/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST --traceabstraction.additional.smt.options log-additional-information=true -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 0.1.25-177f698 [2020-08-21 22:18:15,759 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 22:18:15,762 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 22:18:15,787 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 22:18:15,788 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 22:18:15,789 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 22:18:15,790 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 22:18:15,792 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 22:18:15,793 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 22:18:15,794 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 22:18:15,795 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 22:18:15,796 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 22:18:15,797 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 22:18:15,798 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 22:18:15,799 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 22:18:15,800 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 22:18:15,801 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 22:18:15,801 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 22:18:15,803 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 22:18:15,805 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 22:18:15,807 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 22:18:15,808 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 22:18:15,811 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 22:18:15,812 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 22:18:15,816 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 22:18:15,831 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 22:18:15,832 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 22:18:15,833 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 22:18:15,834 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 22:18:15,881 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 22:18:15,881 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 22:18:15,883 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 22:18:15,884 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 22:18:15,884 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 22:18:15,884 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 22:18:15,884 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 22:18:15,885 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 22:18:15,885 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 22:18:15,885 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 22:18:15,886 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 22:18:15,886 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 22:18:15,886 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 22:18:15,887 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 22:18:15,888 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 22:18:15,888 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 22:18:15,888 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 22:18:15,888 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 22:18:15,889 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 22:18:15,889 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 22:18:15,889 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 22:18:15,889 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 22:18:15,890 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 22:18:15,890 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 22:18:15,890 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 22:18:15,890 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 22:18:15,890 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 22:18:15,890 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 22:18:15,891 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 22:18:15,891 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 -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; [2020-08-21 22:18:16,233 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 22:18:16,255 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 22:18:16,258 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 22:18:16,259 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 22:18:16,260 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 22:18:16,261 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 22:18:16,336 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5eff87a0a/b93f00728635419fb0ba3d83fcfa0b31/FLAG4cdfc9f68 [2020-08-21 22:18:16,803 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 22:18:16,804 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-21 22:18:16,810 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5eff87a0a/b93f00728635419fb0ba3d83fcfa0b31/FLAG4cdfc9f68 [2020-08-21 22:18:17,190 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5eff87a0a/b93f00728635419fb0ba3d83fcfa0b31 [2020-08-21 22:18:17,200 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 22:18:17,202 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 22:18:17,204 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 22:18:17,204 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 22:18:17,208 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 22:18:17,209 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:18:17" (1/1) ... [2020-08-21 22:18:17,213 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@674bda66 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:17, skipping insertion in model container [2020-08-21 22:18:17,213 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:18:17" (1/1) ... [2020-08-21 22:18:17,222 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 22:18:17,243 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 22:18:17,418 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:18:17,423 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 22:18:17,438 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:18:17,451 INFO L208 MainTranslator]: Completed translation [2020-08-21 22:18:17,452 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:17 WrapperNode [2020-08-21 22:18:17,452 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 22:18:17,453 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 22:18:17,453 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 22:18:17,453 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 22:18:17,463 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:17" (1/1) ... [2020-08-21 22:18:17,463 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:17" (1/1) ... [2020-08-21 22:18:17,468 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:17" (1/1) ... [2020-08-21 22:18:17,468 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:17" (1/1) ... [2020-08-21 22:18:17,471 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:17" (1/1) ... [2020-08-21 22:18:17,553 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:17" (1/1) ... [2020-08-21 22:18:17,554 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:17" (1/1) ... [2020-08-21 22:18:17,556 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 22:18:17,556 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 22:18:17,556 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 22:18:17,556 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 22:18:17,557 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:17" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 22:18:17,626 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 22:18:17,626 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 22:18:17,627 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 22:18:17,627 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 22:18:17,627 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 22:18:17,627 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 22:18:17,627 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 22:18:17,627 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 22:18:17,628 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 22:18:17,788 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 22:18:17,788 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 22:18:17,792 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:18:17 BoogieIcfgContainer [2020-08-21 22:18:17,792 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 22:18:17,793 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 22:18:17,793 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 22:18:17,797 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 22:18:17,797 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 10:18:17" (1/3) ... [2020-08-21 22:18:17,798 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b6c5779 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:18:17, skipping insertion in model container [2020-08-21 22:18:17,798 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:18:17" (2/3) ... [2020-08-21 22:18:17,799 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@b6c5779 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:18:17, skipping insertion in model container [2020-08-21 22:18:17,799 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:18:17" (3/3) ... [2020-08-21 22:18:17,801 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-21 22:18:17,812 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 22:18:17,819 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 22:18:17,834 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 22:18:17,860 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 22:18:17,860 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 22:18:17,860 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 22:18:17,860 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 22:18:17,860 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 22:18:17,861 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 22:18:17,861 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 22:18:17,861 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 22:18:17,877 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 22:18:17,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 22:18:17,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:17,884 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:17,885 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:17,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:17,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 22:18:17,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:17,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1996975929] [2020-08-21 22:18:17,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:18,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:18,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1996975929] [2020-08-21 22:18:18,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:18:18,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 22:18:18,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844683086] [2020-08-21 22:18:18,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 22:18:18,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:18,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 22:18:18,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 22:18:18,177 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 22:18:18,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:18,222 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 22:18:18,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 22:18:18,224 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 22:18:18,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:18,240 INFO L225 Difference]: With dead ends: 29 [2020-08-21 22:18:18,240 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 22:18:18,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 22:18:18,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 22:18:18,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 22:18:18,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 22:18:18,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 22:18:18,276 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 22:18:18,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:18,276 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 22:18:18,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 22:18:18,277 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 22:18:18,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 22:18:18,278 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:18,278 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:18,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 22:18:18,279 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:18,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:18,280 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 22:18:18,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:18,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244314407] [2020-08-21 22:18:18,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:18,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,376 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:18,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244314407] [2020-08-21 22:18:18,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:18,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 22:18:18,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867656322] [2020-08-21 22:18:18,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 22:18:18,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:18,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 22:18:18,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 22:18:18,382 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 22:18:18,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:18,401 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 22:18:18,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 22:18:18,402 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 22:18:18,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:18,403 INFO L225 Difference]: With dead ends: 18 [2020-08-21 22:18:18,404 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 22:18:18,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 22:18:18,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 22:18:18,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 22:18:18,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 22:18:18,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 22:18:18,411 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 22:18:18,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:18,412 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 22:18:18,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 22:18:18,412 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 22:18:18,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 22:18:18,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:18,413 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:18,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 22:18:18,413 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:18,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:18,414 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 22:18:18,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:18,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1147799378] [2020-08-21 22:18:18,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:18,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,548 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:18,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1147799378] [2020-08-21 22:18:18,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:18,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 22:18:18,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354224090] [2020-08-21 22:18:18,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 22:18:18,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:18,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 22:18:18,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:18:18,551 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 22:18:18,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:18,576 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 22:18:18,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 22:18:18,577 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 22:18:18,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:18,578 INFO L225 Difference]: With dead ends: 19 [2020-08-21 22:18:18,578 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 22:18:18,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:18:18,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 22:18:18,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 22:18:18,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 22:18:18,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 22:18:18,584 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 22:18:18,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:18,584 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 22:18:18,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 22:18:18,585 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 22:18:18,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 22:18:18,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:18,586 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:18,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 22:18:18,586 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:18,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:18,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 22:18:18,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:18,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398616090] [2020-08-21 22:18:18,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:18,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,697 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:18,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398616090] [2020-08-21 22:18:18,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:18,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 22:18:18,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131590413] [2020-08-21 22:18:18,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 22:18:18,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:18,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 22:18:18,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:18:18,700 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 22:18:18,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:18,728 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 22:18:18,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 22:18:18,729 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 22:18:18,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:18,729 INFO L225 Difference]: With dead ends: 20 [2020-08-21 22:18:18,730 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 22:18:18,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:18:18,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 22:18:18,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 22:18:18,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 22:18:18,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 22:18:18,736 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 22:18:18,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:18,736 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 22:18:18,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 22:18:18,736 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 22:18:18,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 22:18:18,737 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:18,737 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:18,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 22:18:18,738 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:18,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:18,738 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 22:18:18,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:18,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [815225440] [2020-08-21 22:18:18,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:18,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,864 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:18,864 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [815225440] [2020-08-21 22:18:18,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:18,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 22:18:18,865 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386511210] [2020-08-21 22:18:18,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 22:18:18,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:18,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 22:18:18,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:18:18,867 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 22:18:18,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:18,906 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 22:18:18,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 22:18:18,907 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 22:18:18,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:18,908 INFO L225 Difference]: With dead ends: 21 [2020-08-21 22:18:18,908 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 22:18:18,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:18:18,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 22:18:18,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 22:18:18,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 22:18:18,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 22:18:18,915 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 22:18:18,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:18,916 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 22:18:18,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 22:18:18,917 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 22:18:18,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 22:18:18,917 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:18,918 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:18,918 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 22:18:18,918 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:18,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:18,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 22:18:18,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:18,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835750872] [2020-08-21 22:18:18,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:19,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,102 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:19,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [835750872] [2020-08-21 22:18:19,103 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:19,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 22:18:19,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991633973] [2020-08-21 22:18:19,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 22:18:19,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:19,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 22:18:19,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 22:18:19,105 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 22:18:19,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:19,153 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 22:18:19,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 22:18:19,154 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 22:18:19,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:19,155 INFO L225 Difference]: With dead ends: 22 [2020-08-21 22:18:19,155 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 22:18:19,156 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 [2020-08-21 22:18:19,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 22:18:19,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 22:18:19,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 22:18:19,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 22:18:19,161 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 22:18:19,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:19,162 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 22:18:19,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 22:18:19,162 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 22:18:19,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 22:18:19,163 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:19,163 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:19,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 22:18:19,163 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:19,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:19,164 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 22:18:19,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:19,164 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497559] [2020-08-21 22:18:19,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:19,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:19,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,314 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:19,314 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497559] [2020-08-21 22:18:19,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:19,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 22:18:19,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020794763] [2020-08-21 22:18:19,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 22:18:19,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:19,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 22:18:19,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:18:19,317 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 22:18:19,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:19,368 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 22:18:19,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 22:18:19,369 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 22:18:19,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:19,370 INFO L225 Difference]: With dead ends: 23 [2020-08-21 22:18:19,370 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 22:18:19,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:18:19,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 22:18:19,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 22:18:19,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 22:18:19,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 22:18:19,376 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 22:18:19,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:19,377 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 22:18:19,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 22:18:19,377 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 22:18:19,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 22:18:19,378 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:19,378 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:19,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 22:18:19,378 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:19,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:19,379 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 22:18:19,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:19,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423585322] [2020-08-21 22:18:19,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:19,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:19,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,522 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:19,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423585322] [2020-08-21 22:18:19,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:19,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 22:18:19,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290113445] [2020-08-21 22:18:19,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 22:18:19,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:19,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 22:18:19,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 22:18:19,524 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 22:18:19,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:19,580 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 22:18:19,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 22:18:19,581 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 22:18:19,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:19,581 INFO L225 Difference]: With dead ends: 24 [2020-08-21 22:18:19,582 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 22:18:19,582 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 [2020-08-21 22:18:19,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 22:18:19,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 22:18:19,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 22:18:19,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 22:18:19,588 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 22:18:19,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:19,588 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 22:18:19,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 22:18:19,588 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 22:18:19,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 22:18:19,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:19,589 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:19,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 22:18:19,590 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:19,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:19,590 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 22:18:19,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:19,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36713045] [2020-08-21 22:18:19,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:19,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:19,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,763 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:19,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36713045] [2020-08-21 22:18:19,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:19,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 22:18:19,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520271387] [2020-08-21 22:18:19,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 22:18:19,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:19,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 22:18:19,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:18:19,767 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 22:18:19,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:19,846 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 22:18:19,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 22:18:19,846 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 22:18:19,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:19,847 INFO L225 Difference]: With dead ends: 25 [2020-08-21 22:18:19,847 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 22:18:19,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:18:19,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 22:18:19,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 22:18:19,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 22:18:19,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 22:18:19,853 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 22:18:19,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:19,853 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 22:18:19,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 22:18:19,854 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 22:18:19,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 22:18:19,854 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:19,854 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:19,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 22:18:19,855 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:19,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:19,855 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 22:18:19,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:19,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270715759] [2020-08-21 22:18:19,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:19,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:20,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:20,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:20,026 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:20,026 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270715759] [2020-08-21 22:18:20,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:20,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 22:18:20,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216363864] [2020-08-21 22:18:20,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 22:18:20,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:20,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 22:18:20,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 22:18:20,029 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 22:18:20,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:20,114 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 22:18:20,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 22:18:20,115 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 22:18:20,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:20,116 INFO L225 Difference]: With dead ends: 26 [2020-08-21 22:18:20,116 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 22:18:20,117 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 22:18:20,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 22:18:20,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 22:18:20,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 22:18:20,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 22:18:20,133 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 22:18:20,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:20,133 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 22:18:20,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 22:18:20,134 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 22:18:20,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 22:18:20,134 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:20,134 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:20,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 22:18:20,135 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:20,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:20,135 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 22:18:20,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:20,136 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1182991584] [2020-08-21 22:18:20,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:20,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:20,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:20,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:20,326 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:20,326 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1182991584] [2020-08-21 22:18:20,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:20,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 22:18:20,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341162883] [2020-08-21 22:18:20,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 22:18:20,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:20,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 22:18:20,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:18:20,329 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 22:18:20,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:20,433 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 22:18:20,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 22:18:20,435 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 22:18:20,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:20,436 INFO L225 Difference]: With dead ends: 27 [2020-08-21 22:18:20,436 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 22:18:20,436 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:18:20,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 22:18:20,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 22:18:20,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 22:18:20,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 22:18:20,449 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 22:18:20,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:20,449 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 22:18:20,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 22:18:20,450 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 22:18:20,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 22:18:20,451 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:20,451 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:20,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 22:18:20,452 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:20,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:20,452 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 22:18:20,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:20,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263735514] [2020-08-21 22:18:20,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:20,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:20,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:20,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:20,668 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:20,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263735514] [2020-08-21 22:18:20,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:20,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 22:18:20,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758151904] [2020-08-21 22:18:20,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 22:18:20,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:20,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 22:18:20,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 22:18:20,671 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 22:18:20,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:20,778 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 22:18:20,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 22:18:20,779 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 22:18:20,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:20,780 INFO L225 Difference]: With dead ends: 28 [2020-08-21 22:18:20,780 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 22:18:20,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 22:18:20,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 22:18:20,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 22:18:20,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 22:18:20,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 22:18:20,785 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 22:18:20,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:20,786 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 22:18:20,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 22:18:20,786 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 22:18:20,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 22:18:20,787 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:20,787 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:20,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 22:18:20,787 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:20,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:20,788 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 22:18:20,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:20,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941970594] [2020-08-21 22:18:20,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:20,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:21,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,030 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:21,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941970594] [2020-08-21 22:18:21,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:21,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 22:18:21,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131635787] [2020-08-21 22:18:21,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 22:18:21,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:21,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 22:18:21,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 22:18:21,036 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 22:18:21,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:21,165 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 22:18:21,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 22:18:21,165 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 22:18:21,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:21,166 INFO L225 Difference]: With dead ends: 29 [2020-08-21 22:18:21,166 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 22:18:21,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 22:18:21,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 22:18:21,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 22:18:21,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 22:18:21,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 22:18:21,175 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 22:18:21,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:21,175 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 22:18:21,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 22:18:21,176 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 22:18:21,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 22:18:21,176 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:21,176 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:21,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 22:18:21,178 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:21,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:21,178 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 22:18:21,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:21,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968721989] [2020-08-21 22:18:21,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:21,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:21,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,502 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:21,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968721989] [2020-08-21 22:18:21,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:21,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 22:18:21,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581839586] [2020-08-21 22:18:21,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 22:18:21,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:21,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 22:18:21,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 22:18:21,504 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 22:18:21,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:21,672 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 22:18:21,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 22:18:21,675 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 22:18:21,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:21,675 INFO L225 Difference]: With dead ends: 30 [2020-08-21 22:18:21,676 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 22:18:21,676 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 [2020-08-21 22:18:21,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 22:18:21,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 22:18:21,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 22:18:21,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 22:18:21,682 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 22:18:21,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:21,686 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 22:18:21,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 22:18:21,686 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 22:18:21,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 22:18:21,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:21,687 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:21,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 22:18:21,688 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:21,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:21,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 22:18:21,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:21,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924720560] [2020-08-21 22:18:21,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:21,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:21,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,962 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:21,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924720560] [2020-08-21 22:18:21,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:21,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 22:18:21,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024897090] [2020-08-21 22:18:21,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 22:18:21,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:21,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 22:18:21,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 22:18:21,966 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 22:18:22,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:22,129 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 22:18:22,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 22:18:22,130 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 22:18:22,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:22,131 INFO L225 Difference]: With dead ends: 31 [2020-08-21 22:18:22,131 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 22:18:22,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 22:18:22,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 22:18:22,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 22:18:22,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 22:18:22,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 22:18:22,137 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 22:18:22,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:22,137 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 22:18:22,137 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 22:18:22,137 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 22:18:22,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 22:18:22,138 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:22,138 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:22,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 22:18:22,139 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:22,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:22,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 22:18:22,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:22,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [972652386] [2020-08-21 22:18:22,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:22,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:22,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:22,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:22,391 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:22,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [972652386] [2020-08-21 22:18:22,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:22,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 22:18:22,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288346430] [2020-08-21 22:18:22,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 22:18:22,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:22,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 22:18:22,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 22:18:22,394 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 22:18:22,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:22,574 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 22:18:22,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 22:18:22,575 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 22:18:22,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:22,576 INFO L225 Difference]: With dead ends: 32 [2020-08-21 22:18:22,576 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 22:18:22,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 22:18:22,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 22:18:22,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 22:18:22,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 22:18:22,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 22:18:22,582 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 22:18:22,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:22,582 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 22:18:22,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 22:18:22,582 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 22:18:22,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 22:18:22,583 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:22,583 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:22,583 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 22:18:22,584 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:22,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:22,584 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 22:18:22,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:22,584 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1347546204] [2020-08-21 22:18:22,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:22,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:22,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:22,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:22,900 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:22,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1347546204] [2020-08-21 22:18:22,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:22,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 22:18:22,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327339031] [2020-08-21 22:18:22,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 22:18:22,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:22,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 22:18:22,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 22:18:22,903 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 22:18:23,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:23,132 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 22:18:23,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 22:18:23,133 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 22:18:23,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:23,134 INFO L225 Difference]: With dead ends: 33 [2020-08-21 22:18:23,134 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 22:18:23,135 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 22:18:23,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 22:18:23,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 22:18:23,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 22:18:23,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 22:18:23,140 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 22:18:23,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:23,140 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 22:18:23,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 22:18:23,140 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 22:18:23,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 22:18:23,142 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:23,142 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:23,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 22:18:23,143 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:23,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:23,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 22:18:23,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:23,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1385915350] [2020-08-21 22:18:23,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:23,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:23,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:23,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:23,448 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:23,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1385915350] [2020-08-21 22:18:23,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:23,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 22:18:23,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373864782] [2020-08-21 22:18:23,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 22:18:23,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:23,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 22:18:23,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 22:18:23,450 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 22:18:23,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:23,697 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 22:18:23,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 22:18:23,698 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 22:18:23,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:23,699 INFO L225 Difference]: With dead ends: 34 [2020-08-21 22:18:23,699 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 22:18:23,699 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 22:18:23,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 22:18:23,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 22:18:23,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 22:18:23,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 22:18:23,717 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 22:18:23,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:23,717 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 22:18:23,717 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 22:18:23,717 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 22:18:23,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 22:18:23,718 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:23,718 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:23,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 22:18:23,718 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:23,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:23,720 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 22:18:23,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:23,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688811824] [2020-08-21 22:18:23,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:23,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:24,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:24,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:24,080 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:24,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1688811824] [2020-08-21 22:18:24,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:24,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 22:18:24,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581545948] [2020-08-21 22:18:24,083 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 22:18:24,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:24,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 22:18:24,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 22:18:24,084 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 22:18:24,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:24,341 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 22:18:24,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 22:18:24,341 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 22:18:24,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:24,342 INFO L225 Difference]: With dead ends: 35 [2020-08-21 22:18:24,342 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 22:18:24,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 22:18:24,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 22:18:24,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 22:18:24,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 22:18:24,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 22:18:24,355 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 22:18:24,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:24,355 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 22:18:24,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 22:18:24,355 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 22:18:24,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 22:18:24,359 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:24,359 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:24,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 22:18:24,360 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:24,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:24,360 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 22:18:24,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:24,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [425184234] [2020-08-21 22:18:24,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:24,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:24,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:24,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:24,736 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:24,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [425184234] [2020-08-21 22:18:24,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:24,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 22:18:24,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179668244] [2020-08-21 22:18:24,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 22:18:24,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:24,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 22:18:24,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 22:18:24,738 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 22:18:24,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:24,999 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 22:18:25,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 22:18:25,000 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 22:18:25,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:25,001 INFO L225 Difference]: With dead ends: 36 [2020-08-21 22:18:25,001 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 22:18:25,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 22:18:25,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 22:18:25,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 22:18:25,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 22:18:25,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 22:18:25,010 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 22:18:25,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:25,010 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 22:18:25,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 22:18:25,011 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 22:18:25,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 22:18:25,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:25,012 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:25,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 22:18:25,012 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:25,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:25,012 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 22:18:25,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:25,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [719310590] [2020-08-21 22:18:25,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:25,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:25,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:25,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:25,422 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:25,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [719310590] [2020-08-21 22:18:25,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:25,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 22:18:25,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316646126] [2020-08-21 22:18:25,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 22:18:25,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:25,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 22:18:25,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 22:18:25,424 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 22:18:25,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:25,730 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 22:18:25,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 22:18:25,730 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 22:18:25,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:25,731 INFO L225 Difference]: With dead ends: 37 [2020-08-21 22:18:25,731 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 22:18:25,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 22:18:25,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 22:18:25,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 22:18:25,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 22:18:25,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 22:18:25,737 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 22:18:25,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:25,737 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 22:18:25,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 22:18:25,737 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 22:18:25,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 22:18:25,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:25,738 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:25,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 22:18:25,738 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:25,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:25,739 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 22:18:25,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:25,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [643607376] [2020-08-21 22:18:25,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:25,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:26,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:26,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:26,193 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:26,194 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [643607376] [2020-08-21 22:18:26,194 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:26,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 22:18:26,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277122764] [2020-08-21 22:18:26,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 22:18:26,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:26,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 22:18:26,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 22:18:26,196 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 22:18:26,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:26,543 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 22:18:26,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 22:18:26,546 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 22:18:26,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:26,547 INFO L225 Difference]: With dead ends: 38 [2020-08-21 22:18:26,547 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 22:18:26,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 22:18:26,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 22:18:26,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 22:18:26,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 22:18:26,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 22:18:26,558 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 22:18:26,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:26,558 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 22:18:26,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 22:18:26,558 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 22:18:26,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 22:18:26,559 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:26,559 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:26,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 22:18:26,560 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:26,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:26,560 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 22:18:26,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:26,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567493301] [2020-08-21 22:18:26,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:26,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:27,057 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:27,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:27,061 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:27,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567493301] [2020-08-21 22:18:27,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:27,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 22:18:27,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634732282] [2020-08-21 22:18:27,062 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 22:18:27,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:27,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 22:18:27,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 22:18:27,063 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 22:18:27,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:27,420 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 22:18:27,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 22:18:27,421 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 22:18:27,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:27,421 INFO L225 Difference]: With dead ends: 39 [2020-08-21 22:18:27,422 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 22:18:27,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 22:18:27,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 22:18:27,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 22:18:27,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 22:18:27,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 22:18:27,427 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 22:18:27,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:27,427 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 22:18:27,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 22:18:27,427 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 22:18:27,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 22:18:27,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:27,428 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:27,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 22:18:27,428 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:27,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:27,429 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 22:18:27,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:27,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [764807252] [2020-08-21 22:18:27,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:27,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:27,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:27,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:27,946 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:27,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [764807252] [2020-08-21 22:18:27,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:27,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 22:18:27,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4165502] [2020-08-21 22:18:27,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 22:18:27,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:27,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 22:18:27,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 22:18:27,948 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 22:18:28,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:28,336 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 22:18:28,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 22:18:28,336 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 22:18:28,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:28,337 INFO L225 Difference]: With dead ends: 40 [2020-08-21 22:18:28,337 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 22:18:28,338 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 22:18:28,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 22:18:28,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 22:18:28,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 22:18:28,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 22:18:28,342 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 22:18:28,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:28,342 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 22:18:28,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 22:18:28,342 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 22:18:28,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 22:18:28,343 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:28,343 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:28,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 22:18:28,343 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:28,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:28,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 22:18:28,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:28,344 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1903143880] [2020-08-21 22:18:28,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:28,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:28,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:28,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:28,865 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:28,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1903143880] [2020-08-21 22:18:28,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:28,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 22:18:28,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334151362] [2020-08-21 22:18:28,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 22:18:28,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:28,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 22:18:28,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 22:18:28,868 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 22:18:29,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:29,220 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 22:18:29,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 22:18:29,221 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 22:18:29,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:29,222 INFO L225 Difference]: With dead ends: 41 [2020-08-21 22:18:29,222 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 22:18:29,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 22:18:29,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 22:18:29,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 22:18:29,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 22:18:29,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 22:18:29,227 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 22:18:29,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:29,227 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 22:18:29,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 22:18:29,228 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 22:18:29,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 22:18:29,229 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:29,229 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:29,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 22:18:29,229 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:29,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:29,230 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 22:18:29,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:29,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [336267883] [2020-08-21 22:18:29,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:29,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:29,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:29,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:29,750 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:29,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [336267883] [2020-08-21 22:18:29,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:29,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 22:18:29,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364775056] [2020-08-21 22:18:29,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 22:18:29,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:29,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 22:18:29,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 22:18:29,753 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 22:18:30,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:30,165 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 22:18:30,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 22:18:30,165 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 22:18:30,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:30,166 INFO L225 Difference]: With dead ends: 42 [2020-08-21 22:18:30,166 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 22:18:30,168 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 22:18:30,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 22:18:30,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 22:18:30,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 22:18:30,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 22:18:30,173 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 22:18:30,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:30,174 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 22:18:30,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 22:18:30,174 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 22:18:30,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 22:18:30,174 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:30,175 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:30,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 22:18:30,175 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:30,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:30,175 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 22:18:30,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:30,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [866264562] [2020-08-21 22:18:30,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:30,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:30,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:30,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:30,758 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:30,759 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [866264562] [2020-08-21 22:18:30,759 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:30,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 22:18:30,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814582286] [2020-08-21 22:18:30,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 22:18:30,760 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:30,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 22:18:30,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 22:18:30,761 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 22:18:31,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:31,235 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 22:18:31,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 22:18:31,236 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 22:18:31,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:31,237 INFO L225 Difference]: With dead ends: 43 [2020-08-21 22:18:31,237 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 22:18:31,237 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 22:18:31,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 22:18:31,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 22:18:31,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 22:18:31,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 22:18:31,242 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 22:18:31,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:31,242 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 22:18:31,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 22:18:31,242 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 22:18:31,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 22:18:31,243 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:31,243 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:31,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 22:18:31,243 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:31,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:31,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 22:18:31,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:31,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548104688] [2020-08-21 22:18:31,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:31,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:31,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:31,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:31,911 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:31,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548104688] [2020-08-21 22:18:31,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:31,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 22:18:31,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541428012] [2020-08-21 22:18:31,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 22:18:31,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:31,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 22:18:31,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 22:18:31,913 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 22:18:32,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:32,420 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 22:18:32,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 22:18:32,421 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 22:18:32,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:32,421 INFO L225 Difference]: With dead ends: 44 [2020-08-21 22:18:32,421 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 22:18:32,422 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 22:18:32,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 22:18:32,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 22:18:32,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 22:18:32,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 22:18:32,426 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 22:18:32,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:32,426 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 22:18:32,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 22:18:32,426 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 22:18:32,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 22:18:32,427 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:32,427 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:32,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 22:18:32,427 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:32,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:32,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 22:18:32,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:32,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998893831] [2020-08-21 22:18:32,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:32,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:33,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:33,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:33,070 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:33,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998893831] [2020-08-21 22:18:33,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:33,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 22:18:33,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526834457] [2020-08-21 22:18:33,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 22:18:33,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:33,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 22:18:33,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 22:18:33,073 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 22:18:33,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:33,615 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 22:18:33,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 22:18:33,616 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 22:18:33,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:33,617 INFO L225 Difference]: With dead ends: 45 [2020-08-21 22:18:33,617 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 22:18:33,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 22:18:33,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 22:18:33,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 22:18:33,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 22:18:33,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 22:18:33,623 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 22:18:33,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:33,623 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 22:18:33,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 22:18:33,623 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 22:18:33,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 22:18:33,624 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:33,624 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:33,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 22:18:33,624 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:33,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:33,624 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 22:18:33,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:33,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1186480566] [2020-08-21 22:18:33,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:33,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:34,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:34,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:34,348 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:34,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1186480566] [2020-08-21 22:18:34,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:34,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 22:18:34,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808316312] [2020-08-21 22:18:34,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 22:18:34,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:34,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 22:18:34,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 22:18:34,350 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 22:18:34,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:34,945 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 22:18:34,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 22:18:34,953 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 22:18:34,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:34,954 INFO L225 Difference]: With dead ends: 46 [2020-08-21 22:18:34,954 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 22:18:34,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 22:18:34,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 22:18:34,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 22:18:34,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 22:18:34,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 22:18:34,962 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 22:18:34,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:34,963 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 22:18:34,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 22:18:34,963 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 22:18:34,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 22:18:34,963 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:34,963 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:34,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 22:18:34,964 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:34,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:34,964 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 22:18:34,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:34,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [544071733] [2020-08-21 22:18:34,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:34,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:35,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:35,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:35,740 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:35,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [544071733] [2020-08-21 22:18:35,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:35,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 22:18:35,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252051793] [2020-08-21 22:18:35,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 22:18:35,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:35,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 22:18:35,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 22:18:35,742 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 22:18:36,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:36,359 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 22:18:36,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 22:18:36,359 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 22:18:36,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:36,360 INFO L225 Difference]: With dead ends: 47 [2020-08-21 22:18:36,360 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 22:18:36,362 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 22:18:36,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 22:18:36,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 22:18:36,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 22:18:36,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 22:18:36,366 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 22:18:36,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:36,367 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 22:18:36,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 22:18:36,367 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 22:18:36,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 22:18:36,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:36,368 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:36,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 22:18:36,368 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:36,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:36,369 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 22:18:36,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:36,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116558327] [2020-08-21 22:18:36,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:36,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:37,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:37,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:37,235 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:37,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116558327] [2020-08-21 22:18:37,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:37,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 22:18:37,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652517140] [2020-08-21 22:18:37,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 22:18:37,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:37,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 22:18:37,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 22:18:37,237 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 22:18:37,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:37,929 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 22:18:37,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 22:18:37,930 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 22:18:37,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:37,931 INFO L225 Difference]: With dead ends: 48 [2020-08-21 22:18:37,931 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 22:18:37,932 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 [2020-08-21 22:18:37,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 22:18:37,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 22:18:37,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 22:18:37,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 22:18:37,936 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 22:18:37,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:37,936 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 22:18:37,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 22:18:37,936 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 22:18:37,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 22:18:37,937 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:37,937 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:37,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 22:18:37,937 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:37,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:37,938 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 22:18:37,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:37,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1309094421] [2020-08-21 22:18:37,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:37,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:38,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:38,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:38,803 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:38,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1309094421] [2020-08-21 22:18:38,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:38,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 22:18:38,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834869363] [2020-08-21 22:18:38,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 22:18:38,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:38,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 22:18:38,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 22:18:38,805 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 22:18:39,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:39,542 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 22:18:39,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 22:18:39,543 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 22:18:39,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:39,544 INFO L225 Difference]: With dead ends: 49 [2020-08-21 22:18:39,544 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 22:18:39,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 22:18:39,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 22:18:39,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 22:18:39,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 22:18:39,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 22:18:39,550 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 22:18:39,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:39,550 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 22:18:39,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 22:18:39,550 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 22:18:39,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 22:18:39,551 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:39,551 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:39,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 22:18:39,551 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:39,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:39,552 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 22:18:39,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:39,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200223225] [2020-08-21 22:18:39,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:39,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:40,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:40,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:40,473 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:40,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200223225] [2020-08-21 22:18:40,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:40,474 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 22:18:40,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249425715] [2020-08-21 22:18:40,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 22:18:40,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:40,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 22:18:40,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 22:18:40,475 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 22:18:41,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:41,233 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 22:18:41,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 22:18:41,233 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 22:18:41,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:41,234 INFO L225 Difference]: With dead ends: 50 [2020-08-21 22:18:41,234 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 22:18:41,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 22:18:41,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 22:18:41,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 22:18:41,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 22:18:41,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 22:18:41,239 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 22:18:41,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:41,239 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 22:18:41,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 22:18:41,240 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 22:18:41,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 22:18:41,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:41,240 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:41,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 22:18:41,241 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:41,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:41,241 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 22:18:41,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:41,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2137177603] [2020-08-21 22:18:41,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:41,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:42,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:42,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:42,274 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:42,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2137177603] [2020-08-21 22:18:42,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:42,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 22:18:42,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545482327] [2020-08-21 22:18:42,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 22:18:42,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:42,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 22:18:42,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 22:18:42,277 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 22:18:43,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:43,086 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 22:18:43,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 22:18:43,087 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 22:18:43,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:43,088 INFO L225 Difference]: With dead ends: 51 [2020-08-21 22:18:43,088 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 22:18:43,089 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 22:18:43,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 22:18:43,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 22:18:43,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 22:18:43,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 22:18:43,093 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 22:18:43,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:43,093 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 22:18:43,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 22:18:43,093 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 22:18:43,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 22:18:43,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:43,094 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:43,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 22:18:43,094 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:43,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:43,095 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 22:18:43,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:43,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1024395490] [2020-08-21 22:18:43,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:43,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:44,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:44,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:44,077 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:44,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1024395490] [2020-08-21 22:18:44,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:44,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 22:18:44,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073683879] [2020-08-21 22:18:44,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 22:18:44,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:44,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 22:18:44,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 22:18:44,079 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 22:18:44,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:44,926 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 22:18:44,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 22:18:44,927 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 22:18:44,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:44,928 INFO L225 Difference]: With dead ends: 52 [2020-08-21 22:18:44,928 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 22:18:44,929 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 22:18:44,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 22:18:44,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 22:18:44,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 22:18:44,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 22:18:44,934 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 22:18:44,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:44,935 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 22:18:44,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 22:18:44,935 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 22:18:44,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 22:18:44,935 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:44,935 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:44,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 22:18:44,936 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:44,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:44,936 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 22:18:44,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:44,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167412595] [2020-08-21 22:18:44,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:44,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:45,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:45,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:45,953 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:45,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167412595] [2020-08-21 22:18:45,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:45,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 22:18:45,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106441444] [2020-08-21 22:18:45,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 22:18:45,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:45,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 22:18:45,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 22:18:45,955 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 22:18:46,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:46,845 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 22:18:46,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 22:18:46,847 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 22:18:46,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:46,848 INFO L225 Difference]: With dead ends: 53 [2020-08-21 22:18:46,848 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 22:18:46,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 22:18:46,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 22:18:46,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 22:18:46,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 22:18:46,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 22:18:46,853 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 22:18:46,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:46,853 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 22:18:46,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 22:18:46,853 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 22:18:46,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 22:18:46,854 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:46,854 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:46,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 22:18:46,854 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:46,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:46,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 22:18:46,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:46,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1728108190] [2020-08-21 22:18:46,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:46,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:48,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:48,005 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:48,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1728108190] [2020-08-21 22:18:48,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:48,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 22:18:48,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646017376] [2020-08-21 22:18:48,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 22:18:48,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:48,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 22:18:48,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 22:18:48,008 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 22:18:48,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:48,956 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 22:18:48,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 22:18:48,956 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 22:18:48,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:48,957 INFO L225 Difference]: With dead ends: 54 [2020-08-21 22:18:48,957 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 22:18:48,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 22:18:48,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 22:18:48,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 22:18:48,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 22:18:48,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 22:18:48,963 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 22:18:48,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:48,963 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 22:18:48,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 22:18:48,963 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 22:18:48,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 22:18:48,965 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:48,965 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:48,965 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 22:18:48,965 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:48,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:48,966 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 22:18:48,966 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:48,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [322679382] [2020-08-21 22:18:48,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:48,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:50,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:50,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:50,142 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:50,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [322679382] [2020-08-21 22:18:50,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:50,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 22:18:50,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547635277] [2020-08-21 22:18:50,143 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 22:18:50,143 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:50,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 22:18:50,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 22:18:50,145 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 22:18:51,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:51,186 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 22:18:51,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 22:18:51,187 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 22:18:51,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:51,188 INFO L225 Difference]: With dead ends: 55 [2020-08-21 22:18:51,188 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 22:18:51,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 22:18:51,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 22:18:51,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 22:18:51,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 22:18:51,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 22:18:51,193 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 22:18:51,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:51,194 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 22:18:51,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 22:18:51,194 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 22:18:51,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 22:18:51,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:51,194 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:51,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 22:18:51,195 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:51,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:51,195 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 22:18:51,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:51,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [793169535] [2020-08-21 22:18:51,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:51,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:52,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:52,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:52,692 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:52,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [793169535] [2020-08-21 22:18:52,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:52,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 22:18:52,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769462825] [2020-08-21 22:18:52,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 22:18:52,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:52,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 22:18:52,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 22:18:52,694 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 22:18:53,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:53,750 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 22:18:53,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 22:18:53,751 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 22:18:53,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:53,752 INFO L225 Difference]: With dead ends: 56 [2020-08-21 22:18:53,753 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 22:18:53,753 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 [2020-08-21 22:18:53,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 22:18:53,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 22:18:53,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 22:18:53,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 22:18:53,757 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 22:18:53,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:53,758 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 22:18:53,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 22:18:53,758 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 22:18:53,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 22:18:53,758 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:53,759 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:53,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 22:18:53,759 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:53,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:53,759 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 22:18:53,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:53,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960940185] [2020-08-21 22:18:53,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:53,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:55,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:55,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:55,021 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:55,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960940185] [2020-08-21 22:18:55,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:55,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 22:18:55,022 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537795370] [2020-08-21 22:18:55,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 22:18:55,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:55,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 22:18:55,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 22:18:55,023 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 22:18:56,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:56,167 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 22:18:56,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 22:18:56,171 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 22:18:56,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:56,172 INFO L225 Difference]: With dead ends: 57 [2020-08-21 22:18:56,172 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 22:18:56,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 22:18:56,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 22:18:56,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 22:18:56,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 22:18:56,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 22:18:56,176 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 22:18:56,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:56,177 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 22:18:56,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 22:18:56,177 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 22:18:56,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 22:18:56,177 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:56,177 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:56,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 22:18:56,178 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:56,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:56,178 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 22:18:56,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:56,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [30333714] [2020-08-21 22:18:56,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:56,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:57,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:57,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:57,483 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:57,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [30333714] [2020-08-21 22:18:57,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:57,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 22:18:57,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134613675] [2020-08-21 22:18:57,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 22:18:57,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:57,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 22:18:57,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 22:18:57,484 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 22:18:58,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:58,675 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 22:18:58,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 22:18:58,676 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 22:18:58,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:58,677 INFO L225 Difference]: With dead ends: 58 [2020-08-21 22:18:58,677 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 22:18:58,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 22:18:58,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 22:18:58,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 22:18:58,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 22:18:58,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 22:18:58,683 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 22:18:58,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:58,683 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 22:18:58,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 22:18:58,683 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 22:18:58,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 22:18:58,684 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:58,684 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:58,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 22:18:58,684 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:58,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:58,684 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 22:18:58,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:58,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321357163] [2020-08-21 22:18:58,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:58,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:00,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:00,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:00,187 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:00,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321357163] [2020-08-21 22:19:00,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:00,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 22:19:00,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269277553] [2020-08-21 22:19:00,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 22:19:00,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:00,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 22:19:00,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 22:19:00,190 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 22:19:01,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:01,434 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 22:19:01,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 22:19:01,437 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 22:19:01,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:01,438 INFO L225 Difference]: With dead ends: 59 [2020-08-21 22:19:01,438 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 22:19:01,439 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 22:19:01,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 22:19:01,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 22:19:01,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 22:19:01,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 22:19:01,443 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 22:19:01,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:01,444 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 22:19:01,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 22:19:01,444 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 22:19:01,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 22:19:01,445 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:01,445 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:01,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 22:19:01,445 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:01,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:01,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 22:19:01,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:01,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [662065019] [2020-08-21 22:19:01,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:01,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:03,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:03,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:03,038 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:03,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [662065019] [2020-08-21 22:19:03,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:03,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 22:19:03,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1532044152] [2020-08-21 22:19:03,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 22:19:03,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:03,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 22:19:03,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 22:19:03,041 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 22:19:04,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:04,358 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 22:19:04,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 22:19:04,358 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 22:19:04,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:04,359 INFO L225 Difference]: With dead ends: 60 [2020-08-21 22:19:04,359 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 22:19:04,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 22:19:04,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 22:19:04,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 22:19:04,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 22:19:04,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 22:19:04,364 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 22:19:04,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:04,364 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 22:19:04,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 22:19:04,364 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 22:19:04,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 22:19:04,365 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:04,365 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:04,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 22:19:04,365 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:04,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:04,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 22:19:04,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:04,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1627595784] [2020-08-21 22:19:04,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:04,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:05,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:05,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:05,893 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:05,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1627595784] [2020-08-21 22:19:05,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:05,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 22:19:05,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831387167] [2020-08-21 22:19:05,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 22:19:05,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:05,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 22:19:05,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 22:19:05,895 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 22:19:07,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:07,285 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 22:19:07,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 22:19:07,286 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 22:19:07,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:07,287 INFO L225 Difference]: With dead ends: 61 [2020-08-21 22:19:07,288 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 22:19:07,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 22:19:07,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 22:19:07,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 22:19:07,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 22:19:07,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 22:19:07,293 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 22:19:07,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:07,294 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 22:19:07,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 22:19:07,294 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 22:19:07,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 22:19:07,294 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:07,294 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:07,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 22:19:07,295 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:07,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:07,295 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 22:19:07,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:07,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157407818] [2020-08-21 22:19:07,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:07,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:08,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:08,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:08,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:08,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [157407818] [2020-08-21 22:19:08,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:08,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 22:19:08,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706679705] [2020-08-21 22:19:08,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 22:19:08,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:08,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 22:19:08,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 22:19:08,906 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 22:19:10,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:10,295 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 22:19:10,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 22:19:10,296 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 22:19:10,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:10,297 INFO L225 Difference]: With dead ends: 62 [2020-08-21 22:19:10,297 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 22:19:10,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 22:19:10,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 22:19:10,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 22:19:10,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 22:19:10,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 22:19:10,302 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 22:19:10,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:10,303 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 22:19:10,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 22:19:10,303 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 22:19:10,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 22:19:10,303 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:10,303 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:10,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 22:19:10,304 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:10,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:10,304 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 22:19:10,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:10,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1152809572] [2020-08-21 22:19:10,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:10,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:12,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:12,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:12,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:12,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1152809572] [2020-08-21 22:19:12,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:12,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 22:19:12,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51482471] [2020-08-21 22:19:12,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 22:19:12,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:12,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 22:19:12,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 22:19:12,019 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 22:19:13,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:13,523 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 22:19:13,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 22:19:13,524 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 22:19:13,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:13,525 INFO L225 Difference]: With dead ends: 63 [2020-08-21 22:19:13,525 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 22:19:13,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 22:19:13,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 22:19:13,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 22:19:13,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 22:19:13,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 22:19:13,530 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 22:19:13,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:13,531 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 22:19:13,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 22:19:13,531 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 22:19:13,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 22:19:13,531 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:13,531 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:13,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 22:19:13,532 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:13,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:13,532 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 22:19:13,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:13,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [783317553] [2020-08-21 22:19:13,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:13,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:15,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:19:15,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:19:15,211 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:19:15,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [783317553] [2020-08-21 22:19:15,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:19:15,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 22:19:15,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775897524] [2020-08-21 22:19:15,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 22:19:15,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:19:15,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 22:19:15,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 22:19:15,213 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-21 22:19:16,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:19:16,741 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 22:19:16,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 22:19:16,747 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-21 22:19:16,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:19:16,748 INFO L225 Difference]: With dead ends: 64 [2020-08-21 22:19:16,748 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 22:19:16,749 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 22:19:16,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 22:19:16,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 22:19:16,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 22:19:16,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 22:19:16,753 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-21 22:19:16,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:19:16,753 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 22:19:16,753 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 22:19:16,753 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 22:19:16,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 22:19:16,754 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:19:16,754 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:19:16,754 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 22:19:16,754 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:19:16,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:19:16,754 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-21 22:19:16,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:19:16,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [995580846] [2020-08-21 22:19:16,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:19:16,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat