/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=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 20:40:25,308 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 20:40:25,375 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 20:40:25,377 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 20:40:25,380 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 20:40:25,381 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 20:40:25,384 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 20:40:25,385 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 20:40:25,387 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 20:40:25,395 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 20:40:25,396 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 20:40:25,397 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 20:40:25,402 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 20:40:25,403 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 20:40:25,415 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 20:40:25,431 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 20:40:25,432 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 20:40:25,433 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 20:40:25,434 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 20:40:25,471 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 20:40:25,471 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 20:40:25,473 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 20:40:25,473 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 20:40:25,473 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 20:40:25,474 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 20:40:25,474 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 20:40:25,474 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 20:40:25,474 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 20:40:25,474 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 20:40:25,475 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 20:40:25,476 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 20:40:25,476 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 20:40:25,476 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 20:40:25,476 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 20:40:25,477 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 20:40:25,477 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 20:40:25,477 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 20:40:25,477 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 20:40:25,477 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 20:40:25,478 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 20:40:25,478 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:40:25,478 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 20:40:25,478 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 20:40:25,478 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 20:40:25,479 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 20:40:25,479 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 20:40:25,479 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 20:40:25,479 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 20:40:25,479 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=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; [2020-08-21 20:40:25,797 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 20:40:25,810 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 20:40:25,814 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 20:40:25,816 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 20:40:25,816 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 20:40:25,817 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 20:40:25,889 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/59fe46fd7/0c4072fcf8b446b7879f53b2ec39270f/FLAGf9ae12415 [2020-08-21 20:40:26,359 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 20:40:26,360 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 20:40:26,367 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/59fe46fd7/0c4072fcf8b446b7879f53b2ec39270f/FLAGf9ae12415 [2020-08-21 20:40:26,773 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/59fe46fd7/0c4072fcf8b446b7879f53b2ec39270f [2020-08-21 20:40:26,784 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 20:40:26,786 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 20:40:26,787 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 20:40:26,787 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 20:40:26,791 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 20:40:26,792 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:40:26" (1/1) ... [2020-08-21 20:40:26,795 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4839a71c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:40:26, skipping insertion in model container [2020-08-21 20:40:26,795 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:40:26" (1/1) ... [2020-08-21 20:40:26,803 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 20:40:26,821 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 20:40:27,005 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:40:27,012 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 20:40:27,028 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:40:27,041 INFO L208 MainTranslator]: Completed translation [2020-08-21 20:40:27,041 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:40:27 WrapperNode [2020-08-21 20:40:27,042 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 20:40:27,042 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 20:40:27,043 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 20:40:27,043 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 20:40:27,148 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:40:27" (1/1) ... [2020-08-21 20:40:27,150 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:40:27" (1/1) ... [2020-08-21 20:40:27,159 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:40:27" (1/1) ... [2020-08-21 20:40:27,159 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:40:27" (1/1) ... [2020-08-21 20:40:27,180 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:40:27" (1/1) ... [2020-08-21 20:40:27,188 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:40:27" (1/1) ... [2020-08-21 20:40:27,189 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:40:27" (1/1) ... [2020-08-21 20:40:27,191 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 20:40:27,192 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 20:40:27,192 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 20:40:27,192 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 20:40:27,193 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:40:27" (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 20:40:27,254 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 20:40:27,254 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 20:40:27,255 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 20:40:27,255 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 20:40:27,255 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 20:40:27,255 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 20:40:27,255 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 20:40:27,256 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 20:40:27,256 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 20:40:27,256 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 20:40:27,256 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 20:40:27,256 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 20:40:27,256 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 20:40:27,256 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 20:40:27,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 20:40:27,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 20:40:27,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 20:40:27,520 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 20:40:27,521 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 20:40:27,526 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:40:27 BoogieIcfgContainer [2020-08-21 20:40:27,526 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 20:40:27,527 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 20:40:27,528 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 20:40:27,532 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 20:40:27,532 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 08:40:26" (1/3) ... [2020-08-21 20:40:27,534 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f1fea01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:40:27, skipping insertion in model container [2020-08-21 20:40:27,534 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:40:27" (2/3) ... [2020-08-21 20:40:27,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f1fea01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:40:27, skipping insertion in model container [2020-08-21 20:40:27,535 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:40:27" (3/3) ... [2020-08-21 20:40:27,540 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-21 20:40:27,572 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 20:40:27,593 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 20:40:27,625 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 20:40:27,666 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 20:40:27,667 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 20:40:27,667 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 20:40:27,667 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 20:40:27,667 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 20:40:27,667 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 20:40:27,667 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 20:40:27,667 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 20:40:27,690 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 20:40:27,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 20:40:27,697 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:27,698 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:27,698 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:27,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:27,703 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-21 20:40:27,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:27,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [897588875] [2020-08-21 20:40:27,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:27,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:27,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:27,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:27,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:27,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:27,931 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 20:40:27,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [897588875] [2020-08-21 20:40:27,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:40:27,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 20:40:27,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423454122] [2020-08-21 20:40:27,941 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:40:27,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:27,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:40:27,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:40:27,958 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 20:40:28,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:28,117 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 20:40:28,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 20:40:28,119 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 20:40:28,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:28,130 INFO L225 Difference]: With dead ends: 59 [2020-08-21 20:40:28,131 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 20:40:28,135 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 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 20:40:28,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 20:40:28,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 20:40:28,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 20:40:28,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 20:40:28,178 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 20:40:28,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:28,179 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 20:40:28,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:40:28,179 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 20:40:28,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 20:40:28,180 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:28,181 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:28,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 20:40:28,181 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:28,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:28,182 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-21 20:40:28,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:28,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008198507] [2020-08-21 20:40:28,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:28,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:28,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:28,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:28,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:28,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:28,365 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 20:40:28,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008198507] [2020-08-21 20:40:28,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:40:28,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 20:40:28,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24659484] [2020-08-21 20:40:28,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:40:28,368 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:28,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:40:28,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:40:28,369 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 20:40:28,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:28,574 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 20:40:28,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:40:28,575 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 20:40:28,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:28,576 INFO L225 Difference]: With dead ends: 48 [2020-08-21 20:40:28,576 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 20:40:28,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:40:28,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 20:40:28,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 20:40:28,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 20:40:28,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 20:40:28,586 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 20:40:28,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:28,587 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 20:40:28,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:40:28,587 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 20:40:28,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 20:40:28,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:28,588 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:28,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 20:40:28,589 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:28,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:28,589 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-21 20:40:28,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:28,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1185147475] [2020-08-21 20:40:28,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:28,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:28,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:28,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:28,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:28,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:28,770 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 20:40:28,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1185147475] [2020-08-21 20:40:28,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:28,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:40:28,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198593867] [2020-08-21 20:40:28,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:40:28,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:28,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:40:28,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:40:28,774 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 20:40:28,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:28,980 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 20:40:28,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:40:28,981 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 20:40:28,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:28,982 INFO L225 Difference]: With dead ends: 50 [2020-08-21 20:40:28,982 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 20:40:28,983 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:40:28,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 20:40:28,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 20:40:28,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 20:40:28,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 20:40:28,991 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 20:40:28,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:28,991 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 20:40:28,992 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:40:28,992 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 20:40:28,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 20:40:28,993 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:28,993 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:28,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 20:40:28,993 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:28,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:28,994 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-21 20:40:28,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:28,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1601798298] [2020-08-21 20:40:28,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:29,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:29,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:29,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:29,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:29,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:29,201 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:40:29,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1601798298] [2020-08-21 20:40:29,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:29,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:40:29,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270484434] [2020-08-21 20:40:29,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:40:29,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:29,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:40:29,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:40:29,204 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 20:40:29,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:29,376 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 20:40:29,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:40:29,376 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 20:40:29,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:29,377 INFO L225 Difference]: With dead ends: 52 [2020-08-21 20:40:29,378 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 20:40:29,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:40:29,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 20:40:29,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 20:40:29,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 20:40:29,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 20:40:29,386 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 20:40:29,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:29,386 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 20:40:29,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:40:29,386 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 20:40:29,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 20:40:29,387 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:29,388 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:29,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 20:40:29,388 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:29,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:29,389 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-21 20:40:29,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:29,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [138631059] [2020-08-21 20:40:29,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:29,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:29,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:29,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:29,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:29,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:29,643 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:40:29,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [138631059] [2020-08-21 20:40:29,644 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:29,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:40:29,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020997045] [2020-08-21 20:40:29,645 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:40:29,645 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:29,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:40:29,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:40:29,646 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 20:40:29,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:29,822 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 20:40:29,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:40:29,822 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 20:40:29,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:29,823 INFO L225 Difference]: With dead ends: 54 [2020-08-21 20:40:29,823 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 20:40:29,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:40:29,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 20:40:29,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 20:40:29,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 20:40:29,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 20:40:29,830 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 20:40:29,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:29,831 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 20:40:29,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:40:29,831 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 20:40:29,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 20:40:29,832 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:29,832 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:29,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 20:40:29,833 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:29,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:29,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-21 20:40:29,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:29,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [328728764] [2020-08-21 20:40:29,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:29,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:29,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:29,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:29,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:29,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:30,114 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:40:30,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [328728764] [2020-08-21 20:40:30,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:30,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:40:30,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827994882] [2020-08-21 20:40:30,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:40:30,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:30,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:40:30,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:40:30,117 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 20:40:30,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:30,289 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 20:40:30,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:40:30,289 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 20:40:30,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:30,290 INFO L225 Difference]: With dead ends: 56 [2020-08-21 20:40:30,291 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 20:40:30,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:40:30,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 20:40:30,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 20:40:30,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 20:40:30,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 20:40:30,297 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 20:40:30,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:30,298 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 20:40:30,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:40:30,298 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 20:40:30,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 20:40:30,299 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:30,299 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:30,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 20:40:30,300 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:30,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:30,300 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-21 20:40:30,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:30,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1548973624] [2020-08-21 20:40:30,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:30,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:30,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:30,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:30,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:30,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:30,580 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:40:30,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1548973624] [2020-08-21 20:40:30,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:30,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:40:30,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429638457] [2020-08-21 20:40:30,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:40:30,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:30,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:40:30,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:40:30,582 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 20:40:30,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:30,771 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 20:40:30,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:40:30,771 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 20:40:30,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:30,772 INFO L225 Difference]: With dead ends: 58 [2020-08-21 20:40:30,772 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 20:40:30,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:40:30,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 20:40:30,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 20:40:30,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 20:40:30,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 20:40:30,781 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 20:40:30,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:30,782 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 20:40:30,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:40:30,783 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 20:40:30,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 20:40:30,786 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:30,787 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:30,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 20:40:30,787 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:30,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:30,788 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-21 20:40:30,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:30,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116697568] [2020-08-21 20:40:30,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:30,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:30,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:30,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:30,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:30,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:31,123 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 20:40:31,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116697568] [2020-08-21 20:40:31,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:31,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:40:31,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624176329] [2020-08-21 20:40:31,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:40:31,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:31,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:40:31,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:40:31,126 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 20:40:31,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:31,330 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 20:40:31,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 20:40:31,330 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 20:40:31,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:31,331 INFO L225 Difference]: With dead ends: 60 [2020-08-21 20:40:31,331 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 20:40:31,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:40:31,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 20:40:31,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 20:40:31,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 20:40:31,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 20:40:31,338 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 20:40:31,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:31,338 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 20:40:31,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:40:31,338 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 20:40:31,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 20:40:31,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:31,339 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:31,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 20:40:31,340 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:31,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:31,340 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-21 20:40:31,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:31,341 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1313839897] [2020-08-21 20:40:31,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:31,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:31,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:31,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:31,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:31,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:31,683 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:40:31,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1313839897] [2020-08-21 20:40:31,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:31,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:40:31,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401528654] [2020-08-21 20:40:31,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:40:31,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:31,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:40:31,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:40:31,686 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 20:40:31,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:31,889 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 20:40:31,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:40:31,890 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 20:40:31,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:31,891 INFO L225 Difference]: With dead ends: 62 [2020-08-21 20:40:31,891 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 20:40:31,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:40:31,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 20:40:31,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 20:40:31,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 20:40:31,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 20:40:31,897 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 20:40:31,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:31,898 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 20:40:31,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:40:31,898 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 20:40:31,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 20:40:31,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:31,899 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:31,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 20:40:31,899 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:31,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:31,900 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-21 20:40:31,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:31,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162495533] [2020-08-21 20:40:31,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:31,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:31,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:31,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:31,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:31,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:32,332 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:40:32,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162495533] [2020-08-21 20:40:32,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:32,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 20:40:32,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34762552] [2020-08-21 20:40:32,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 20:40:32,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:32,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 20:40:32,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:40:32,335 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 20:40:32,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:32,550 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 20:40:32,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 20:40:32,550 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 20:40:32,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:32,551 INFO L225 Difference]: With dead ends: 64 [2020-08-21 20:40:32,551 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 20:40:32,552 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:40:32,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 20:40:32,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 20:40:32,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 20:40:32,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 20:40:32,558 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 20:40:32,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:32,558 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 20:40:32,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 20:40:32,559 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 20:40:32,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 20:40:32,560 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:32,560 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:32,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 20:40:32,560 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:32,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:32,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-21 20:40:32,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:32,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912538991] [2020-08-21 20:40:32,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:32,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:32,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:32,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:32,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:32,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:32,624 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 20:40:32,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912538991] [2020-08-21 20:40:32,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:40:32,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 20:40:32,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284402762] [2020-08-21 20:40:32,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:40:32,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:32,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:40:32,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:40:32,627 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 20:40:32,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:32,715 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 20:40:32,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 20:40:32,715 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 20:40:32,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:32,717 INFO L225 Difference]: With dead ends: 65 [2020-08-21 20:40:32,717 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 20:40:32,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:40:32,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 20:40:32,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 20:40:32,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 20:40:32,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 20:40:32,742 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 20:40:32,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:32,742 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 20:40:32,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:40:32,742 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 20:40:32,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 20:40:32,743 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:32,743 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:32,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 20:40:32,744 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:32,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:32,744 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-21 20:40:32,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:32,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1588111674] [2020-08-21 20:40:32,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:32,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:32,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:32,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:32,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:32,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:32,853 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 20:40:32,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1588111674] [2020-08-21 20:40:32,853 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:32,853 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 20:40:32,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516605226] [2020-08-21 20:40:32,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:40:32,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:32,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:40:32,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:40:32,855 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 20:40:32,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:32,965 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 20:40:32,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:40:32,966 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 20:40:32,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:32,967 INFO L225 Difference]: With dead ends: 73 [2020-08-21 20:40:32,967 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 20:40:32,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:40:32,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 20:40:32,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 20:40:32,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 20:40:32,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 20:40:32,976 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 20:40:32,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:32,977 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 20:40:32,977 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:40:32,977 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 20:40:32,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 20:40:32,978 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:32,978 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:32,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 20:40:32,978 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:32,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:32,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-21 20:40:32,979 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:32,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261756561] [2020-08-21 20:40:32,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:32,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:33,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:33,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:33,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:33,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:33,055 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-21 20:40:33,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261756561] [2020-08-21 20:40:33,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:40:33,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 20:40:33,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357253623] [2020-08-21 20:40:33,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:40:33,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:33,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:40:33,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:40:33,058 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 20:40:33,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:33,171 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 20:40:33,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 20:40:33,171 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 20:40:33,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:33,172 INFO L225 Difference]: With dead ends: 69 [2020-08-21 20:40:33,172 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 20:40:33,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:40:33,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 20:40:33,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 20:40:33,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 20:40:33,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 20:40:33,178 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 20:40:33,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:33,179 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 20:40:33,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:40:33,179 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 20:40:33,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 20:40:33,180 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:33,180 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:33,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 20:40:33,180 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:33,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:33,181 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-21 20:40:33,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:33,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [183173950] [2020-08-21 20:40:33,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:33,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:33,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:33,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:33,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:33,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:33,599 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:33,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [183173950] [2020-08-21 20:40:33,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:33,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 20:40:33,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126147608] [2020-08-21 20:40:33,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 20:40:33,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:33,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 20:40:33,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:40:33,603 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 20:40:33,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:33,833 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 20:40:33,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 20:40:33,834 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 20:40:33,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:33,834 INFO L225 Difference]: With dead ends: 74 [2020-08-21 20:40:33,835 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 20:40:33,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:40:33,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 20:40:33,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 20:40:33,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 20:40:33,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 20:40:33,841 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 20:40:33,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:33,841 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 20:40:33,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 20:40:33,842 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 20:40:33,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 20:40:33,842 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:33,842 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:33,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 20:40:33,843 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:33,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:33,843 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-21 20:40:33,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:33,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1208033788] [2020-08-21 20:40:33,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:33,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:33,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:33,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:33,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:33,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:34,334 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:34,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1208033788] [2020-08-21 20:40:34,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:34,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 20:40:34,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244665110] [2020-08-21 20:40:34,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 20:40:34,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:34,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 20:40:34,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:40:34,337 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 20:40:34,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:34,558 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 20:40:34,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 20:40:34,559 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 20:40:34,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:34,559 INFO L225 Difference]: With dead ends: 76 [2020-08-21 20:40:34,560 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 20:40:34,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:40:34,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 20:40:34,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 20:40:34,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 20:40:34,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 20:40:34,569 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 20:40:34,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:34,570 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 20:40:34,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 20:40:34,571 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 20:40:34,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 20:40:34,572 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:34,572 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:34,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 20:40:34,573 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:34,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:34,573 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-21 20:40:34,574 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:34,574 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121257526] [2020-08-21 20:40:34,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:34,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:34,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:34,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:34,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:34,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:35,137 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:35,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121257526] [2020-08-21 20:40:35,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:35,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 20:40:35,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630911886] [2020-08-21 20:40:35,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 20:40:35,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:35,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 20:40:35,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:40:35,142 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 20:40:35,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:35,405 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 20:40:35,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 20:40:35,406 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 20:40:35,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:35,408 INFO L225 Difference]: With dead ends: 78 [2020-08-21 20:40:35,408 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 20:40:35,409 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:40:35,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 20:40:35,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 20:40:35,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 20:40:35,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 20:40:35,422 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 20:40:35,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:35,422 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 20:40:35,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 20:40:35,425 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 20:40:35,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 20:40:35,426 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:35,426 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:35,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 20:40:35,426 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:35,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:35,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-21 20:40:35,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:35,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530733522] [2020-08-21 20:40:35,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:35,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:35,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:35,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:35,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:35,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:36,029 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:36,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530733522] [2020-08-21 20:40:36,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:36,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 20:40:36,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063630874] [2020-08-21 20:40:36,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 20:40:36,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:36,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 20:40:36,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:40:36,031 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 20:40:36,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:36,287 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 20:40:36,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 20:40:36,288 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 20:40:36,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:36,289 INFO L225 Difference]: With dead ends: 80 [2020-08-21 20:40:36,289 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 20:40:36,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:40:36,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 20:40:36,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 20:40:36,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 20:40:36,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 20:40:36,295 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 20:40:36,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:36,296 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 20:40:36,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 20:40:36,296 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 20:40:36,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 20:40:36,296 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:36,297 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:36,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 20:40:36,297 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:36,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:36,297 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-21 20:40:36,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:36,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82617067] [2020-08-21 20:40:36,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:36,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:36,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:36,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:36,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:36,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:36,914 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:36,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82617067] [2020-08-21 20:40:36,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:36,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 20:40:36,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733729502] [2020-08-21 20:40:36,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 20:40:36,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:36,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 20:40:36,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:40:36,917 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 20:40:37,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:37,197 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 20:40:37,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 20:40:37,198 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 20:40:37,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:37,199 INFO L225 Difference]: With dead ends: 82 [2020-08-21 20:40:37,199 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 20:40:37,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:40:37,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 20:40:37,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 20:40:37,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 20:40:37,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 20:40:37,204 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 20:40:37,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:37,205 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 20:40:37,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 20:40:37,205 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 20:40:37,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 20:40:37,206 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:37,206 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:37,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 20:40:37,206 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:37,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:37,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-21 20:40:37,207 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:37,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804549785] [2020-08-21 20:40:37,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:37,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:37,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:37,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:37,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:37,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:37,875 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:37,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804549785] [2020-08-21 20:40:37,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:37,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 20:40:37,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86396719] [2020-08-21 20:40:37,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 20:40:37,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:37,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 20:40:37,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:40:37,877 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 20:40:38,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:38,158 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 20:40:38,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 20:40:38,159 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 20:40:38,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:38,160 INFO L225 Difference]: With dead ends: 84 [2020-08-21 20:40:38,160 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 20:40:38,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:40:38,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 20:40:38,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 20:40:38,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 20:40:38,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 20:40:38,171 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 20:40:38,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:38,171 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 20:40:38,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 20:40:38,172 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 20:40:38,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 20:40:38,172 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:38,172 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:38,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 20:40:38,173 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:38,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:38,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-21 20:40:38,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:38,174 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409103612] [2020-08-21 20:40:38,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:38,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:38,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:38,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:38,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:38,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:39,135 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:39,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409103612] [2020-08-21 20:40:39,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:39,136 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 20:40:39,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017830633] [2020-08-21 20:40:39,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 20:40:39,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:39,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 20:40:39,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:40:39,139 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 20:40:39,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:39,321 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 20:40:39,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 20:40:39,322 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 20:40:39,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:39,323 INFO L225 Difference]: With dead ends: 86 [2020-08-21 20:40:39,323 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 20:40:39,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:40:39,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 20:40:39,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 20:40:39,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 20:40:39,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 20:40:39,329 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 20:40:39,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:39,330 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 20:40:39,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 20:40:39,330 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 20:40:39,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 20:40:39,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:39,331 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:39,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 20:40:39,331 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:39,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:39,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-21 20:40:39,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:39,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1264885314] [2020-08-21 20:40:39,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:39,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:39,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:39,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:39,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:39,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:40,146 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:40,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1264885314] [2020-08-21 20:40:40,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:40,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 20:40:40,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741680852] [2020-08-21 20:40:40,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 20:40:40,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:40,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 20:40:40,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:40:40,148 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 20:40:40,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:40,456 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 20:40:40,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 20:40:40,457 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 20:40:40,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:40,458 INFO L225 Difference]: With dead ends: 88 [2020-08-21 20:40:40,458 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 20:40:40,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:40:40,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 20:40:40,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 20:40:40,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 20:40:40,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 20:40:40,464 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 20:40:40,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:40,464 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 20:40:40,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 20:40:40,464 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 20:40:40,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 20:40:40,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:40,465 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:40,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 20:40:40,465 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:40,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:40,466 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-21 20:40:40,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:40,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784901356] [2020-08-21 20:40:40,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:40,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:40,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:40,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:40,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:40,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:41,290 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:41,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784901356] [2020-08-21 20:40:41,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:41,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 20:40:41,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611534135] [2020-08-21 20:40:41,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 20:40:41,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:41,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 20:40:41,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:40:41,292 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 20:40:41,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:41,612 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 20:40:41,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 20:40:41,614 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 20:40:41,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:41,615 INFO L225 Difference]: With dead ends: 90 [2020-08-21 20:40:41,616 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 20:40:41,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:40:41,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 20:40:41,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 20:40:41,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 20:40:41,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 20:40:41,621 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 20:40:41,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:41,621 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 20:40:41,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 20:40:41,622 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 20:40:41,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 20:40:41,622 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:41,622 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:41,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 20:40:41,623 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:41,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:41,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-21 20:40:41,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:41,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1079759373] [2020-08-21 20:40:41,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:41,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:41,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:41,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:41,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:41,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:42,527 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:42,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1079759373] [2020-08-21 20:40:42,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:42,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 20:40:42,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848550580] [2020-08-21 20:40:42,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 20:40:42,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:42,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 20:40:42,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:40:42,529 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 20:40:42,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:42,833 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 20:40:42,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 20:40:42,833 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 20:40:42,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:42,834 INFO L225 Difference]: With dead ends: 92 [2020-08-21 20:40:42,835 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 20:40:42,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:40:42,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 20:40:42,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 20:40:42,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 20:40:42,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 20:40:42,841 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 20:40:42,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:42,841 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 20:40:42,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 20:40:42,841 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 20:40:42,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 20:40:42,842 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:42,842 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:42,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 20:40:42,843 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:42,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:42,843 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-21 20:40:42,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:42,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307342825] [2020-08-21 20:40:42,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:42,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:42,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:42,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:42,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:42,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:44,071 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:44,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307342825] [2020-08-21 20:40:44,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:44,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 20:40:44,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208647381] [2020-08-21 20:40:44,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 20:40:44,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:44,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 20:40:44,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:40:44,075 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 20:40:44,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:44,480 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 20:40:44,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 20:40:44,481 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 20:40:44,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:44,482 INFO L225 Difference]: With dead ends: 94 [2020-08-21 20:40:44,482 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 20:40:44,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-21 20:40:44,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 20:40:44,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 20:40:44,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 20:40:44,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 20:40:44,489 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 20:40:44,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:44,489 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 20:40:44,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 20:40:44,490 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 20:40:44,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 20:40:44,490 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:44,491 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:44,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 20:40:44,493 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:44,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:44,494 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-21 20:40:44,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:44,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468885945] [2020-08-21 20:40:44,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:44,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:44,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:44,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:44,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:44,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:45,543 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:45,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468885945] [2020-08-21 20:40:45,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:45,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 20:40:45,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612471631] [2020-08-21 20:40:45,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 20:40:45,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:45,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 20:40:45,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:40:45,545 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 20:40:45,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:45,901 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 20:40:45,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 20:40:45,901 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 20:40:45,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:45,902 INFO L225 Difference]: With dead ends: 96 [2020-08-21 20:40:45,902 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 20:40:45,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-21 20:40:45,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 20:40:45,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 20:40:45,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 20:40:45,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 20:40:45,908 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 20:40:45,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:45,908 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 20:40:45,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 20:40:45,908 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 20:40:45,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 20:40:45,909 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:45,909 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:45,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 20:40:45,909 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:45,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:45,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-21 20:40:45,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:45,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1228304265] [2020-08-21 20:40:45,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:45,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:45,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:45,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:45,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:46,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:47,049 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:47,049 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1228304265] [2020-08-21 20:40:47,049 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:47,049 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 20:40:47,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109422474] [2020-08-21 20:40:47,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 20:40:47,050 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:47,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 20:40:47,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:40:47,051 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 20:40:47,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:47,277 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 20:40:47,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 20:40:47,278 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 20:40:47,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:47,279 INFO L225 Difference]: With dead ends: 98 [2020-08-21 20:40:47,279 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 20:40:47,280 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-21 20:40:47,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 20:40:47,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 20:40:47,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 20:40:47,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 20:40:47,286 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 20:40:47,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:47,286 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 20:40:47,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 20:40:47,286 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 20:40:47,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 20:40:47,287 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:47,287 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:47,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 20:40:47,287 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:47,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:47,288 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-21 20:40:47,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:47,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079718767] [2020-08-21 20:40:47,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:47,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:47,332 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:47,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:47,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:47,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:48,489 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:48,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079718767] [2020-08-21 20:40:48,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:48,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 20:40:48,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438432376] [2020-08-21 20:40:48,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 20:40:48,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:48,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 20:40:48,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 20:40:48,491 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 20:40:48,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:48,830 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 20:40:48,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 20:40:48,830 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 20:40:48,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:48,831 INFO L225 Difference]: With dead ends: 100 [2020-08-21 20:40:48,831 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 20:40:48,832 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-21 20:40:48,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 20:40:48,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 20:40:48,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 20:40:48,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 20:40:48,838 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 20:40:48,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:48,838 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 20:40:48,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 20:40:48,838 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 20:40:48,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 20:40:48,839 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:48,839 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:48,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 20:40:48,839 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:48,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:48,840 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-21 20:40:48,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:48,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [826428644] [2020-08-21 20:40:48,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:48,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:48,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:48,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:48,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:48,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:50,243 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:50,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [826428644] [2020-08-21 20:40:50,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:50,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 20:40:50,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689726679] [2020-08-21 20:40:50,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 20:40:50,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:50,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 20:40:50,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 20:40:50,245 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 20:40:50,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:50,579 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 20:40:50,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 20:40:50,579 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 20:40:50,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:50,580 INFO L225 Difference]: With dead ends: 102 [2020-08-21 20:40:50,580 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 20:40:50,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-21 20:40:50,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 20:40:50,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 20:40:50,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 20:40:50,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 20:40:50,586 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 20:40:50,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:50,587 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 20:40:50,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 20:40:50,587 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 20:40:50,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 20:40:50,587 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:50,588 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:50,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 20:40:50,588 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:50,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:50,588 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-21 20:40:50,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:50,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001313188] [2020-08-21 20:40:50,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:50,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:50,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:50,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:50,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:50,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:51,897 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:51,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001313188] [2020-08-21 20:40:51,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:51,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 20:40:51,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376227206] [2020-08-21 20:40:51,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 20:40:51,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:51,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 20:40:51,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 20:40:51,899 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 20:40:52,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:52,202 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 20:40:52,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 20:40:52,203 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 20:40:52,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:52,204 INFO L225 Difference]: With dead ends: 104 [2020-08-21 20:40:52,204 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 20:40:52,205 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 20:40:52,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 20:40:52,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 20:40:52,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 20:40:52,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 20:40:52,210 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 20:40:52,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:52,210 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 20:40:52,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 20:40:52,210 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 20:40:52,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 20:40:52,210 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:52,211 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:52,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 20:40:52,211 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:52,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:52,211 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-21 20:40:52,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:52,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [247983058] [2020-08-21 20:40:52,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:52,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:52,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:52,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:52,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:52,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:53,812 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:53,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [247983058] [2020-08-21 20:40:53,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:53,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 20:40:53,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543175707] [2020-08-21 20:40:53,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 20:40:53,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:53,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 20:40:53,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 20:40:53,815 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 20:40:54,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:54,255 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 20:40:54,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 20:40:54,256 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 20:40:54,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:54,257 INFO L225 Difference]: With dead ends: 106 [2020-08-21 20:40:54,257 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 20:40:54,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 20:40:54,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 20:40:54,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 20:40:54,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 20:40:54,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 20:40:54,264 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 20:40:54,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:54,264 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 20:40:54,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 20:40:54,264 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 20:40:54,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 20:40:54,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:54,266 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:54,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 20:40:54,266 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:54,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:54,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-21 20:40:54,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:54,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2128491678] [2020-08-21 20:40:54,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:54,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:54,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:54,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:54,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:54,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:55,736 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:55,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2128491678] [2020-08-21 20:40:55,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:55,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 20:40:55,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995665301] [2020-08-21 20:40:55,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 20:40:55,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:55,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 20:40:55,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 20:40:55,738 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 20:40:56,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:56,185 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 20:40:56,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 20:40:56,187 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 20:40:56,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:56,188 INFO L225 Difference]: With dead ends: 108 [2020-08-21 20:40:56,188 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 20:40:56,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 20:40:56,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 20:40:56,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 20:40:56,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 20:40:56,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 20:40:56,192 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 20:40:56,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:56,192 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 20:40:56,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 20:40:56,192 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 20:40:56,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 20:40:56,193 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:56,193 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:56,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 20:40:56,193 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:56,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:56,194 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-21 20:40:56,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:56,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887106016] [2020-08-21 20:40:56,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:56,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:56,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:56,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:56,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:56,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:57,686 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:57,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887106016] [2020-08-21 20:40:57,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:57,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 20:40:57,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096823521] [2020-08-21 20:40:57,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 20:40:57,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:57,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 20:40:57,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 20:40:57,688 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 20:40:58,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:40:58,158 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 20:40:58,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 20:40:58,158 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 20:40:58,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:40:58,160 INFO L225 Difference]: With dead ends: 110 [2020-08-21 20:40:58,160 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 20:40:58,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 20:40:58,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 20:40:58,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 20:40:58,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 20:40:58,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 20:40:58,164 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 20:40:58,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:40:58,164 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 20:40:58,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 20:40:58,165 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 20:40:58,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 20:40:58,165 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:40:58,166 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:40:58,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 20:40:58,166 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:40:58,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:40:58,166 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-21 20:40:58,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:40:58,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1969014851] [2020-08-21 20:40:58,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:40:58,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:58,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:40:58,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:58,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:40:58,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:40:59,746 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:40:59,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1969014851] [2020-08-21 20:40:59,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:40:59,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 20:40:59,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511445219] [2020-08-21 20:40:59,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 20:40:59,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:40:59,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 20:40:59,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 20:40:59,748 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 20:41:00,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:00,202 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 20:41:00,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 20:41:00,202 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 20:41:00,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:00,204 INFO L225 Difference]: With dead ends: 112 [2020-08-21 20:41:00,204 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 20:41:00,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 20:41:00,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 20:41:00,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 20:41:00,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 20:41:00,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 20:41:00,208 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 20:41:00,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:00,208 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 20:41:00,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 20:41:00,208 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 20:41:00,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 20:41:00,209 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:00,209 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:00,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 20:41:00,209 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:00,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:00,210 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-21 20:41:00,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:00,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569451100] [2020-08-21 20:41:00,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:00,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:00,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:00,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:00,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:41:00,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:01,963 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:41:01,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569451100] [2020-08-21 20:41:01,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:01,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 20:41:01,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706345016] [2020-08-21 20:41:01,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 20:41:01,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:01,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 20:41:01,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 20:41:01,965 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 20:41:02,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:02,406 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 20:41:02,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 20:41:02,407 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 20:41:02,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:02,408 INFO L225 Difference]: With dead ends: 114 [2020-08-21 20:41:02,408 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 20:41:02,409 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 20:41:02,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 20:41:02,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 20:41:02,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 20:41:02,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 20:41:02,413 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 20:41:02,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:02,414 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 20:41:02,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 20:41:02,414 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 20:41:02,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 20:41:02,414 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:02,415 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:02,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 20:41:02,415 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:02,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:02,415 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-21 20:41:02,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:02,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [476972015] [2020-08-21 20:41:02,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:02,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:02,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:02,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:02,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:41:02,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:04,336 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:41:04,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [476972015] [2020-08-21 20:41:04,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:04,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 20:41:04,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255738458] [2020-08-21 20:41:04,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 20:41:04,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:04,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 20:41:04,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 20:41:04,338 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 20:41:04,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:04,702 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 20:41:04,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 20:41:04,702 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 20:41:04,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:04,703 INFO L225 Difference]: With dead ends: 116 [2020-08-21 20:41:04,704 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 20:41:04,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 20:41:04,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 20:41:04,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 20:41:04,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 20:41:04,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 20:41:04,710 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 20:41:04,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:04,711 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 20:41:04,711 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 20:41:04,711 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 20:41:04,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 20:41:04,711 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:04,712 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:04,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 20:41:04,712 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:04,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:04,712 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-21 20:41:04,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:04,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1983202035] [2020-08-21 20:41:04,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:04,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:04,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:04,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:04,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:41:04,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:06,610 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:41:06,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1983202035] [2020-08-21 20:41:06,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:06,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 20:41:06,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983723079] [2020-08-21 20:41:06,611 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 20:41:06,611 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:06,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 20:41:06,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 20:41:06,612 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 20:41:07,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:07,113 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 20:41:07,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 20:41:07,114 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 20:41:07,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:07,115 INFO L225 Difference]: With dead ends: 118 [2020-08-21 20:41:07,115 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 20:41:07,117 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 20:41:07,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 20:41:07,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 20:41:07,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 20:41:07,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 20:41:07,121 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 20:41:07,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:07,122 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 20:41:07,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 20:41:07,122 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 20:41:07,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 20:41:07,123 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:07,123 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:07,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 20:41:07,123 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:07,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:07,123 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-21 20:41:07,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:07,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1803615674] [2020-08-21 20:41:07,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:07,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:07,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:07,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:07,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:41:07,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:09,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:41:09,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1803615674] [2020-08-21 20:41:09,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:09,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 20:41:09,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121559867] [2020-08-21 20:41:09,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 20:41:09,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:09,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 20:41:09,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 20:41:09,147 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 20:41:09,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:09,586 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 20:41:09,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 20:41:09,587 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 20:41:09,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:09,588 INFO L225 Difference]: With dead ends: 120 [2020-08-21 20:41:09,588 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 20:41:09,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 20:41:09,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 20:41:09,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 20:41:09,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 20:41:09,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 20:41:09,598 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 20:41:09,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:09,599 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 20:41:09,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 20:41:09,599 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 20:41:09,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 20:41:09,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:09,602 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:09,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 20:41:09,603 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:09,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:09,603 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-21 20:41:09,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:09,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1683385447] [2020-08-21 20:41:09,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:09,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:09,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:09,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:09,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:41:09,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:11,673 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:41:11,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1683385447] [2020-08-21 20:41:11,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:11,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 20:41:11,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173670597] [2020-08-21 20:41:11,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 20:41:11,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:11,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 20:41:11,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 20:41:11,675 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 20:41:12,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:12,028 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 20:41:12,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 20:41:12,028 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 20:41:12,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:12,029 INFO L225 Difference]: With dead ends: 122 [2020-08-21 20:41:12,029 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 20:41:12,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 20:41:12,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 20:41:12,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 20:41:12,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 20:41:12,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 20:41:12,035 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 20:41:12,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:12,035 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 20:41:12,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 20:41:12,035 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 20:41:12,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 20:41:12,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:12,036 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:12,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 20:41:12,036 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:12,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:12,036 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-21 20:41:12,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:12,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1978250965] [2020-08-21 20:41:12,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:12,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:12,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:12,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:12,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:41:12,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:14,280 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:41:14,280 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1978250965] [2020-08-21 20:41:14,280 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:14,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 20:41:14,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481488752] [2020-08-21 20:41:14,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 20:41:14,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:14,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 20:41:14,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 20:41:14,282 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 20:41:14,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:14,577 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 20:41:14,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 20:41:14,578 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 20:41:14,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:14,579 INFO L225 Difference]: With dead ends: 124 [2020-08-21 20:41:14,579 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 20:41:14,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 20:41:14,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 20:41:14,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 20:41:14,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 20:41:14,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 20:41:14,586 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 20:41:14,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:14,586 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 20:41:14,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 20:41:14,586 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 20:41:14,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 20:41:14,587 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:14,587 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:14,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 20:41:14,587 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:14,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:14,588 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-21 20:41:14,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:14,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1095730310] [2020-08-21 20:41:14,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:14,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:14,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:14,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:14,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:41:14,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:16,837 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:41:16,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1095730310] [2020-08-21 20:41:16,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:16,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 20:41:16,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268952575] [2020-08-21 20:41:16,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 20:41:16,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:16,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 20:41:16,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 20:41:16,839 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 20:41:17,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:17,198 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 20:41:17,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 20:41:17,199 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 20:41:17,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:17,200 INFO L225 Difference]: With dead ends: 126 [2020-08-21 20:41:17,200 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 20:41:17,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 20:41:17,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 20:41:17,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 20:41:17,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 20:41:17,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 20:41:17,207 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 20:41:17,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:17,207 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 20:41:17,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 20:41:17,207 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 20:41:17,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 20:41:17,208 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:17,208 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:17,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 20:41:17,209 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:17,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:17,209 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-21 20:41:17,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:17,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066247735] [2020-08-21 20:41:17,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:17,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:17,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:17,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:17,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:41:17,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:19,635 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:41:19,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066247735] [2020-08-21 20:41:19,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:19,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 20:41:19,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969245904] [2020-08-21 20:41:19,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 20:41:19,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:19,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 20:41:19,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 20:41:19,637 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 20:41:20,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:20,077 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 20:41:20,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 20:41:20,077 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 20:41:20,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:20,079 INFO L225 Difference]: With dead ends: 128 [2020-08-21 20:41:20,079 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 20:41:20,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 20:41:20,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 20:41:20,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 20:41:20,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 20:41:20,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 20:41:20,086 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 20:41:20,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:20,086 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 20:41:20,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 20:41:20,086 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 20:41:20,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 20:41:20,087 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:20,087 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:20,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 20:41:20,087 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:20,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:20,088 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-21 20:41:20,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:20,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [507589578] [2020-08-21 20:41:20,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:20,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:20,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:20,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:20,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:41:20,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:22,630 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 20:41:22,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [507589578] [2020-08-21 20:41:22,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:22,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 20:41:22,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371560021] [2020-08-21 20:41:22,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 20:41:22,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:22,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 20:41:22,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 20:41:22,632 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 20:41:23,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:23,255 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 20:41:23,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 20:41:23,256 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 20:41:23,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:23,257 INFO L225 Difference]: With dead ends: 130 [2020-08-21 20:41:23,257 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 20:41:23,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 20:41:23,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 20:41:23,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 20:41:23,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 20:41:23,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 20:41:23,264 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 20:41:23,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:23,264 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 20:41:23,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 20:41:23,265 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 20:41:23,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 20:41:23,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:23,266 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:23,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 20:41:23,266 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:23,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:23,266 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-21 20:41:23,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:23,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450821550] [2020-08-21 20:41:23,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:23,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:23,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 20:41:23,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat