/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=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 17:28:01,750 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:28:01,752 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:28:01,776 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:28:01,776 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:28:01,777 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:28:01,778 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:28:01,780 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:28:01,782 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:28:01,783 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:28:01,784 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:28:01,785 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:28:01,786 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:28:01,787 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:28:01,788 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:28:01,789 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:28:01,790 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:28:01,791 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:28:01,793 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:28:01,795 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:28:01,797 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:28:01,798 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:28:01,800 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:28:01,800 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:28:01,803 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 17:28:01,803 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 17:28:01,804 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 17:28:01,805 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 17:28:01,805 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 17:28:01,806 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 17:28:01,811 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:28:01,812 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:28:01,813 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:28:01,816 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 17:28:01,862 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:28:01,862 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:28:01,864 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:28:01,864 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:28:01,864 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:28:01,864 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:28:01,865 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:28:01,867 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:28:01,867 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:28:01,867 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:28:01,867 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:28:01,868 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:28:01,868 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:28:01,868 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:28:01,868 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:28:01,868 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:28:01,868 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:28:01,869 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:28:01,869 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:28:01,869 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:28:01,869 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:28:01,869 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:28:01,873 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:28:01,873 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:28:01,873 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:28:01,873 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:28:01,874 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:28:01,874 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:28:01,874 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:28:01,874 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=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:28:02,219 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:28:02,241 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:28:02,247 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:28:02,249 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:28:02,250 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:28:02,251 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 17:28:02,329 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/65bf7ea5b/9f1f5dc4eeab4fb383f3b78b84910e78/FLAG1d95c89a5 [2020-08-21 17:28:02,798 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:28:02,798 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 17:28:02,805 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/65bf7ea5b/9f1f5dc4eeab4fb383f3b78b84910e78/FLAG1d95c89a5 [2020-08-21 17:28:03,168 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/65bf7ea5b/9f1f5dc4eeab4fb383f3b78b84910e78 [2020-08-21 17:28:03,178 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:28:03,180 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:28:03,181 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:28:03,181 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:28:03,186 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:28:03,187 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:28:03" (1/1) ... [2020-08-21 17:28:03,191 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c294ab3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:03, skipping insertion in model container [2020-08-21 17:28:03,191 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:28:03" (1/1) ... [2020-08-21 17:28:03,200 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:28:03,219 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:28:03,456 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:28:03,462 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:28:03,479 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:28:03,496 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:28:03,498 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:03 WrapperNode [2020-08-21 17:28:03,498 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:28:03,499 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:28:03,499 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:28:03,499 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:28:03,513 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:03" (1/1) ... [2020-08-21 17:28:03,515 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:03" (1/1) ... [2020-08-21 17:28:03,520 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:03" (1/1) ... [2020-08-21 17:28:03,520 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:03" (1/1) ... [2020-08-21 17:28:03,608 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:03" (1/1) ... [2020-08-21 17:28:03,614 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:03" (1/1) ... [2020-08-21 17:28:03,615 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:03" (1/1) ... [2020-08-21 17:28:03,616 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:28:03,617 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:28:03,617 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:28:03,617 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:28:03,618 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:03" (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 17:28:03,684 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:28:03,684 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:28:03,684 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 17:28:03,685 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:28:03,685 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:28:03,685 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 17:28:03,685 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:28:03,685 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:28:03,685 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:28:03,837 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:28:03,837 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 17:28:03,840 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:28:03 BoogieIcfgContainer [2020-08-21 17:28:03,840 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:28:03,842 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:28:03,842 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:28:03,845 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:28:03,845 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:28:03" (1/3) ... [2020-08-21 17:28:03,846 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11c734a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:28:03, skipping insertion in model container [2020-08-21 17:28:03,846 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:28:03" (2/3) ... [2020-08-21 17:28:03,846 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@11c734a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:28:03, skipping insertion in model container [2020-08-21 17:28:03,847 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:28:03" (3/3) ... [2020-08-21 17:28:03,848 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-21 17:28:03,859 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:28:03,866 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:28:03,881 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:28:03,905 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:28:03,905 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:28:03,905 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:28:03,905 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:28:03,906 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:28:03,906 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:28:03,906 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:28:03,906 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:28:03,925 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 17:28:03,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 17:28:03,936 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:03,937 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:03,937 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:03,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:03,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 17:28:03,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:03,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [808812200] [2020-08-21 17:28:03,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:04,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:04,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,161 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 17:28:04,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [808812200] [2020-08-21 17:28:04,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:28:04,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 17:28:04,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854947541] [2020-08-21 17:28:04,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 17:28:04,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:04,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 17:28:04,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 17:28:04,199 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 17:28:04,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:04,259 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 17:28:04,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 17:28:04,261 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 17:28:04,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:04,270 INFO L225 Difference]: With dead ends: 29 [2020-08-21 17:28:04,271 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 17:28:04,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 17:28:04,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 17:28:04,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 17:28:04,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 17:28:04,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 17:28:04,314 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 17:28:04,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:04,315 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 17:28:04,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 17:28:04,315 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 17:28:04,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 17:28:04,316 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:04,316 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:04,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:28:04,317 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:04,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:04,317 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 17:28:04,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:04,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [863384494] [2020-08-21 17:28:04,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:04,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:04,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,426 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 17:28:04,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [863384494] [2020-08-21 17:28:04,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:04,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 17:28:04,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748328133] [2020-08-21 17:28:04,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 17:28:04,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:04,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 17:28:04,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:28:04,431 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 17:28:04,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:04,451 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 17:28:04,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 17:28:04,452 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 17:28:04,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:04,453 INFO L225 Difference]: With dead ends: 18 [2020-08-21 17:28:04,454 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 17:28:04,455 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:28:04,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 17:28:04,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 17:28:04,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 17:28:04,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 17:28:04,459 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 17:28:04,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:04,460 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 17:28:04,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 17:28:04,460 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 17:28:04,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 17:28:04,461 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:04,461 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:04,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:28:04,461 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:04,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:04,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 17:28:04,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:04,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1471024719] [2020-08-21 17:28:04,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:04,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:04,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,572 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:04,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1471024719] [2020-08-21 17:28:04,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:04,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 17:28:04,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753078292] [2020-08-21 17:28:04,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:28:04,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:04,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:28:04,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:28:04,577 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 17:28:04,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:04,602 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 17:28:04,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:28:04,603 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 17:28:04,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:04,604 INFO L225 Difference]: With dead ends: 19 [2020-08-21 17:28:04,604 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 17:28:04,605 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:28:04,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 17:28:04,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 17:28:04,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 17:28:04,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 17:28:04,610 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 17:28:04,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:04,611 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 17:28:04,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:28:04,611 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 17:28:04,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 17:28:04,612 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:04,612 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:04,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:28:04,613 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:04,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:04,613 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 17:28:04,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:04,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179151591] [2020-08-21 17:28:04,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:04,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:04,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,717 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:04,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179151591] [2020-08-21 17:28:04,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:04,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 17:28:04,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818444242] [2020-08-21 17:28:04,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:28:04,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:04,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:28:04,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:28:04,720 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 17:28:04,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:04,746 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 17:28:04,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 17:28:04,747 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 17:28:04,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:04,748 INFO L225 Difference]: With dead ends: 20 [2020-08-21 17:28:04,748 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 17:28:04,749 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:28:04,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 17:28:04,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 17:28:04,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 17:28:04,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 17:28:04,754 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 17:28:04,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:04,754 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 17:28:04,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:28:04,755 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 17:28:04,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 17:28:04,755 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:04,756 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:04,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:28:04,756 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:04,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:04,757 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 17:28:04,757 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:04,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841146101] [2020-08-21 17:28:04,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:04,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:04,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,874 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:04,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841146101] [2020-08-21 17:28:04,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:04,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:28:04,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718196449] [2020-08-21 17:28:04,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:28:04,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:04,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:28:04,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:28:04,877 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 17:28:04,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:04,916 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 17:28:04,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:28:04,918 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 17:28:04,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:04,919 INFO L225 Difference]: With dead ends: 21 [2020-08-21 17:28:04,919 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 17:28:04,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:28:04,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 17:28:04,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 17:28:04,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 17:28:04,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 17:28:04,926 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 17:28:04,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:04,927 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 17:28:04,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:28:04,927 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 17:28:04,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 17:28:04,928 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:04,928 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:04,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 17:28:04,929 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:04,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:04,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 17:28:04,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:04,930 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [3099554] [2020-08-21 17:28:04,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:04,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:05,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,096 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:05,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [3099554] [2020-08-21 17:28:05,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:05,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 17:28:05,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445978290] [2020-08-21 17:28:05,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 17:28:05,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:05,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 17:28:05,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:28:05,099 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 17:28:05,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:05,165 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 17:28:05,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 17:28:05,166 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 17:28:05,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:05,167 INFO L225 Difference]: With dead ends: 22 [2020-08-21 17:28:05,167 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 17:28:05,168 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:28:05,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 17:28:05,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 17:28:05,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 17:28:05,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 17:28:05,174 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 17:28:05,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:05,174 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 17:28:05,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 17:28:05,174 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 17:28:05,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 17:28:05,175 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:05,175 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:05,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 17:28:05,176 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:05,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:05,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 17:28:05,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:05,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [914606513] [2020-08-21 17:28:05,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:05,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:05,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,316 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:05,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [914606513] [2020-08-21 17:28:05,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:05,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 17:28:05,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047298417] [2020-08-21 17:28:05,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 17:28:05,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:05,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 17:28:05,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:28:05,319 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 17:28:05,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:05,382 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 17:28:05,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 17:28:05,382 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 17:28:05,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:05,383 INFO L225 Difference]: With dead ends: 23 [2020-08-21 17:28:05,383 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 17:28:05,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:28:05,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 17:28:05,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 17:28:05,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 17:28:05,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 17:28:05,389 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 17:28:05,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:05,390 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 17:28:05,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 17:28:05,390 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 17:28:05,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 17:28:05,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:05,391 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:05,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 17:28:05,392 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:05,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:05,392 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 17:28:05,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:05,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [520049701] [2020-08-21 17:28:05,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:05,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:05,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,537 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:05,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [520049701] [2020-08-21 17:28:05,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:05,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 17:28:05,538 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467091708] [2020-08-21 17:28:05,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 17:28:05,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:05,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 17:28:05,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:28:05,540 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 17:28:05,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:05,592 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 17:28:05,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 17:28:05,593 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 17:28:05,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:05,594 INFO L225 Difference]: With dead ends: 24 [2020-08-21 17:28:05,594 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 17:28:05,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:28:05,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 17:28:05,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 17:28:05,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 17:28:05,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 17:28:05,599 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 17:28:05,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:05,600 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 17:28:05,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 17:28:05,600 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 17:28:05,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 17:28:05,601 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:05,601 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:05,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 17:28:05,601 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:05,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:05,602 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 17:28:05,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:05,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654092159] [2020-08-21 17:28:05,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:05,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:05,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,781 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 17:28:05,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654092159] [2020-08-21 17:28:05,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:05,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 17:28:05,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203251295] [2020-08-21 17:28:05,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 17:28:05,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:05,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 17:28:05,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:28:05,784 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 17:28:05,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:05,876 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 17:28:05,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 17:28:05,877 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 17:28:05,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:05,878 INFO L225 Difference]: With dead ends: 25 [2020-08-21 17:28:05,878 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 17:28:05,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:28:05,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 17:28:05,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 17:28:05,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 17:28:05,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 17:28:05,884 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 17:28:05,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:05,884 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 17:28:05,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 17:28:05,885 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 17:28:05,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 17:28:05,885 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:05,885 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:05,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 17:28:05,886 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:05,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:05,886 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 17:28:05,887 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:05,887 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [859276113] [2020-08-21 17:28:05,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:05,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:06,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,142 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:06,142 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [859276113] [2020-08-21 17:28:06,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:06,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 17:28:06,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475795835] [2020-08-21 17:28:06,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 17:28:06,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:06,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 17:28:06,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:28:06,145 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 17:28:06,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:06,247 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 17:28:06,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 17:28:06,248 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 17:28:06,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:06,249 INFO L225 Difference]: With dead ends: 26 [2020-08-21 17:28:06,249 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 17:28:06,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:28:06,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 17:28:06,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 17:28:06,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 17:28:06,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 17:28:06,262 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 17:28:06,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:06,264 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 17:28:06,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 17:28:06,265 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 17:28:06,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 17:28:06,266 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:06,266 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:06,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 17:28:06,267 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:06,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:06,267 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 17:28:06,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:06,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1173047868] [2020-08-21 17:28:06,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:06,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:06,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,502 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:06,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1173047868] [2020-08-21 17:28:06,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:06,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 17:28:06,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957116722] [2020-08-21 17:28:06,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 17:28:06,503 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:06,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 17:28:06,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:28:06,504 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 17:28:06,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:06,610 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 17:28:06,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 17:28:06,610 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 17:28:06,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:06,611 INFO L225 Difference]: With dead ends: 27 [2020-08-21 17:28:06,611 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 17:28:06,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:28:06,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 17:28:06,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 17:28:06,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 17:28:06,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 17:28:06,617 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 17:28:06,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:06,617 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 17:28:06,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 17:28:06,618 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 17:28:06,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 17:28:06,618 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:06,619 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:06,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 17:28:06,619 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:06,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:06,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 17:28:06,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:06,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [832935010] [2020-08-21 17:28:06,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:06,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:06,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,832 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:06,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [832935010] [2020-08-21 17:28:06,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:06,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 17:28:06,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209310244] [2020-08-21 17:28:06,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 17:28:06,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:06,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 17:28:06,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:28:06,836 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 17:28:06,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:06,949 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 17:28:06,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 17:28:06,951 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 17:28:06,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:06,952 INFO L225 Difference]: With dead ends: 28 [2020-08-21 17:28:06,952 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 17:28:06,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:28:06,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 17:28:06,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 17:28:06,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 17:28:06,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 17:28:06,962 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 17:28:06,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:06,962 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 17:28:06,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 17:28:06,963 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 17:28:06,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 17:28:06,963 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:06,964 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:06,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 17:28:06,964 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:06,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:06,965 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 17:28:06,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:06,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1917581851] [2020-08-21 17:28:06,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:06,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:07,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:07,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:07,216 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:07,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1917581851] [2020-08-21 17:28:07,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:07,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 17:28:07,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362922725] [2020-08-21 17:28:07,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 17:28:07,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:07,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 17:28:07,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:28:07,221 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 17:28:07,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:07,348 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 17:28:07,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 17:28:07,350 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 17:28:07,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:07,351 INFO L225 Difference]: With dead ends: 29 [2020-08-21 17:28:07,351 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 17:28:07,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:28:07,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 17:28:07,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 17:28:07,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 17:28:07,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 17:28:07,361 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 17:28:07,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:07,361 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 17:28:07,361 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 17:28:07,361 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 17:28:07,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 17:28:07,362 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:07,362 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:07,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 17:28:07,363 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:07,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:07,363 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 17:28:07,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:07,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1676048911] [2020-08-21 17:28:07,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:07,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:07,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:07,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:07,651 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:07,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1676048911] [2020-08-21 17:28:07,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:07,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 17:28:07,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534948240] [2020-08-21 17:28:07,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 17:28:07,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:07,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 17:28:07,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:28:07,654 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 17:28:07,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:07,799 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 17:28:07,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 17:28:07,800 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 17:28:07,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:07,801 INFO L225 Difference]: With dead ends: 30 [2020-08-21 17:28:07,801 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 17:28:07,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:28:07,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 17:28:07,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 17:28:07,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 17:28:07,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 17:28:07,807 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 17:28:07,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:07,807 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 17:28:07,807 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 17:28:07,807 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 17:28:07,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 17:28:07,808 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:07,808 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:07,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 17:28:07,809 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:07,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:07,809 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 17:28:07,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:07,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [634103216] [2020-08-21 17:28:07,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:07,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:08,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:08,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:08,058 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:08,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [634103216] [2020-08-21 17:28:08,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:08,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 17:28:08,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221459930] [2020-08-21 17:28:08,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 17:28:08,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:08,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 17:28:08,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:28:08,061 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 17:28:08,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:08,205 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 17:28:08,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 17:28:08,206 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 17:28:08,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:08,207 INFO L225 Difference]: With dead ends: 31 [2020-08-21 17:28:08,207 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 17:28:08,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:28:08,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 17:28:08,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 17:28:08,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 17:28:08,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 17:28:08,213 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 17:28:08,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:08,213 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 17:28:08,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 17:28:08,213 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 17:28:08,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 17:28:08,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:08,217 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:08,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 17:28:08,217 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:08,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:08,217 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 17:28:08,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:08,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603537325] [2020-08-21 17:28:08,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:08,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:08,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:08,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:08,544 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:08,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603537325] [2020-08-21 17:28:08,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:08,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 17:28:08,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347442635] [2020-08-21 17:28:08,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 17:28:08,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:08,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 17:28:08,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:28:08,547 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 17:28:08,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:08,729 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 17:28:08,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 17:28:08,730 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 17:28:08,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:08,731 INFO L225 Difference]: With dead ends: 32 [2020-08-21 17:28:08,731 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 17:28:08,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:28:08,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 17:28:08,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 17:28:08,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 17:28:08,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 17:28:08,736 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 17:28:08,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:08,736 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 17:28:08,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 17:28:08,737 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 17:28:08,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 17:28:08,737 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:08,738 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:08,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 17:28:08,738 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:08,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:08,738 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 17:28:08,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:08,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1308282936] [2020-08-21 17:28:08,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:08,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:09,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:09,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:09,028 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:09,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1308282936] [2020-08-21 17:28:09,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:09,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 17:28:09,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684093231] [2020-08-21 17:28:09,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 17:28:09,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:09,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 17:28:09,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:28:09,031 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 17:28:09,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:09,218 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 17:28:09,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 17:28:09,220 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 17:28:09,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:09,221 INFO L225 Difference]: With dead ends: 33 [2020-08-21 17:28:09,221 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 17:28:09,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:28:09,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 17:28:09,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 17:28:09,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 17:28:09,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 17:28:09,227 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 17:28:09,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:09,227 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 17:28:09,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 17:28:09,228 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 17:28:09,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 17:28:09,228 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:09,229 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:09,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 17:28:09,229 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:09,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:09,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 17:28:09,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:09,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [906839523] [2020-08-21 17:28:09,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:09,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:09,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:09,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:09,623 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:09,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [906839523] [2020-08-21 17:28:09,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:09,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 17:28:09,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650013063] [2020-08-21 17:28:09,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 17:28:09,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:09,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 17:28:09,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:28:09,628 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 17:28:09,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:09,887 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 17:28:09,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 17:28:09,887 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 17:28:09,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:09,888 INFO L225 Difference]: With dead ends: 34 [2020-08-21 17:28:09,888 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 17:28:09,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:28:09,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 17:28:09,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 17:28:09,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 17:28:09,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 17:28:09,894 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 17:28:09,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:09,895 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 17:28:09,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 17:28:09,895 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 17:28:09,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 17:28:09,895 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:09,896 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:09,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 17:28:09,896 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:09,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:09,896 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 17:28:09,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:09,897 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [584328823] [2020-08-21 17:28:09,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:09,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:10,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:10,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:10,261 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:10,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [584328823] [2020-08-21 17:28:10,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:10,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 17:28:10,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706145795] [2020-08-21 17:28:10,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 17:28:10,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:10,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 17:28:10,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:28:10,263 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 17:28:10,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:10,546 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 17:28:10,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 17:28:10,548 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 17:28:10,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:10,549 INFO L225 Difference]: With dead ends: 35 [2020-08-21 17:28:10,549 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 17:28:10,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:28:10,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 17:28:10,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 17:28:10,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 17:28:10,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 17:28:10,558 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 17:28:10,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:10,559 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 17:28:10,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 17:28:10,559 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 17:28:10,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 17:28:10,560 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:10,560 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:10,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 17:28:10,560 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:10,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:10,561 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 17:28:10,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:10,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [279358705] [2020-08-21 17:28:10,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:10,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:10,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:10,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:10,936 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:10,936 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [279358705] [2020-08-21 17:28:10,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:10,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 17:28:10,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273227634] [2020-08-21 17:28:10,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 17:28:10,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:10,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 17:28:10,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:28:10,938 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 17:28:11,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:11,221 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 17:28:11,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 17:28:11,227 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 17:28:11,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:11,228 INFO L225 Difference]: With dead ends: 36 [2020-08-21 17:28:11,228 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 17:28:11,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:28:11,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 17:28:11,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 17:28:11,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 17:28:11,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 17:28:11,234 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 17:28:11,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:11,234 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 17:28:11,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 17:28:11,234 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 17:28:11,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 17:28:11,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:11,235 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:11,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 17:28:11,235 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:11,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:11,236 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 17:28:11,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:11,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402237648] [2020-08-21 17:28:11,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:11,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:11,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:11,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:11,632 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:11,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402237648] [2020-08-21 17:28:11,633 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:11,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 17:28:11,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452690256] [2020-08-21 17:28:11,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 17:28:11,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:11,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 17:28:11,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:28:11,635 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 17:28:11,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:11,935 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 17:28:11,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 17:28:11,935 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 17:28:11,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:11,936 INFO L225 Difference]: With dead ends: 37 [2020-08-21 17:28:11,936 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 17:28:11,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:28:11,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 17:28:11,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 17:28:11,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 17:28:11,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 17:28:11,941 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 17:28:11,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:11,941 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 17:28:11,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 17:28:11,942 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 17:28:11,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 17:28:11,942 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:11,942 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:11,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 17:28:11,943 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:11,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:11,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 17:28:11,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:11,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1376698332] [2020-08-21 17:28:11,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:11,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:12,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:12,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:12,452 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:12,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1376698332] [2020-08-21 17:28:12,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:12,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 17:28:12,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136603313] [2020-08-21 17:28:12,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 17:28:12,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:12,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 17:28:12,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:28:12,455 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 17:28:12,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:12,795 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 17:28:12,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 17:28:12,798 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 17:28:12,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:12,799 INFO L225 Difference]: With dead ends: 38 [2020-08-21 17:28:12,799 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 17:28:12,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:28:12,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 17:28:12,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 17:28:12,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 17:28:12,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 17:28:12,804 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 17:28:12,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:12,804 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 17:28:12,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 17:28:12,805 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 17:28:12,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 17:28:12,805 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:12,805 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:12,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 17:28:12,806 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:12,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:12,806 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 17:28:12,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:12,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993086732] [2020-08-21 17:28:12,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:12,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:13,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:13,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:13,349 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:13,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993086732] [2020-08-21 17:28:13,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:13,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 17:28:13,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503499423] [2020-08-21 17:28:13,350 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 17:28:13,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:13,351 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 17:28:13,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 17:28:13,351 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 17:28:13,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:13,681 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 17:28:13,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 17:28:13,681 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 17:28:13,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:13,682 INFO L225 Difference]: With dead ends: 39 [2020-08-21 17:28:13,682 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 17:28:13,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 17:28:13,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 17:28:13,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 17:28:13,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 17:28:13,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 17:28:13,688 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 17:28:13,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:13,689 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 17:28:13,689 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 17:28:13,689 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 17:28:13,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 17:28:13,690 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:13,690 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:13,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 17:28:13,690 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:13,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:13,691 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 17:28:13,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:13,691 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780002086] [2020-08-21 17:28:13,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:13,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:14,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:14,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:14,200 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:14,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780002086] [2020-08-21 17:28:14,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:14,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 17:28:14,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515319766] [2020-08-21 17:28:14,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 17:28:14,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:14,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 17:28:14,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 17:28:14,202 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 17:28:14,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:14,587 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 17:28:14,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 17:28:14,587 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 17:28:14,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:14,588 INFO L225 Difference]: With dead ends: 40 [2020-08-21 17:28:14,588 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 17:28:14,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 17:28:14,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 17:28:14,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 17:28:14,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 17:28:14,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 17:28:14,594 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 17:28:14,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:14,595 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 17:28:14,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 17:28:14,595 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 17:28:14,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 17:28:14,596 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:14,596 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:14,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 17:28:14,596 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:14,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:14,597 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 17:28:14,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:14,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1496514095] [2020-08-21 17:28:14,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:14,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:15,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:15,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:15,198 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:15,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1496514095] [2020-08-21 17:28:15,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:15,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 17:28:15,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183622360] [2020-08-21 17:28:15,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 17:28:15,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:15,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 17:28:15,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:28:15,201 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 17:28:15,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:15,772 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 17:28:15,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 17:28:15,773 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 17:28:15,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:15,775 INFO L225 Difference]: With dead ends: 41 [2020-08-21 17:28:15,775 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 17:28:15,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:28:15,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 17:28:15,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 17:28:15,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 17:28:15,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 17:28:15,782 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 17:28:15,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:15,783 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 17:28:15,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 17:28:15,783 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 17:28:15,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 17:28:15,784 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:15,784 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:15,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 17:28:15,785 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:15,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:15,786 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 17:28:15,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:15,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [248435306] [2020-08-21 17:28:15,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:15,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:16,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:16,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:16,433 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:16,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [248435306] [2020-08-21 17:28:16,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:16,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 17:28:16,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688832534] [2020-08-21 17:28:16,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 17:28:16,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:16,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 17:28:16,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:28:16,436 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 17:28:16,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:16,885 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 17:28:16,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 17:28:16,887 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 17:28:16,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:16,887 INFO L225 Difference]: With dead ends: 42 [2020-08-21 17:28:16,887 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 17:28:16,888 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:28:16,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 17:28:16,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 17:28:16,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 17:28:16,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 17:28:16,893 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 17:28:16,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:16,893 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 17:28:16,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 17:28:16,894 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 17:28:16,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 17:28:16,894 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:16,894 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:16,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 17:28:16,895 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:16,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:16,895 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 17:28:16,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:16,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2014642344] [2020-08-21 17:28:16,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:16,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:17,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:17,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:17,507 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:17,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2014642344] [2020-08-21 17:28:17,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:17,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 17:28:17,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429383382] [2020-08-21 17:28:17,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 17:28:17,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:17,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 17:28:17,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 17:28:17,509 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 17:28:17,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:17,974 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 17:28:17,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 17:28:17,974 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 17:28:17,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:17,975 INFO L225 Difference]: With dead ends: 43 [2020-08-21 17:28:17,975 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 17:28:17,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 17:28:17,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 17:28:17,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 17:28:17,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 17:28:17,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 17:28:17,980 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 17:28:17,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:17,981 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 17:28:17,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 17:28:17,981 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 17:28:17,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 17:28:17,982 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:17,982 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:17,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 17:28:17,982 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:17,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:17,983 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 17:28:17,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:17,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [838673345] [2020-08-21 17:28:17,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:18,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:18,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:18,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:18,605 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:18,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [838673345] [2020-08-21 17:28:18,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:18,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 17:28:18,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578429958] [2020-08-21 17:28:18,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 17:28:18,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:18,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 17:28:18,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:28:18,607 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 17:28:19,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:19,116 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 17:28:19,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 17:28:19,117 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 17:28:19,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:19,118 INFO L225 Difference]: With dead ends: 44 [2020-08-21 17:28:19,118 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 17:28:19,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:28:19,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 17:28:19,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 17:28:19,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 17:28:19,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 17:28:19,123 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 17:28:19,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:19,123 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 17:28:19,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 17:28:19,123 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 17:28:19,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 17:28:19,124 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:19,124 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:19,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 17:28:19,124 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:19,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:19,125 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 17:28:19,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:19,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [791578147] [2020-08-21 17:28:19,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:19,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:19,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:19,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:19,828 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:19,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [791578147] [2020-08-21 17:28:19,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:19,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 17:28:19,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676727249] [2020-08-21 17:28:19,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 17:28:19,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:19,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 17:28:19,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 17:28:19,830 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 17:28:20,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:20,366 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 17:28:20,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 17:28:20,367 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 17:28:20,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:20,368 INFO L225 Difference]: With dead ends: 45 [2020-08-21 17:28:20,368 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 17:28:20,369 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 17:28:20,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 17:28:20,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 17:28:20,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 17:28:20,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 17:28:20,373 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 17:28:20,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:20,373 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 17:28:20,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 17:28:20,374 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 17:28:20,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 17:28:20,374 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:20,374 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:20,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 17:28:20,375 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:20,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:20,375 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 17:28:20,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:20,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1040356713] [2020-08-21 17:28:20,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:20,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:21,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:21,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:21,140 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:21,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1040356713] [2020-08-21 17:28:21,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:21,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 17:28:21,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713052882] [2020-08-21 17:28:21,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 17:28:21,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:21,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 17:28:21,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 17:28:21,142 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 17:28:21,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:21,719 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 17:28:21,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 17:28:21,720 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 17:28:21,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:21,721 INFO L225 Difference]: With dead ends: 46 [2020-08-21 17:28:21,721 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 17:28:21,722 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 17:28:21,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 17:28:21,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 17:28:21,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 17:28:21,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 17:28:21,727 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 17:28:21,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:21,727 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 17:28:21,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 17:28:21,728 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 17:28:21,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 17:28:21,728 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:21,728 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:21,729 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 17:28:21,729 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:21,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:21,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 17:28:21,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:21,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012580379] [2020-08-21 17:28:21,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:21,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:22,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:22,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:22,516 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:22,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012580379] [2020-08-21 17:28:22,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:22,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 17:28:22,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225866989] [2020-08-21 17:28:22,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 17:28:22,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:22,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 17:28:22,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 17:28:22,518 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 17:28:23,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:23,156 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 17:28:23,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 17:28:23,156 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 17:28:23,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:23,157 INFO L225 Difference]: With dead ends: 47 [2020-08-21 17:28:23,158 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 17:28:23,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 17:28:23,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 17:28:23,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 17:28:23,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 17:28:23,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 17:28:23,163 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 17:28:23,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:23,164 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 17:28:23,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 17:28:23,164 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 17:28:23,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 17:28:23,164 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:23,165 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:23,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 17:28:23,165 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:23,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:23,165 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 17:28:23,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:23,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891420348] [2020-08-21 17:28:23,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:23,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:23,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:23,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:23,991 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:23,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891420348] [2020-08-21 17:28:23,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:23,992 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 17:28:23,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124465671] [2020-08-21 17:28:23,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 17:28:23,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:23,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 17:28:23,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:28:23,993 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 17:28:24,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:24,673 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 17:28:24,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 17:28:24,675 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 17:28:24,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:24,676 INFO L225 Difference]: With dead ends: 48 [2020-08-21 17:28:24,676 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 17:28:24,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:28:24,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 17:28:24,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 17:28:24,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 17:28:24,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 17:28:24,681 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 17:28:24,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:24,681 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 17:28:24,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 17:28:24,681 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 17:28:24,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 17:28:24,681 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:24,682 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:24,682 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 17:28:24,682 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:24,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:24,682 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 17:28:24,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:24,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270983202] [2020-08-21 17:28:24,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:24,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:25,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:25,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:25,565 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:25,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270983202] [2020-08-21 17:28:25,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:25,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 17:28:25,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435150573] [2020-08-21 17:28:25,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 17:28:25,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:25,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 17:28:25,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 17:28:25,567 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 17:28:26,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:26,299 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 17:28:26,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 17:28:26,299 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 17:28:26,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:26,300 INFO L225 Difference]: With dead ends: 49 [2020-08-21 17:28:26,301 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 17:28:26,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 17:28:26,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 17:28:26,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 17:28:26,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 17:28:26,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 17:28:26,306 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 17:28:26,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:26,307 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 17:28:26,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 17:28:26,307 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 17:28:26,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 17:28:26,307 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:26,307 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:26,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 17:28:26,308 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:26,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:26,308 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 17:28:26,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:26,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1317026426] [2020-08-21 17:28:26,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:26,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:27,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:27,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:27,239 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:27,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1317026426] [2020-08-21 17:28:27,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:27,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 17:28:27,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528403229] [2020-08-21 17:28:27,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 17:28:27,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:27,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 17:28:27,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 17:28:27,241 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 17:28:27,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:27,995 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 17:28:27,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 17:28:27,995 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 17:28:27,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:27,996 INFO L225 Difference]: With dead ends: 50 [2020-08-21 17:28:27,996 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 17:28:27,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 17:28:27,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 17:28:28,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 17:28:28,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 17:28:28,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 17:28:28,001 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 17:28:28,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:28,001 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 17:28:28,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 17:28:28,001 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 17:28:28,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 17:28:28,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:28,002 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:28,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 17:28:28,003 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:28,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:28,003 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 17:28:28,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:28,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [284712311] [2020-08-21 17:28:28,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:28,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:29,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:29,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:29,018 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:29,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [284712311] [2020-08-21 17:28:29,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:29,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 17:28:29,019 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407539253] [2020-08-21 17:28:29,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 17:28:29,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:29,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 17:28:29,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 17:28:29,020 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 17:28:29,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:29,835 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 17:28:29,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 17:28:29,836 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 17:28:29,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:29,836 INFO L225 Difference]: With dead ends: 51 [2020-08-21 17:28:29,837 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 17:28:29,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 17:28:29,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 17:28:29,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 17:28:29,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 17:28:29,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 17:28:29,842 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 17:28:29,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:29,842 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 17:28:29,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 17:28:29,842 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 17:28:29,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 17:28:29,843 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:29,843 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:29,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 17:28:29,843 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:29,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:29,843 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 17:28:29,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:29,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5134267] [2020-08-21 17:28:29,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:29,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:30,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,860 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:30,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5134267] [2020-08-21 17:28:30,860 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:30,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 17:28:30,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983831230] [2020-08-21 17:28:30,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 17:28:30,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:30,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 17:28:30,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 17:28:30,862 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 17:28:31,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:31,702 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 17:28:31,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 17:28:31,703 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 17:28:31,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:31,704 INFO L225 Difference]: With dead ends: 52 [2020-08-21 17:28:31,704 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 17:28:31,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 17:28:31,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 17:28:31,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 17:28:31,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 17:28:31,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 17:28:31,708 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 17:28:31,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:31,708 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 17:28:31,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 17:28:31,709 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 17:28:31,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 17:28:31,709 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:31,709 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:31,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 17:28:31,710 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:31,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:31,710 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 17:28:31,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:31,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1061494475] [2020-08-21 17:28:31,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:31,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:32,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:32,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:32,769 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:32,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1061494475] [2020-08-21 17:28:32,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:32,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 17:28:32,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156722310] [2020-08-21 17:28:32,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 17:28:32,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:32,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 17:28:32,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 17:28:32,771 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 17:28:33,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:33,692 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 17:28:33,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 17:28:33,694 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 17:28:33,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:33,694 INFO L225 Difference]: With dead ends: 53 [2020-08-21 17:28:33,694 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 17:28:33,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 17:28:33,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 17:28:33,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 17:28:33,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 17:28:33,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 17:28:33,699 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 17:28:33,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:33,699 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 17:28:33,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 17:28:33,699 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 17:28:33,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 17:28:33,700 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:33,700 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:33,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 17:28:33,700 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:33,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:33,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 17:28:33,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:33,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559269207] [2020-08-21 17:28:33,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:33,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:34,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:34,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:34,838 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:34,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559269207] [2020-08-21 17:28:34,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:34,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 17:28:34,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247543814] [2020-08-21 17:28:34,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 17:28:34,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:34,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 17:28:34,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 17:28:34,841 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 17:28:35,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:35,809 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 17:28:35,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 17:28:35,809 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 17:28:35,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:35,810 INFO L225 Difference]: With dead ends: 54 [2020-08-21 17:28:35,810 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 17:28:35,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 17:28:35,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 17:28:35,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 17:28:35,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 17:28:35,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 17:28:35,817 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 17:28:35,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:35,818 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 17:28:35,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 17:28:35,818 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 17:28:35,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 17:28:35,818 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:35,818 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:35,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 17:28:35,819 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:35,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:35,819 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 17:28:35,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:35,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [682544802] [2020-08-21 17:28:35,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:35,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:37,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:37,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:37,013 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:37,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [682544802] [2020-08-21 17:28:37,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:37,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 17:28:37,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688151079] [2020-08-21 17:28:37,014 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 17:28:37,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:37,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 17:28:37,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 17:28:37,016 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 17:28:38,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:38,023 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 17:28:38,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 17:28:38,024 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 17:28:38,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:38,025 INFO L225 Difference]: With dead ends: 55 [2020-08-21 17:28:38,025 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 17:28:38,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 17:28:38,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 17:28:38,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 17:28:38,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 17:28:38,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 17:28:38,031 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 17:28:38,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:38,031 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 17:28:38,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 17:28:38,032 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 17:28:38,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 17:28:38,032 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:38,032 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:38,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 17:28:38,033 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:38,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:38,033 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 17:28:38,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:38,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139545066] [2020-08-21 17:28:38,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:38,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:39,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:39,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:39,253 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:39,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139545066] [2020-08-21 17:28:39,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:39,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 17:28:39,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762666838] [2020-08-21 17:28:39,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 17:28:39,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:39,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 17:28:39,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 17:28:39,256 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 17:28:40,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:40,331 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 17:28:40,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 17:28:40,332 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 17:28:40,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:40,333 INFO L225 Difference]: With dead ends: 56 [2020-08-21 17:28:40,333 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 17:28:40,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 17:28:40,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 17:28:40,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 17:28:40,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 17:28:40,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 17:28:40,337 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 17:28:40,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:40,338 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 17:28:40,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 17:28:40,338 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 17:28:40,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 17:28:40,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:40,339 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:40,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 17:28:40,339 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:40,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:40,339 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 17:28:40,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:40,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1467696236] [2020-08-21 17:28:40,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:40,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:41,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:41,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:41,630 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:41,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1467696236] [2020-08-21 17:28:41,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:41,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 17:28:41,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302866244] [2020-08-21 17:28:41,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 17:28:41,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:41,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 17:28:41,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 17:28:41,632 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 17:28:42,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:42,754 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 17:28:42,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 17:28:42,755 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 17:28:42,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:42,756 INFO L225 Difference]: With dead ends: 57 [2020-08-21 17:28:42,756 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 17:28:42,757 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 17:28:42,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 17:28:42,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 17:28:42,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 17:28:42,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 17:28:42,761 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 17:28:42,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:42,762 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 17:28:42,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 17:28:42,762 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 17:28:42,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 17:28:42,763 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:42,763 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:42,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 17:28:42,764 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:42,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:42,765 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 17:28:42,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:42,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1781098737] [2020-08-21 17:28:42,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:42,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:44,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:44,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:44,344 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:44,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1781098737] [2020-08-21 17:28:44,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:44,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 17:28:44,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431908155] [2020-08-21 17:28:44,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 17:28:44,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:44,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 17:28:44,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 17:28:44,347 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 17:28:45,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:45,504 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 17:28:45,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 17:28:45,504 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 17:28:45,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:45,506 INFO L225 Difference]: With dead ends: 58 [2020-08-21 17:28:45,506 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 17:28:45,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 17:28:45,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 17:28:45,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 17:28:45,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 17:28:45,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 17:28:45,511 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 17:28:45,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:45,511 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 17:28:45,511 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 17:28:45,511 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 17:28:45,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 17:28:45,512 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:45,512 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:45,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 17:28:45,512 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:45,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:45,512 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 17:28:45,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:45,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1329274706] [2020-08-21 17:28:45,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:45,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:46,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:46,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:46,963 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:46,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1329274706] [2020-08-21 17:28:46,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:46,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 17:28:46,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870986090] [2020-08-21 17:28:46,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 17:28:46,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:46,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 17:28:46,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 17:28:46,965 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 17:28:48,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:48,193 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 17:28:48,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 17:28:48,195 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 17:28:48,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:48,196 INFO L225 Difference]: With dead ends: 59 [2020-08-21 17:28:48,196 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 17:28:48,198 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 17:28:48,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 17:28:48,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 17:28:48,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 17:28:48,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 17:28:48,202 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 17:28:48,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:48,202 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 17:28:48,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 17:28:48,203 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 17:28:48,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 17:28:48,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:48,203 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:48,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 17:28:48,203 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:48,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:48,204 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 17:28:48,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:48,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650028820] [2020-08-21 17:28:48,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:48,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:49,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:49,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:49,701 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:49,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650028820] [2020-08-21 17:28:49,701 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:49,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 17:28:49,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500472050] [2020-08-21 17:28:49,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 17:28:49,702 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:49,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 17:28:49,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 17:28:49,703 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 17:28:50,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:50,993 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 17:28:50,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 17:28:50,994 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 17:28:50,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:50,994 INFO L225 Difference]: With dead ends: 60 [2020-08-21 17:28:50,995 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 17:28:50,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 17:28:50,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 17:28:50,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 17:28:50,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 17:28:50,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 17:28:50,999 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 17:28:50,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:50,999 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 17:28:50,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 17:28:50,999 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 17:28:50,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 17:28:50,999 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:51,000 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:51,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 17:28:51,000 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:51,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:51,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 17:28:51,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:51,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937967748] [2020-08-21 17:28:51,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:51,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:52,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:52,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:52,527 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:52,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937967748] [2020-08-21 17:28:52,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:52,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 17:28:52,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46562482] [2020-08-21 17:28:52,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 17:28:52,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:52,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 17:28:52,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 17:28:52,528 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 17:28:53,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:53,842 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 17:28:53,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 17:28:53,842 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 17:28:53,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:53,843 INFO L225 Difference]: With dead ends: 61 [2020-08-21 17:28:53,843 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 17:28:53,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 17:28:53,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 17:28:53,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 17:28:53,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 17:28:53,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 17:28:53,848 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 17:28:53,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:53,848 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 17:28:53,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 17:28:53,848 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 17:28:53,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 17:28:53,848 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:53,848 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:53,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 17:28:53,849 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:53,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:53,849 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 17:28:53,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:53,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1417069617] [2020-08-21 17:28:53,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:53,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:55,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:55,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:55,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:55,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1417069617] [2020-08-21 17:28:55,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:55,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 17:28:55,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339824260] [2020-08-21 17:28:55,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 17:28:55,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:55,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 17:28:55,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 17:28:55,405 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 17:28:56,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:56,776 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 17:28:56,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 17:28:56,777 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 17:28:56,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:56,778 INFO L225 Difference]: With dead ends: 62 [2020-08-21 17:28:56,778 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 17:28:56,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 17:28:56,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 17:28:56,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 17:28:56,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 17:28:56,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 17:28:56,782 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 17:28:56,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:56,783 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 17:28:56,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 17:28:56,783 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 17:28:56,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 17:28:56,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:56,784 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:56,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 17:28:56,784 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:56,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:56,784 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 17:28:56,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:56,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1320994958] [2020-08-21 17:28:56,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:56,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:58,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:58,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:58,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:58,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1320994958] [2020-08-21 17:28:58,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:58,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 17:28:58,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889011017] [2020-08-21 17:28:58,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 17:28:58,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:58,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 17:28:58,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 17:28:58,465 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 17:28:59,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:59,910 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 17:28:59,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 17:28:59,910 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 17:28:59,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:59,911 INFO L225 Difference]: With dead ends: 63 [2020-08-21 17:28:59,911 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 17:28:59,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 17:28:59,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 17:28:59,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 17:28:59,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 17:28:59,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 17:28:59,915 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 17:28:59,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:59,916 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 17:28:59,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 17:28:59,916 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 17:28:59,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 17:28:59,916 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:59,917 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:59,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 17:28:59,917 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:59,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:59,917 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 17:28:59,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:59,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215974318] [2020-08-21 17:28:59,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:59,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:01,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:29:01,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:29:01,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:29:01,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215974318] [2020-08-21 17:29:01,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:29:01,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 17:29:01,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541559018] [2020-08-21 17:29:01,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 17:29:01,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:29:01,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 17:29:01,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 17:29:01,689 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.