference]: With dead ends: 27 [2020-09-21 10:29:16,099 INFO L226 Difference]: Without dead ends: 22 [2020-09-21 10:29:16,100 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 [2020-09-21 10:29:16,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-09-21 10:29:16,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-09-21 10:29:16,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-09-21 10:29:16,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-09-21 10:29:16,105 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-09-21 10:29:16,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:16,106 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-09-21 10:29:16,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:29:16,106 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-09-21 10:29:16,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-21 10:29:16,107 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:16,107 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:16,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:29:16,107 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:16,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:16,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-09-21 10:29:16,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:16,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773093085] [2020-09-21 10:29:16,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:16,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:16,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,315 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:16,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773093085] [2020-09-21 10:29:16,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:16,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-09-21 10:29:16,316 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519325494] [2020-09-21 10:29:16,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-09-21 10:29:16,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:16,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-09-21 10:29:16,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:29:16,317 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-09-21 10:29:16,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:16,427 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-09-21 10:29:16,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 10:29:16,428 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-09-21 10:29:16,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:16,429 INFO L225 Difference]: With dead ends: 28 [2020-09-21 10:29:16,429 INFO L226 Difference]: Without dead ends: 23 [2020-09-21 10:29:16,429 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 [2020-09-21 10:29:16,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-09-21 10:29:16,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-09-21 10:29:16,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-09-21 10:29:16,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-09-21 10:29:16,435 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-09-21 10:29:16,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:16,435 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-09-21 10:29:16,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-09-21 10:29:16,435 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-09-21 10:29:16,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 10:29:16,436 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:16,436 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:16,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 10:29:16,437 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:16,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:16,437 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-09-21 10:29:16,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:16,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773892475] [2020-09-21 10:29:16,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:16,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:16,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:16,665 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:16,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773892475] [2020-09-21 10:29:16,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:16,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-21 10:29:16,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455207677] [2020-09-21 10:29:16,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-21 10:29:16,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:16,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-21 10:29:16,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:29:16,669 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-09-21 10:29:16,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:16,806 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-09-21 10:29:16,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-21 10:29:16,806 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-09-21 10:29:16,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:16,807 INFO L225 Difference]: With dead ends: 29 [2020-09-21 10:29:16,807 INFO L226 Difference]: Without dead ends: 24 [2020-09-21 10:29:16,808 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 [2020-09-21 10:29:16,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-21 10:29:16,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-09-21 10:29:16,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-09-21 10:29:16,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-09-21 10:29:16,813 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-09-21 10:29:16,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:16,813 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-09-21 10:29:16,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-21 10:29:16,813 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-09-21 10:29:16,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-09-21 10:29:16,814 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:16,814 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:16,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 10:29:16,815 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:16,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:16,815 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-09-21 10:29:16,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:16,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681168309] [2020-09-21 10:29:16,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:16,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:17,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:17,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:17,070 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:17,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [681168309] [2020-09-21 10:29:17,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:17,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-21 10:29:17,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903008838] [2020-09-21 10:29:17,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-21 10:29:17,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:17,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-21 10:29:17,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:29:17,072 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-09-21 10:29:17,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:17,279 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-09-21 10:29:17,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 10:29:17,280 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-09-21 10:29:17,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:17,281 INFO L225 Difference]: With dead ends: 30 [2020-09-21 10:29:17,281 INFO L226 Difference]: Without dead ends: 25 [2020-09-21 10:29:17,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-09-21 10:29:17,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-09-21 10:29:17,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-09-21 10:29:17,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-21 10:29:17,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-09-21 10:29:17,290 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-09-21 10:29:17,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:17,290 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-09-21 10:29:17,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-21 10:29:17,290 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-09-21 10:29:17,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-21 10:29:17,293 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:17,294 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:17,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-21 10:29:17,295 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:17,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:17,296 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-09-21 10:29:17,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:17,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1143016489] [2020-09-21 10:29:17,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:17,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:17,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:17,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:17,595 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:17,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1143016489] [2020-09-21 10:29:17,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:17,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-21 10:29:17,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947246418] [2020-09-21 10:29:17,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-21 10:29:17,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:17,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-21 10:29:17,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:29:17,598 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-09-21 10:29:17,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:17,765 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-09-21 10:29:17,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-21 10:29:17,767 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-09-21 10:29:17,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:17,768 INFO L225 Difference]: With dead ends: 31 [2020-09-21 10:29:17,768 INFO L226 Difference]: Without dead ends: 26 [2020-09-21 10:29:17,769 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 [2020-09-21 10:29:17,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-09-21 10:29:17,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-09-21 10:29:17,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-09-21 10:29:17,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-09-21 10:29:17,783 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-09-21 10:29:17,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:17,783 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-09-21 10:29:17,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-21 10:29:17,783 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-09-21 10:29:17,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-09-21 10:29:17,784 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:17,784 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:17,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-21 10:29:17,785 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:17,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:17,788 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-09-21 10:29:17,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:17,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [753799523] [2020-09-21 10:29:17,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:17,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:18,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:18,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:18,133 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:18,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [753799523] [2020-09-21 10:29:18,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:18,133 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-21 10:29:18,134 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514187488] [2020-09-21 10:29:18,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-21 10:29:18,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:18,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-21 10:29:18,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-09-21 10:29:18,135 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-09-21 10:29:18,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:18,347 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-09-21 10:29:18,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-21 10:29:18,349 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-09-21 10:29:18,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:18,350 INFO L225 Difference]: With dead ends: 32 [2020-09-21 10:29:18,350 INFO L226 Difference]: Without dead ends: 27 [2020-09-21 10:29:18,350 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 [2020-09-21 10:29:18,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-09-21 10:29:18,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-09-21 10:29:18,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-21 10:29:18,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-09-21 10:29:18,356 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-09-21 10:29:18,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:18,357 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-09-21 10:29:18,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-21 10:29:18,357 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-09-21 10:29:18,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-21 10:29:18,359 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:18,359 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:18,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-21 10:29:18,360 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:18,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:18,360 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-09-21 10:29:18,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:18,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407788211] [2020-09-21 10:29:18,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:18,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:18,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:18,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:18,719 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:18,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407788211] [2020-09-21 10:29:18,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:18,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-21 10:29:18,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588211304] [2020-09-21 10:29:18,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-21 10:29:18,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:18,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-21 10:29:18,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-09-21 10:29:18,723 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-09-21 10:29:18,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:18,979 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-09-21 10:29:18,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-21 10:29:18,982 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-09-21 10:29:18,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:18,983 INFO L225 Difference]: With dead ends: 33 [2020-09-21 10:29:18,983 INFO L226 Difference]: Without dead ends: 28 [2020-09-21 10:29:18,983 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 [2020-09-21 10:29:18,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-21 10:29:18,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-09-21 10:29:18,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-21 10:29:18,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-09-21 10:29:18,989 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-09-21 10:29:18,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:18,989 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-09-21 10:29:18,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-21 10:29:18,989 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-09-21 10:29:18,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-21 10:29:18,990 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:18,990 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:18,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-21 10:29:18,991 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:18,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:18,991 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-09-21 10:29:18,992 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:18,992 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [675561925] [2020-09-21 10:29:18,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:19,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:19,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:19,383 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:19,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [675561925] [2020-09-21 10:29:19,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:19,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-09-21 10:29:19,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426705772] [2020-09-21 10:29:19,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-21 10:29:19,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:19,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-21 10:29:19,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:29:19,385 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-09-21 10:29:19,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:19,651 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-09-21 10:29:19,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-21 10:29:19,652 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-09-21 10:29:19,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:19,653 INFO L225 Difference]: With dead ends: 34 [2020-09-21 10:29:19,653 INFO L226 Difference]: Without dead ends: 29 [2020-09-21 10:29:19,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-09-21 10:29:19,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-09-21 10:29:19,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-09-21 10:29:19,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-21 10:29:19,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-09-21 10:29:19,661 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-09-21 10:29:19,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:19,662 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-09-21 10:29:19,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-21 10:29:19,666 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-09-21 10:29:19,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:29:19,667 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:19,667 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:19,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-21 10:29:19,667 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:19,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:19,668 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-09-21 10:29:19,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:19,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730361476] [2020-09-21 10:29:19,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:19,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:20,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,092 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:20,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [730361476] [2020-09-21 10:29:20,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:20,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-21 10:29:20,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739932541] [2020-09-21 10:29:20,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-21 10:29:20,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:20,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-21 10:29:20,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-09-21 10:29:20,095 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-09-21 10:29:20,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:20,335 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-09-21 10:29:20,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-21 10:29:20,336 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-09-21 10:29:20,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:20,336 INFO L225 Difference]: With dead ends: 35 [2020-09-21 10:29:20,337 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 10:29:20,337 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 [2020-09-21 10:29:20,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 10:29:20,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-09-21 10:29:20,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-09-21 10:29:20,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-09-21 10:29:20,342 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-09-21 10:29:20,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:20,342 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-09-21 10:29:20,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-21 10:29:20,343 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-09-21 10:29:20,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-21 10:29:20,343 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:20,343 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:20,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-21 10:29:20,344 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:20,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:20,344 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-09-21 10:29:20,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:20,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1800125131] [2020-09-21 10:29:20,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:20,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:20,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:20,804 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:20,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1800125131] [2020-09-21 10:29:20,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:20,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-21 10:29:20,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353618795] [2020-09-21 10:29:20,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-21 10:29:20,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:20,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-21 10:29:20,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:29:20,806 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-09-21 10:29:21,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:21,118 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-09-21 10:29:21,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-21 10:29:21,118 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-09-21 10:29:21,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:21,119 INFO L225 Difference]: With dead ends: 36 [2020-09-21 10:29:21,119 INFO L226 Difference]: Without dead ends: 31 [2020-09-21 10:29:21,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-09-21 10:29:21,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-09-21 10:29:21,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-09-21 10:29:21,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-09-21 10:29:21,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-09-21 10:29:21,124 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-09-21 10:29:21,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:21,125 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-09-21 10:29:21,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-21 10:29:21,125 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-09-21 10:29:21,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-21 10:29:21,126 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:21,126 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:21,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-21 10:29:21,126 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:21,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:21,127 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-09-21 10:29:21,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:21,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [214746343] [2020-09-21 10:29:21,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:21,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:21,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:21,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:21,604 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:21,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [214746343] [2020-09-21 10:29:21,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:21,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-21 10:29:21,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575762310] [2020-09-21 10:29:21,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-21 10:29:21,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:21,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-21 10:29:21,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:29:21,607 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-09-21 10:29:21,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:21,972 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-09-21 10:29:21,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-09-21 10:29:21,972 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-09-21 10:29:21,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:21,973 INFO L225 Difference]: With dead ends: 37 [2020-09-21 10:29:21,973 INFO L226 Difference]: Without dead ends: 32 [2020-09-21 10:29:21,973 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-09-21 10:29:21,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-09-21 10:29:21,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-09-21 10:29:21,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-21 10:29:21,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-09-21 10:29:21,978 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-09-21 10:29:21,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:21,978 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-09-21 10:29:21,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-21 10:29:21,978 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-09-21 10:29:21,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-21 10:29:21,979 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:21,979 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:21,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-21 10:29:21,979 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:21,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:21,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-09-21 10:29:21,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:21,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1747860964] [2020-09-21 10:29:21,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:21,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:22,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:22,496 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:22,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1747860964] [2020-09-21 10:29:22,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:22,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-09-21 10:29:22,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91347576] [2020-09-21 10:29:22,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-09-21 10:29:22,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:22,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-09-21 10:29:22,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:29:22,500 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-09-21 10:29:22,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:22,837 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-09-21 10:29:22,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-21 10:29:22,840 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-09-21 10:29:22,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:22,841 INFO L225 Difference]: With dead ends: 38 [2020-09-21 10:29:22,841 INFO L226 Difference]: Without dead ends: 33 [2020-09-21 10:29:22,842 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 [2020-09-21 10:29:22,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-21 10:29:22,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-09-21 10:29:22,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-09-21 10:29:22,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-09-21 10:29:22,855 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-09-21 10:29:22,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:22,855 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-09-21 10:29:22,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-09-21 10:29:22,855 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-09-21 10:29:22,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-21 10:29:22,856 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:22,856 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:22,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-21 10:29:22,856 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:22,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:22,860 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-09-21 10:29:22,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:22,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [120022310] [2020-09-21 10:29:22,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:22,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:23,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:23,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:23,369 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:23,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [120022310] [2020-09-21 10:29:23,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:23,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-21 10:29:23,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12135159] [2020-09-21 10:29:23,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-21 10:29:23,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:23,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-21 10:29:23,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-09-21 10:29:23,377 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-09-21 10:29:23,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:23,758 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-09-21 10:29:23,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-09-21 10:29:23,758 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-09-21 10:29:23,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:23,759 INFO L225 Difference]: With dead ends: 39 [2020-09-21 10:29:23,759 INFO L226 Difference]: Without dead ends: 34 [2020-09-21 10:29:23,760 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 [2020-09-21 10:29:23,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-21 10:29:23,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-09-21 10:29:23,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-09-21 10:29:23,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-09-21 10:29:23,771 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-09-21 10:29:23,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:23,771 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-09-21 10:29:23,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-21 10:29:23,772 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-09-21 10:29:23,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-21 10:29:23,772 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:23,772 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:23,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-21 10:29:23,773 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:23,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:23,773 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-09-21 10:29:23,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:23,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [58622452] [2020-09-21 10:29:23,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:23,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:24,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:24,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:24,289 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:24,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [58622452] [2020-09-21 10:29:24,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:24,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-09-21 10:29:24,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862499348] [2020-09-21 10:29:24,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-21 10:29:24,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:24,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-21 10:29:24,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-09-21 10:29:24,292 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-09-21 10:29:24,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:24,729 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-09-21 10:29:24,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-09-21 10:29:24,730 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-09-21 10:29:24,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:24,731 INFO L225 Difference]: With dead ends: 40 [2020-09-21 10:29:24,731 INFO L226 Difference]: Without dead ends: 35 [2020-09-21 10:29:24,732 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 [2020-09-21 10:29:24,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-09-21 10:29:24,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-09-21 10:29:24,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-21 10:29:24,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-09-21 10:29:24,737 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-09-21 10:29:24,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:24,737 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-09-21 10:29:24,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-21 10:29:24,737 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-09-21 10:29:24,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-21 10:29:24,738 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:24,738 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:24,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-21 10:29:24,738 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:24,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:24,739 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-09-21 10:29:24,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:24,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523700428] [2020-09-21 10:29:24,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:24,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:25,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:25,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:25,382 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:25,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523700428] [2020-09-21 10:29:25,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:25,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-09-21 10:29:25,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237956601] [2020-09-21 10:29:25,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-09-21 10:29:25,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:25,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-09-21 10:29:25,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:29:25,385 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-09-21 10:29:25,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:25,850 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-09-21 10:29:25,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-21 10:29:25,851 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-09-21 10:29:25,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:25,852 INFO L225 Difference]: With dead ends: 41 [2020-09-21 10:29:25,852 INFO L226 Difference]: Without dead ends: 36 [2020-09-21 10:29:25,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-09-21 10:29:25,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-09-21 10:29:25,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-09-21 10:29:25,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-09-21 10:29:25,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-09-21 10:29:25,857 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-09-21 10:29:25,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:25,858 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-09-21 10:29:25,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-09-21 10:29:25,858 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-09-21 10:29:25,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-09-21 10:29:25,859 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:25,859 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:25,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-21 10:29:25,859 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:25,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:25,859 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-09-21 10:29:25,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:25,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [425101943] [2020-09-21 10:29:25,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:25,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:26,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:26,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:26,504 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:26,504 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [425101943] [2020-09-21 10:29:26,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:26,505 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-09-21 10:29:26,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140996229] [2020-09-21 10:29:26,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-09-21 10:29:26,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:26,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-09-21 10:29:26,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-09-21 10:29:26,506 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-09-21 10:29:27,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:27,058 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-09-21 10:29:27,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-09-21 10:29:27,059 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-09-21 10:29:27,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:27,060 INFO L225 Difference]: With dead ends: 42 [2020-09-21 10:29:27,060 INFO L226 Difference]: Without dead ends: 37 [2020-09-21 10:29:27,061 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 [2020-09-21 10:29:27,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-09-21 10:29:27,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-09-21 10:29:27,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-21 10:29:27,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-09-21 10:29:27,065 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-09-21 10:29:27,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:27,065 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-09-21 10:29:27,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-09-21 10:29:27,065 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-09-21 10:29:27,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-21 10:29:27,066 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:27,066 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:27,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-21 10:29:27,067 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:27,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:27,067 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-09-21 10:29:27,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:27,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998002552] [2020-09-21 10:29:27,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:27,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:27,866 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:27,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:27,870 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:27,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998002552] [2020-09-21 10:29:27,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:27,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-21 10:29:27,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923029360] [2020-09-21 10:29:27,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-21 10:29:27,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:27,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-21 10:29:27,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:29:27,872 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-09-21 10:29:28,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:28,398 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-09-21 10:29:28,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-09-21 10:29:28,399 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-09-21 10:29:28,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:28,400 INFO L225 Difference]: With dead ends: 43 [2020-09-21 10:29:28,400 INFO L226 Difference]: Without dead ends: 38 [2020-09-21 10:29:28,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-09-21 10:29:28,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-09-21 10:29:28,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-09-21 10:29:28,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-09-21 10:29:28,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-09-21 10:29:28,406 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-09-21 10:29:28,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:28,406 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-09-21 10:29:28,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-21 10:29:28,406 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-09-21 10:29:28,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-09-21 10:29:28,407 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:28,407 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:28,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-09-21 10:29:28,408 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:28,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:28,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-09-21 10:29:28,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:28,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162958197] [2020-09-21 10:29:28,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:28,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:29,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:29,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:29,187 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:29,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162958197] [2020-09-21 10:29:29,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:29,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-09-21 10:29:29,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161130622] [2020-09-21 10:29:29,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-09-21 10:29:29,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:29,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-09-21 10:29:29,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:29:29,189 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-09-21 10:29:29,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:29,801 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-09-21 10:29:29,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-21 10:29:29,802 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-09-21 10:29:29,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:29,802 INFO L225 Difference]: With dead ends: 44 [2020-09-21 10:29:29,803 INFO L226 Difference]: Without dead ends: 39 [2020-09-21 10:29:29,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-09-21 10:29:29,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-21 10:29:29,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-09-21 10:29:29,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-09-21 10:29:29,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-09-21 10:29:29,807 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-09-21 10:29:29,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:29,808 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-09-21 10:29:29,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-09-21 10:29:29,808 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-09-21 10:29:29,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-21 10:29:29,808 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:29,808 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:29,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-09-21 10:29:29,809 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:29,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:29,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-09-21 10:29:29,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:29,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [276944258] [2020-09-21 10:29:29,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:29,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:30,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:30,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:30,644 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:30,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [276944258] [2020-09-21 10:29:30,644 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:30,645 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-09-21 10:29:30,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165503322] [2020-09-21 10:29:30,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-09-21 10:29:30,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:30,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-09-21 10:29:30,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:29:30,646 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-09-21 10:29:31,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:31,311 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-09-21 10:29:31,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-09-21 10:29:31,312 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-09-21 10:29:31,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:31,313 INFO L225 Difference]: With dead ends: 45 [2020-09-21 10:29:31,313 INFO L226 Difference]: Without dead ends: 40 [2020-09-21 10:29:31,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:29:31,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-09-21 10:29:31,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-09-21 10:29:31,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-09-21 10:29:31,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-09-21 10:29:31,318 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-09-21 10:29:31,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:31,318 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-09-21 10:29:31,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-09-21 10:29:31,318 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-09-21 10:29:31,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-09-21 10:29:31,319 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:31,319 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:31,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-09-21 10:29:31,319 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:31,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:31,319 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-09-21 10:29:31,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:31,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569111995] [2020-09-21 10:29:31,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:31,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:32,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:32,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:32,227 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:32,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569111995] [2020-09-21 10:29:32,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:32,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-09-21 10:29:32,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204001944] [2020-09-21 10:29:32,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-09-21 10:29:32,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:32,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-09-21 10:29:32,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:29:32,229 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-09-21 10:29:32,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:32,943 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-09-21 10:29:32,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-09-21 10:29:32,952 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-09-21 10:29:32,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:32,953 INFO L225 Difference]: With dead ends: 46 [2020-09-21 10:29:32,953 INFO L226 Difference]: Without dead ends: 41 [2020-09-21 10:29:32,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-09-21 10:29:32,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-09-21 10:29:32,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-09-21 10:29:32,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 10:29:32,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-09-21 10:29:32,965 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-09-21 10:29:32,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:32,965 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-09-21 10:29:32,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-09-21 10:29:32,965 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-09-21 10:29:32,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-21 10:29:32,966 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:32,966 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:32,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-09-21 10:29:32,966 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:32,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:32,967 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-09-21 10:29:32,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:32,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [989701516] [2020-09-21 10:29:32,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:32,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:33,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:33,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:33,924 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:33,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [989701516] [2020-09-21 10:29:33,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:33,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-21 10:29:33,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161692031] [2020-09-21 10:29:33,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-21 10:29:33,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:33,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-21 10:29:33,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:29:33,926 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-09-21 10:29:34,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:34,689 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-09-21 10:29:34,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-09-21 10:29:34,690 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-09-21 10:29:34,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:34,691 INFO L225 Difference]: With dead ends: 47 [2020-09-21 10:29:34,691 INFO L226 Difference]: Without dead ends: 42 [2020-09-21 10:29:34,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-09-21 10:29:34,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-21 10:29:34,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-09-21 10:29:34,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-21 10:29:34,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-09-21 10:29:34,696 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-09-21 10:29:34,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:34,697 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-09-21 10:29:34,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-21 10:29:34,697 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-09-21 10:29:34,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-21 10:29:34,697 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:34,698 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:34,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-09-21 10:29:34,698 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:34,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:34,698 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-09-21 10:29:34,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:34,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [143273205] [2020-09-21 10:29:34,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:34,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:35,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:35,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:35,632 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:35,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [143273205] [2020-09-21 10:29:35,633 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:35,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-09-21 10:29:35,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691376701] [2020-09-21 10:29:35,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-09-21 10:29:35,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:35,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-09-21 10:29:35,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:29:35,634 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-09-21 10:29:36,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:36,436 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-09-21 10:29:36,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-09-21 10:29:36,436 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-09-21 10:29:36,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:36,437 INFO L225 Difference]: With dead ends: 48 [2020-09-21 10:29:36,437 INFO L226 Difference]: Without dead ends: 43 [2020-09-21 10:29:36,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-09-21 10:29:36,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-09-21 10:29:36,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-09-21 10:29:36,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-09-21 10:29:36,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-09-21 10:29:36,442 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-09-21 10:29:36,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:36,442 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-09-21 10:29:36,442 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-09-21 10:29:36,443 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-09-21 10:29:36,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 10:29:36,443 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:36,443 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:36,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-09-21 10:29:36,444 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:36,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:36,444 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-09-21 10:29:36,444 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:36,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31381355] [2020-09-21 10:29:36,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:36,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:37,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:37,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:37,508 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:37,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31381355] [2020-09-21 10:29:37,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:37,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-21 10:29:37,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368973499] [2020-09-21 10:29:37,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-21 10:29:37,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:37,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-21 10:29:37,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:29:37,511 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-09-21 10:29:38,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:38,378 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-09-21 10:29:38,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-09-21 10:29:38,378 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-09-21 10:29:38,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:38,379 INFO L225 Difference]: With dead ends: 49 [2020-09-21 10:29:38,379 INFO L226 Difference]: Without dead ends: 44 [2020-09-21 10:29:38,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-09-21 10:29:38,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-21 10:29:38,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-09-21 10:29:38,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-09-21 10:29:38,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-09-21 10:29:38,384 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-09-21 10:29:38,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:38,384 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-09-21 10:29:38,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-21 10:29:38,385 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-09-21 10:29:38,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-09-21 10:29:38,385 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:38,385 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:38,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-09-21 10:29:38,386 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:38,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:38,386 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-09-21 10:29:38,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:38,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251177649] [2020-09-21 10:29:38,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:38,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:39,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:39,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:39,515 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:39,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251177649] [2020-09-21 10:29:39,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:39,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-09-21 10:29:39,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321595528] [2020-09-21 10:29:39,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-09-21 10:29:39,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:39,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-09-21 10:29:39,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:29:39,517 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-09-21 10:29:40,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:40,423 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-09-21 10:29:40,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-21 10:29:40,424 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-09-21 10:29:40,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:40,425 INFO L225 Difference]: With dead ends: 50 [2020-09-21 10:29:40,425 INFO L226 Difference]: Without dead ends: 45 [2020-09-21 10:29:40,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-09-21 10:29:40,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-09-21 10:29:40,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-09-21 10:29:40,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-09-21 10:29:40,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-09-21 10:29:40,430 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-09-21 10:29:40,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:40,430 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-09-21 10:29:40,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-09-21 10:29:40,430 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-09-21 10:29:40,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-21 10:29:40,431 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:40,431 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:40,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-09-21 10:29:40,431 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:40,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:40,432 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-09-21 10:29:40,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:40,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1185013444] [2020-09-21 10:29:40,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:40,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:41,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:41,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:41,505 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:41,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1185013444] [2020-09-21 10:29:41,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:41,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-21 10:29:41,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922618372] [2020-09-21 10:29:41,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-21 10:29:41,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:41,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-21 10:29:41,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-09-21 10:29:41,512 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-09-21 10:29:42,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:42,492 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-09-21 10:29:42,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-09-21 10:29:42,493 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-09-21 10:29:42,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:42,494 INFO L225 Difference]: With dead ends: 51 [2020-09-21 10:29:42,494 INFO L226 Difference]: Without dead ends: 46 [2020-09-21 10:29:42,495 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 [2020-09-21 10:29:42,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-21 10:29:42,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-09-21 10:29:42,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-21 10:29:42,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-09-21 10:29:42,509 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-09-21 10:29:42,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:42,509 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-09-21 10:29:42,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-21 10:29:42,510 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-09-21 10:29:42,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-09-21 10:29:42,510 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:42,511 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:42,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-09-21 10:29:42,511 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:42,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:42,511 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-09-21 10:29:42,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:42,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38888000] [2020-09-21 10:29:42,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:42,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:43,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:43,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:43,734 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:43,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38888000] [2020-09-21 10:29:43,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:43,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-09-21 10:29:43,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565313452] [2020-09-21 10:29:43,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-09-21 10:29:43,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:43,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-09-21 10:29:43,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:29:43,736 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-09-21 10:29:44,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:44,728 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-09-21 10:29:44,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-21 10:29:44,729 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-09-21 10:29:44,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:44,730 INFO L225 Difference]: With dead ends: 52 [2020-09-21 10:29:44,730 INFO L226 Difference]: Without dead ends: 47 [2020-09-21 10:29:44,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-09-21 10:29:44,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-09-21 10:29:44,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-09-21 10:29:44,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-09-21 10:29:44,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-09-21 10:29:44,734 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-09-21 10:29:44,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:44,734 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-09-21 10:29:44,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-09-21 10:29:44,735 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-09-21 10:29:44,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-09-21 10:29:44,735 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:44,735 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:44,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-09-21 10:29:44,736 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:44,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:44,736 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-09-21 10:29:44,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:44,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938323867] [2020-09-21 10:29:44,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:44,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:45,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:45,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:46,001 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:46,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938323867] [2020-09-21 10:29:46,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:46,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-09-21 10:29:46,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022033722] [2020-09-21 10:29:46,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-09-21 10:29:46,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:46,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-09-21 10:29:46,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:29:46,004 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-09-21 10:29:47,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:47,104 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-09-21 10:29:47,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-09-21 10:29:47,105 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-09-21 10:29:47,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:47,106 INFO L225 Difference]: With dead ends: 53 [2020-09-21 10:29:47,106 INFO L226 Difference]: Without dead ends: 48 [2020-09-21 10:29:47,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-09-21 10:29:47,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-21 10:29:47,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-09-21 10:29:47,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-09-21 10:29:47,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-09-21 10:29:47,111 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-09-21 10:29:47,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:47,111 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-09-21 10:29:47,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-09-21 10:29:47,111 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-09-21 10:29:47,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-09-21 10:29:47,112 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:47,112 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:47,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-09-21 10:29:47,112 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:47,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:47,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-09-21 10:29:47,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:47,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2025263324] [2020-09-21 10:29:47,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:47,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:48,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:48,404 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:48,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2025263324] [2020-09-21 10:29:48,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:48,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-09-21 10:29:48,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490056052] [2020-09-21 10:29:48,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-09-21 10:29:48,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:48,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-09-21 10:29:48,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-09-21 10:29:48,410 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-09-21 10:29:49,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:49,461 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-09-21 10:29:49,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-09-21 10:29:49,463 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-09-21 10:29:49,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:49,464 INFO L225 Difference]: With dead ends: 54 [2020-09-21 10:29:49,464 INFO L226 Difference]: Without dead ends: 49 [2020-09-21 10:29:49,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-09-21 10:29:49,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-09-21 10:29:49,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-09-21 10:29:49,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-21 10:29:49,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-09-21 10:29:49,469 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-09-21 10:29:49,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:49,470 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-09-21 10:29:49,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-09-21 10:29:49,470 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-09-21 10:29:49,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-21 10:29:49,471 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:49,471 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:49,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-09-21 10:29:49,471 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:49,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:49,471 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-09-21 10:29:49,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:49,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339174580] [2020-09-21 10:29:49,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:49,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:50,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:50,765 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:50,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339174580] [2020-09-21 10:29:50,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:50,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-09-21 10:29:50,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438432376] [2020-09-21 10:29:50,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-09-21 10:29:50,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:50,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-09-21 10:29:50,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-09-21 10:29:50,767 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-09-21 10:29:52,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:52,004 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-09-21 10:29:52,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-09-21 10:29:52,005 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-09-21 10:29:52,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:52,006 INFO L225 Difference]: With dead ends: 55 [2020-09-21 10:29:52,006 INFO L226 Difference]: Without dead ends: 50 [2020-09-21 10:29:52,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-09-21 10:29:52,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-09-21 10:29:52,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-09-21 10:29:52,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-21 10:29:52,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-09-21 10:29:52,011 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-09-21 10:29:52,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:52,012 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-09-21 10:29:52,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-09-21 10:29:52,012 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-09-21 10:29:52,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-09-21 10:29:52,013 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:52,013 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:52,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-09-21 10:29:52,013 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:52,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:52,013 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-09-21 10:29:52,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:52,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [593134335] [2020-09-21 10:29:52,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:52,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:53,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:53,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:53,520 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:53,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [593134335] [2020-09-21 10:29:53,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:53,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-09-21 10:29:53,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245469048] [2020-09-21 10:29:53,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-09-21 10:29:53,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:53,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-09-21 10:29:53,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-09-21 10:29:53,523 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-09-21 10:29:54,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:54,787 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-09-21 10:29:54,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-09-21 10:29:54,788 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-09-21 10:29:54,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:54,789 INFO L225 Difference]: With dead ends: 56 [2020-09-21 10:29:54,789 INFO L226 Difference]: Without dead ends: 51 [2020-09-21 10:29:54,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-09-21 10:29:54,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-09-21 10:29:54,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-09-21 10:29:54,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-09-21 10:29:54,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-09-21 10:29:54,794 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-09-21 10:29:54,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:54,795 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-09-21 10:29:54,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-09-21 10:29:54,795 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-09-21 10:29:54,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-09-21 10:29:54,796 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:54,796 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:54,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-09-21 10:29:54,796 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:54,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:54,796 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-09-21 10:29:54,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:54,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1737092680] [2020-09-21 10:29:54,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:54,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:56,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:56,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:56,377 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:56,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1737092680] [2020-09-21 10:29:56,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:56,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-09-21 10:29:56,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182326506] [2020-09-21 10:29:56,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-09-21 10:29:56,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:56,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-09-21 10:29:56,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-09-21 10:29:56,380 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-09-21 10:29:57,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:29:57,695 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-09-21 10:29:57,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-09-21 10:29:57,696 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-09-21 10:29:57,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:29:57,697 INFO L225 Difference]: With dead ends: 57 [2020-09-21 10:29:57,697 INFO L226 Difference]: Without dead ends: 52 [2020-09-21 10:29:57,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-09-21 10:29:57,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-09-21 10:29:57,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-09-21 10:29:57,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-09-21 10:29:57,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-09-21 10:29:57,702 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-09-21 10:29:57,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:29:57,703 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-09-21 10:29:57,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-09-21 10:29:57,703 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-09-21 10:29:57,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-09-21 10:29:57,703 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:29:57,703 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:29:57,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-09-21 10:29:57,704 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:29:57,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:29:57,704 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-09-21 10:29:57,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:29:57,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1820848365] [2020-09-21 10:29:57,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:29:57,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:59,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:29:59,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:29:59,218 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:29:59,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1820848365] [2020-09-21 10:29:59,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:29:59,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-09-21 10:29:59,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909940080] [2020-09-21 10:29:59,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-09-21 10:29:59,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:29:59,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-09-21 10:29:59,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-09-21 10:29:59,220 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-09-21 10:30:00,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:00,588 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-09-21 10:30:00,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-09-21 10:30:00,588 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-09-21 10:30:00,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:00,589 INFO L225 Difference]: With dead ends: 58 [2020-09-21 10:30:00,590 INFO L226 Difference]: Without dead ends: 53 [2020-09-21 10:30:00,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-09-21 10:30:00,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-09-21 10:30:00,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-09-21 10:30:00,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-09-21 10:30:00,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-09-21 10:30:00,595 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-09-21 10:30:00,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:00,596 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-09-21 10:30:00,596 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-09-21 10:30:00,596 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-09-21 10:30:00,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-09-21 10:30:00,596 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:00,596 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:00,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-09-21 10:30:00,597 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:00,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:00,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-09-21 10:30:00,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:00,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529443693] [2020-09-21 10:30:00,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:00,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:02,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:02,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:02,207 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:02,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529443693] [2020-09-21 10:30:02,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:02,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-09-21 10:30:02,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943463285] [2020-09-21 10:30:02,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-09-21 10:30:02,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:02,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-09-21 10:30:02,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-09-21 10:30:02,209 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-09-21 10:30:03,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:03,696 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-09-21 10:30:03,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-09-21 10:30:03,697 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-09-21 10:30:03,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:03,698 INFO L225 Difference]: With dead ends: 59 [2020-09-21 10:30:03,698 INFO L226 Difference]: Without dead ends: 54 [2020-09-21 10:30:03,699 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-09-21 10:30:03,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-09-21 10:30:03,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-09-21 10:30:03,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-09-21 10:30:03,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-09-21 10:30:03,703 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-09-21 10:30:03,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:03,704 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-09-21 10:30:03,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-09-21 10:30:03,704 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-09-21 10:30:03,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-09-21 10:30:03,704 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:03,705 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:03,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-09-21 10:30:03,705 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:03,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:03,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-09-21 10:30:03,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:03,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1183891368] [2020-09-21 10:30:03,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:03,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:05,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:05,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:05,442 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:05,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1183891368] [2020-09-21 10:30:05,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:05,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-09-21 10:30:05,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357465568] [2020-09-21 10:30:05,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-09-21 10:30:05,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:05,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-09-21 10:30:05,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-09-21 10:30:05,444 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-09-21 10:30:06,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:06,984 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-09-21 10:30:06,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-09-21 10:30:06,985 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-09-21 10:30:06,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:06,985 INFO L225 Difference]: With dead ends: 60 [2020-09-21 10:30:06,985 INFO L226 Difference]: Without dead ends: 55 [2020-09-21 10:30:06,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-09-21 10:30:06,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-09-21 10:30:06,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-09-21 10:30:06,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-09-21 10:30:06,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-09-21 10:30:06,989 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-09-21 10:30:06,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:06,989 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-09-21 10:30:06,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-09-21 10:30:06,989 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-09-21 10:30:06,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-09-21 10:30:06,990 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:06,990 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:06,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-09-21 10:30:06,990 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:06,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:06,990 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-09-21 10:30:06,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:06,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1575159168] [2020-09-21 10:30:06,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:07,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:08,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:30:08,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:30:08,852 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:30:08,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1575159168] [2020-09-21 10:30:08,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:30:08,853 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-09-21 10:30:08,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338939055] [2020-09-21 10:30:08,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-09-21 10:30:08,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:30:08,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-09-21 10:30:08,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-09-21 10:30:08,854 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-09-21 10:30:10,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:30:10,511 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-09-21 10:30:10,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-09-21 10:30:10,512 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-09-21 10:30:10,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:30:10,512 INFO L225 Difference]: With dead ends: 61 [2020-09-21 10:30:10,513 INFO L226 Difference]: Without dead ends: 56 [2020-09-21 10:30:10,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-09-21 10:30:10,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-09-21 10:30:10,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-09-21 10:30:10,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-09-21 10:30:10,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-09-21 10:30:10,518 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-09-21 10:30:10,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:30:10,518 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-09-21 10:30:10,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-09-21 10:30:10,518 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-09-21 10:30:10,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-09-21 10:30:10,524 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:30:10,524 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:30:10,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-09-21 10:30:10,524 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:30:10,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:30:10,525 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-09-21 10:30:10,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:30:10,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066941933] [2020-09-21 10:30:10,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:30:10,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat