/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 log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 14:13:51,970 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 14:13:51,973 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 14:13:52,003 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 14:13:52,004 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 14:13:52,005 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 14:13:52,006 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 14:13:52,008 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 14:13:52,010 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 14:13:52,011 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 14:13:52,012 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 14:13:52,013 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 14:13:52,013 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 14:13:52,015 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 14:13:52,016 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 14:13:52,017 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 14:13:52,018 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 14:13:52,019 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 14:13:52,021 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 14:13:52,023 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 14:13:52,024 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 14:13:52,026 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 14:13:52,027 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 14:13:52,028 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 14:13:52,030 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 14:13:52,039 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 14:13:52,040 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 14:13:52,041 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 14:13:52,042 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 14:13:52,072 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 14:13:52,072 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 14:13:52,075 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 14:13:52,075 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 14:13:52,076 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 14:13:52,077 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 14:13:52,077 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 14:13:52,077 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 14:13:52,077 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 14:13:52,077 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 14:13:52,077 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 14:13:52,078 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 14:13:52,078 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 14:13:52,078 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 14:13:52,078 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 14:13:52,078 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 14:13:52,080 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 14:13:52,080 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 14:13:52,080 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 14:13:52,081 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 14:13:52,081 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 14:13:52,081 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:13:52,082 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 14:13:52,082 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 14:13:52,082 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 14:13:52,082 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 14:13:52,083 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 14:13:52,083 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 14:13:52,083 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 14:13:52,083 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 -> log-additional-information=true; [2020-08-21 14:13:52,377 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 14:13:52,390 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 14:13:52,393 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 14:13:52,395 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 14:13:52,395 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 14:13:52,396 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 14:13:52,472 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ecc4153c2/5bf1a6e713d84648aa911a295fc1f563/FLAG4dfa38c43 [2020-08-21 14:13:52,966 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 14:13:52,967 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 14:13:52,975 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ecc4153c2/5bf1a6e713d84648aa911a295fc1f563/FLAG4dfa38c43 [2020-08-21 14:13:53,314 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ecc4153c2/5bf1a6e713d84648aa911a295fc1f563 [2020-08-21 14:13:53,325 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 14:13:53,327 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 14:13:53,330 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 14:13:53,330 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 14:13:53,334 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 14:13:53,335 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:13:53" (1/1) ... [2020-08-21 14:13:53,338 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75a18185 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:13:53, skipping insertion in model container [2020-08-21 14:13:53,339 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:13:53" (1/1) ... [2020-08-21 14:13:53,348 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 14:13:53,369 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 14:13:53,542 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:13:53,549 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 14:13:53,571 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:13:53,587 INFO L208 MainTranslator]: Completed translation [2020-08-21 14:13:53,587 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:13:53 WrapperNode [2020-08-21 14:13:53,587 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 14:13:53,588 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 14:13:53,588 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 14:13:53,588 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 14:13:53,687 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:13:53" (1/1) ... [2020-08-21 14:13:53,688 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:13:53" (1/1) ... [2020-08-21 14:13:53,699 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:13:53" (1/1) ... [2020-08-21 14:13:53,699 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:13:53" (1/1) ... [2020-08-21 14:13:53,710 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:13:53" (1/1) ... [2020-08-21 14:13:53,715 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:13:53" (1/1) ... [2020-08-21 14:13:53,718 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:13:53" (1/1) ... [2020-08-21 14:13:53,720 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 14:13:53,720 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 14:13:53,720 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 14:13:53,721 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 14:13:53,721 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:13:53" (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 14:13:53,779 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 14:13:53,780 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 14:13:53,780 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 14:13:53,780 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 14:13:53,780 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 14:13:53,781 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 14:13:53,781 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 14:13:53,781 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 14:13:53,781 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-21 14:13:53,782 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 14:13:53,783 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 14:13:53,783 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 14:13:53,783 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 14:13:53,783 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 14:13:53,783 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 14:13:53,784 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 14:13:53,784 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 14:13:53,785 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 14:13:54,063 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 14:13:54,063 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 14:13:54,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:13:54 BoogieIcfgContainer [2020-08-21 14:13:54,069 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 14:13:54,071 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 14:13:54,071 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 14:13:54,076 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 14:13:54,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:13:53" (1/3) ... [2020-08-21 14:13:54,077 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fc434c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:13:54, skipping insertion in model container [2020-08-21 14:13:54,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:13:53" (2/3) ... [2020-08-21 14:13:54,078 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fc434c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:13:54, skipping insertion in model container [2020-08-21 14:13:54,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:13:54" (3/3) ... [2020-08-21 14:13:54,081 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-21 14:13:54,096 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 14:13:54,105 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 14:13:54,121 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 14:13:54,147 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 14:13:54,147 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 14:13:54,147 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 14:13:54,148 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 14:13:54,148 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 14:13:54,148 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 14:13:54,148 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 14:13:54,148 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 14:13:54,174 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 14:13:54,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 14:13:54,181 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:54,182 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:54,182 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:54,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:54,191 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-21 14:13:54,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:54,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1982241918] [2020-08-21 14:13:54,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:54,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:54,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:54,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:54,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:54,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:54,424 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 14:13:54,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1982241918] [2020-08-21 14:13:54,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:13:54,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 14:13:54,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464024921] [2020-08-21 14:13:54,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 14:13:54,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:54,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 14:13:54,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 14:13:54,454 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 14:13:54,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:54,608 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 14:13:54,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 14:13:54,610 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 14:13:54,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:54,622 INFO L225 Difference]: With dead ends: 59 [2020-08-21 14:13:54,622 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 14:13:54,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:13:54,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 14:13:54,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 14:13:54,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 14:13:54,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 14:13:54,673 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 14:13:54,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:54,674 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 14:13:54,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 14:13:54,675 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 14:13:54,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 14:13:54,676 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:54,676 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:54,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 14:13:54,677 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:54,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:54,678 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-21 14:13:54,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:54,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1982964023] [2020-08-21 14:13:54,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:54,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:54,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:54,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:54,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:54,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:54,919 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 14:13:54,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1982964023] [2020-08-21 14:13:54,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:13:54,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 14:13:54,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749584105] [2020-08-21 14:13:54,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 14:13:54,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:54,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 14:13:54,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:13:54,923 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 14:13:55,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:55,125 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 14:13:55,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 14:13:55,126 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 14:13:55,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:55,127 INFO L225 Difference]: With dead ends: 48 [2020-08-21 14:13:55,128 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 14:13:55,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:13:55,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 14:13:55,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 14:13:55,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 14:13:55,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 14:13:55,138 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 14:13:55,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:55,139 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 14:13:55,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 14:13:55,139 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 14:13:55,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 14:13:55,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:55,141 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:55,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 14:13:55,141 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:55,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:55,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-21 14:13:55,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:55,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460318845] [2020-08-21 14:13:55,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:55,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:55,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:55,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:55,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:55,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:55,332 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 14:13:55,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460318845] [2020-08-21 14:13:55,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:13:55,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 14:13:55,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559684627] [2020-08-21 14:13:55,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 14:13:55,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:55,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 14:13:55,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:13:55,335 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 14:13:55,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:55,496 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 14:13:55,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 14:13:55,496 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 14:13:55,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:55,498 INFO L225 Difference]: With dead ends: 50 [2020-08-21 14:13:55,498 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 14:13:55,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:13:55,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 14:13:55,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 14:13:55,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 14:13:55,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 14:13:55,507 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 14:13:55,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:55,507 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 14:13:55,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 14:13:55,507 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 14:13:55,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 14:13:55,508 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:55,509 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:55,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 14:13:55,509 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:55,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:55,510 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-21 14:13:55,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:55,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1201923264] [2020-08-21 14:13:55,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:55,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:55,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:55,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:55,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:55,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:55,794 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:13:55,794 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1201923264] [2020-08-21 14:13:55,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:13:55,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 14:13:55,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678041029] [2020-08-21 14:13:55,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 14:13:55,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:55,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 14:13:55,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 14:13:55,798 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 14:13:55,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:55,986 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 14:13:55,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 14:13:55,987 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 14:13:55,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:55,988 INFO L225 Difference]: With dead ends: 52 [2020-08-21 14:13:55,989 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 14:13:55,989 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 14:13:55,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 14:13:55,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 14:13:55,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 14:13:55,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 14:13:55,997 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 14:13:55,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:55,997 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 14:13:55,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 14:13:55,997 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 14:13:55,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 14:13:55,998 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:55,999 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:55,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 14:13:55,999 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:56,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:56,000 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-21 14:13:56,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:56,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1308802406] [2020-08-21 14:13:56,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:56,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:56,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:56,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:56,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:56,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:56,239 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:13:56,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1308802406] [2020-08-21 14:13:56,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:13:56,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 14:13:56,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104957049] [2020-08-21 14:13:56,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 14:13:56,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:56,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 14:13:56,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:13:56,242 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 14:13:56,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:56,438 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 14:13:56,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 14:13:56,438 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 14:13:56,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:56,439 INFO L225 Difference]: With dead ends: 54 [2020-08-21 14:13:56,440 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 14:13:56,440 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-21 14:13:56,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 14:13:56,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 14:13:56,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 14:13:56,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 14:13:56,447 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 14:13:56,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:56,447 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 14:13:56,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 14:13:56,448 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 14:13:56,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 14:13:56,449 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:56,449 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:56,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 14:13:56,449 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:56,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:56,450 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-21 14:13:56,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:56,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1022106385] [2020-08-21 14:13:56,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:56,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:56,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:56,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:56,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:56,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:56,681 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:13:56,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1022106385] [2020-08-21 14:13:56,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:13:56,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 14:13:56,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300865108] [2020-08-21 14:13:56,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 14:13:56,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:56,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 14:13:56,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:13:56,684 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 14:13:56,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:56,878 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 14:13:56,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 14:13:56,878 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 14:13:56,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:56,879 INFO L225 Difference]: With dead ends: 56 [2020-08-21 14:13:56,880 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 14:13:56,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:13:56,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 14:13:56,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 14:13:56,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 14:13:56,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 14:13:56,887 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 14:13:56,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:56,887 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 14:13:56,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 14:13:56,887 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 14:13:56,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 14:13:56,888 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:56,889 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:56,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 14:13:56,889 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:56,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:56,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-21 14:13:56,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:56,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487334112] [2020-08-21 14:13:56,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:56,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:56,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:56,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:56,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:56,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:57,172 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:13:57,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487334112] [2020-08-21 14:13:57,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:13:57,173 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 14:13:57,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591071083] [2020-08-21 14:13:57,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 14:13:57,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:57,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 14:13:57,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 14:13:57,174 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 14:13:57,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:57,375 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 14:13:57,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 14:13:57,376 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 14:13:57,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:57,377 INFO L225 Difference]: With dead ends: 58 [2020-08-21 14:13:57,377 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 14:13:57,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-21 14:13:57,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 14:13:57,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 14:13:57,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 14:13:57,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 14:13:57,385 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 14:13:57,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:57,385 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 14:13:57,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 14:13:57,385 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 14:13:57,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 14:13:57,386 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:57,386 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:57,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 14:13:57,387 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:57,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:57,387 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-21 14:13:57,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:57,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [245705043] [2020-08-21 14:13:57,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:57,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:57,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:57,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:57,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:57,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:57,701 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 14:13:57,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [245705043] [2020-08-21 14:13:57,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:13:57,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 14:13:57,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720520317] [2020-08-21 14:13:57,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 14:13:57,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:57,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 14:13:57,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 14:13:57,704 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 14:13:57,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:57,907 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 14:13:57,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 14:13:57,908 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 14:13:57,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:57,910 INFO L225 Difference]: With dead ends: 60 [2020-08-21 14:13:57,911 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 14:13:57,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-21 14:13:57,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 14:13:57,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 14:13:57,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 14:13:57,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 14:13:57,922 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 14:13:57,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:57,923 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 14:13:57,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 14:13:57,923 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 14:13:57,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 14:13:57,925 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:57,925 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:57,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 14:13:57,926 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:57,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:57,929 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-21 14:13:57,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:57,930 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815132423] [2020-08-21 14:13:57,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:57,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:57,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:57,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:57,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:57,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:58,305 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:13:58,306 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815132423] [2020-08-21 14:13:58,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:13:58,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 14:13:58,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236707095] [2020-08-21 14:13:58,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:13:58,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:58,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:13:58,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:13:58,308 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 14:13:58,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:58,505 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 14:13:58,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 14:13:58,506 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 14:13:58,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:58,507 INFO L225 Difference]: With dead ends: 62 [2020-08-21 14:13:58,507 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 14:13:58,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-21 14:13:58,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 14:13:58,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 14:13:58,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 14:13:58,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 14:13:58,514 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 14:13:58,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:58,514 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 14:13:58,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:13:58,514 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 14:13:58,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 14:13:58,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:58,515 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:58,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 14:13:58,516 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:58,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:58,516 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-21 14:13:58,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:58,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418093026] [2020-08-21 14:13:58,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:58,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:58,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:58,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:58,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:58,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:58,882 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:13:58,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418093026] [2020-08-21 14:13:58,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:13:58,883 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 14:13:58,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673400424] [2020-08-21 14:13:58,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 14:13:58,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:58,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 14:13:58,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 14:13:58,884 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 14:13:59,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:59,120 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 14:13:59,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 14:13:59,121 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 14:13:59,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:59,122 INFO L225 Difference]: With dead ends: 64 [2020-08-21 14:13:59,122 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 14:13:59,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-21 14:13:59,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 14:13:59,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 14:13:59,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 14:13:59,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 14:13:59,136 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 14:13:59,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:59,136 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 14:13:59,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 14:13:59,136 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 14:13:59,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 14:13:59,138 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:59,139 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:59,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 14:13:59,139 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:59,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:59,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-21 14:13:59,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:59,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960267661] [2020-08-21 14:13:59,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:59,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:59,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:59,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:59,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:59,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:59,246 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 14:13:59,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960267661] [2020-08-21 14:13:59,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:13:59,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 14:13:59,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986919500] [2020-08-21 14:13:59,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 14:13:59,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:59,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 14:13:59,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:13:59,249 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 14:13:59,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:59,326 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 14:13:59,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 14:13:59,327 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 14:13:59,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:59,329 INFO L225 Difference]: With dead ends: 65 [2020-08-21 14:13:59,329 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 14:13:59,330 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:13:59,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 14:13:59,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 14:13:59,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 14:13:59,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 14:13:59,340 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 14:13:59,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:59,341 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 14:13:59,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 14:13:59,341 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 14:13:59,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 14:13:59,342 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:59,342 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:59,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 14:13:59,342 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:59,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:59,343 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-21 14:13:59,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:59,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790495433] [2020-08-21 14:13:59,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:59,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:59,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:59,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:59,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:59,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:59,412 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 14:13:59,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [790495433] [2020-08-21 14:13:59,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:13:59,413 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 14:13:59,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541821147] [2020-08-21 14:13:59,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 14:13:59,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:59,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 14:13:59,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:13:59,415 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 14:13:59,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:59,522 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 14:13:59,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 14:13:59,523 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 14:13:59,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:59,525 INFO L225 Difference]: With dead ends: 73 [2020-08-21 14:13:59,525 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 14:13:59,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:13:59,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 14:13:59,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 14:13:59,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 14:13:59,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 14:13:59,532 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 14:13:59,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:59,533 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 14:13:59,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 14:13:59,533 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 14:13:59,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 14:13:59,534 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:59,534 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:59,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 14:13:59,534 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:59,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:59,535 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-21 14:13:59,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:59,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [815061644] [2020-08-21 14:13:59,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:59,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:59,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:59,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:59,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:59,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:59,614 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-21 14:13:59,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [815061644] [2020-08-21 14:13:59,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:13:59,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 14:13:59,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051905373] [2020-08-21 14:13:59,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 14:13:59,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:13:59,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 14:13:59,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:13:59,617 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 14:13:59,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:13:59,714 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 14:13:59,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 14:13:59,714 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 14:13:59,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:13:59,716 INFO L225 Difference]: With dead ends: 69 [2020-08-21 14:13:59,716 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 14:13:59,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:13:59,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 14:13:59,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 14:13:59,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 14:13:59,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 14:13:59,731 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 14:13:59,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:13:59,732 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 14:13:59,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 14:13:59,732 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 14:13:59,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 14:13:59,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:13:59,734 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:13:59,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 14:13:59,734 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:13:59,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:13:59,735 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-21 14:13:59,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:13:59,740 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1494805227] [2020-08-21 14:13:59,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:13:59,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:59,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:13:59,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:13:59,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:13:59,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:00,228 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:00,228 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1494805227] [2020-08-21 14:14:00,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:00,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 14:14:00,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808247322] [2020-08-21 14:14:00,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 14:14:00,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:00,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 14:14:00,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 14:14:00,230 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 14:14:00,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:00,471 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 14:14:00,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 14:14:00,471 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 14:14:00,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:00,473 INFO L225 Difference]: With dead ends: 74 [2020-08-21 14:14:00,473 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 14:14:00,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-21 14:14:00,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 14:14:00,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 14:14:00,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 14:14:00,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 14:14:00,480 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 14:14:00,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:00,481 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 14:14:00,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 14:14:00,481 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 14:14:00,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 14:14:00,482 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:00,482 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:00,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 14:14:00,482 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:00,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:00,483 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-21 14:14:00,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:00,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780364782] [2020-08-21 14:14:00,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:00,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:00,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:00,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:00,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:00,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:01,047 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:01,048 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780364782] [2020-08-21 14:14:01,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:01,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 14:14:01,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863752026] [2020-08-21 14:14:01,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 14:14:01,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:01,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 14:14:01,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 14:14:01,050 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 14:14:01,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:01,292 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 14:14:01,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 14:14:01,293 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 14:14:01,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:01,293 INFO L225 Difference]: With dead ends: 76 [2020-08-21 14:14:01,293 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 14:14:01,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-21 14:14:01,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 14:14:01,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 14:14:01,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 14:14:01,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 14:14:01,302 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 14:14:01,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:01,302 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 14:14:01,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 14:14:01,302 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 14:14:01,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 14:14:01,303 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:01,303 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:01,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 14:14:01,304 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:01,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:01,304 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-21 14:14:01,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:01,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472665258] [2020-08-21 14:14:01,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:01,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:01,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:01,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:01,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:01,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:01,863 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:01,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472665258] [2020-08-21 14:14:01,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:01,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 14:14:01,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625353125] [2020-08-21 14:14:01,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 14:14:01,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:01,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 14:14:01,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 14:14:01,868 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 14:14:02,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:02,091 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 14:14:02,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 14:14:02,092 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 14:14:02,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:02,093 INFO L225 Difference]: With dead ends: 78 [2020-08-21 14:14:02,093 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 14:14:02,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-21 14:14:02,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 14:14:02,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 14:14:02,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 14:14:02,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 14:14:02,098 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 14:14:02,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:02,099 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 14:14:02,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 14:14:02,099 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 14:14:02,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 14:14:02,100 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:02,100 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:02,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 14:14:02,100 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:02,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:02,101 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-21 14:14:02,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:02,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [768432607] [2020-08-21 14:14:02,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:02,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:02,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:02,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:02,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:02,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:02,648 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:02,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [768432607] [2020-08-21 14:14:02,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:02,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 14:14:02,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591966186] [2020-08-21 14:14:02,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 14:14:02,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:02,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 14:14:02,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 14:14:02,651 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 14:14:02,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:02,900 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 14:14:02,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 14:14:02,900 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 14:14:02,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:02,901 INFO L225 Difference]: With dead ends: 80 [2020-08-21 14:14:02,902 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 14:14:02,904 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-21 14:14:02,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 14:14:02,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 14:14:02,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 14:14:02,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 14:14:02,912 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 14:14:02,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:02,912 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 14:14:02,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 14:14:02,912 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 14:14:02,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 14:14:02,913 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:02,913 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:02,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 14:14:02,914 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:02,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:02,914 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-21 14:14:02,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:02,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029553235] [2020-08-21 14:14:02,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:02,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:02,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:02,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:02,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:02,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:03,542 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:03,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029553235] [2020-08-21 14:14:03,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:03,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 14:14:03,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684328093] [2020-08-21 14:14:03,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 14:14:03,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:03,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 14:14:03,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 14:14:03,544 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 14:14:03,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:03,805 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 14:14:03,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 14:14:03,805 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 14:14:03,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:03,806 INFO L225 Difference]: With dead ends: 82 [2020-08-21 14:14:03,806 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 14:14:03,807 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-21 14:14:03,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 14:14:03,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 14:14:03,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 14:14:03,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 14:14:03,813 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 14:14:03,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:03,813 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 14:14:03,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 14:14:03,814 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 14:14:03,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 14:14:03,815 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:03,815 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:03,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 14:14:03,816 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:03,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:03,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-21 14:14:03,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:03,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182886617] [2020-08-21 14:14:03,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:03,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:03,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:03,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:03,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:03,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:04,515 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:04,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182886617] [2020-08-21 14:14:04,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:04,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 14:14:04,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91779762] [2020-08-21 14:14:04,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 14:14:04,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:04,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 14:14:04,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 14:14:04,518 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 14:14:04,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:04,797 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 14:14:04,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 14:14:04,804 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 14:14:04,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:04,805 INFO L225 Difference]: With dead ends: 84 [2020-08-21 14:14:04,805 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 14:14:04,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-21 14:14:04,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 14:14:04,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 14:14:04,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 14:14:04,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 14:14:04,810 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 14:14:04,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:04,810 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 14:14:04,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 14:14:04,811 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 14:14:04,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 14:14:04,811 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:04,812 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:04,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 14:14:04,812 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:04,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:04,813 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-21 14:14:04,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:04,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1221573713] [2020-08-21 14:14:04,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:04,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:04,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:04,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:04,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:04,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:05,579 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:05,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1221573713] [2020-08-21 14:14:05,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:05,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 14:14:05,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271904184] [2020-08-21 14:14:05,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 14:14:05,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:05,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 14:14:05,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 14:14:05,581 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 14:14:05,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:05,819 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 14:14:05,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 14:14:05,819 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 14:14:05,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:05,820 INFO L225 Difference]: With dead ends: 86 [2020-08-21 14:14:05,820 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 14:14:05,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-21 14:14:05,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 14:14:05,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 14:14:05,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 14:14:05,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 14:14:05,826 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 14:14:05,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:05,827 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 14:14:05,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 14:14:05,827 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 14:14:05,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 14:14:05,828 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:05,828 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:05,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 14:14:05,828 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:05,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:05,829 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-21 14:14:05,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:05,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1111270051] [2020-08-21 14:14:05,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:05,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:05,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:05,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:05,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:05,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:06,592 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:06,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1111270051] [2020-08-21 14:14:06,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:06,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 14:14:06,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687777830] [2020-08-21 14:14:06,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 14:14:06,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:06,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 14:14:06,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 14:14:06,595 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 14:14:06,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:06,924 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 14:14:06,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 14:14:06,925 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 14:14:06,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:06,926 INFO L225 Difference]: With dead ends: 88 [2020-08-21 14:14:06,926 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 14:14:06,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-21 14:14:06,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 14:14:06,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 14:14:06,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 14:14:06,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 14:14:06,932 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 14:14:06,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:06,932 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 14:14:06,932 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 14:14:06,932 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 14:14:06,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 14:14:06,933 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:06,933 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:06,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 14:14:06,934 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:06,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:06,934 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-21 14:14:06,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:06,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [124741572] [2020-08-21 14:14:06,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:06,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:06,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:06,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:06,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:06,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:07,969 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:07,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [124741572] [2020-08-21 14:14:07,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:07,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 14:14:07,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776883214] [2020-08-21 14:14:07,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 14:14:07,970 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:07,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 14:14:07,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 14:14:07,971 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 14:14:08,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:08,258 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 14:14:08,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 14:14:08,261 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 14:14:08,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:08,262 INFO L225 Difference]: With dead ends: 90 [2020-08-21 14:14:08,262 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 14:14:08,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-21 14:14:08,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 14:14:08,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 14:14:08,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 14:14:08,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 14:14:08,268 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 14:14:08,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:08,268 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 14:14:08,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 14:14:08,268 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 14:14:08,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 14:14:08,269 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:08,269 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:08,269 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 14:14:08,270 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:08,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:08,270 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-21 14:14:08,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:08,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [954788483] [2020-08-21 14:14:08,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:08,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:08,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:08,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:08,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:08,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:09,168 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:09,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [954788483] [2020-08-21 14:14:09,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:09,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 14:14:09,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762763969] [2020-08-21 14:14:09,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 14:14:09,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:09,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 14:14:09,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 14:14:09,170 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 14:14:09,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:09,463 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 14:14:09,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 14:14:09,463 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 14:14:09,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:09,464 INFO L225 Difference]: With dead ends: 92 [2020-08-21 14:14:09,464 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 14:14:09,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-21 14:14:09,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 14:14:09,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 14:14:09,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 14:14:09,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 14:14:09,469 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 14:14:09,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:09,470 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 14:14:09,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 14:14:09,470 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 14:14:09,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 14:14:09,471 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:09,471 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:09,471 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 14:14:09,471 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:09,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:09,472 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-21 14:14:09,472 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:09,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [991792932] [2020-08-21 14:14:09,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:09,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:09,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:09,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:09,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:09,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:10,444 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:10,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [991792932] [2020-08-21 14:14:10,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:10,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 14:14:10,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937847943] [2020-08-21 14:14:10,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 14:14:10,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:10,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 14:14:10,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 14:14:10,446 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 14:14:10,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:10,777 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 14:14:10,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 14:14:10,778 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 14:14:10,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:10,779 INFO L225 Difference]: With dead ends: 94 [2020-08-21 14:14:10,779 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 14:14:10,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-21 14:14:10,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 14:14:10,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 14:14:10,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 14:14:10,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 14:14:10,785 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 14:14:10,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:10,786 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 14:14:10,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 14:14:10,786 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 14:14:10,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 14:14:10,787 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:10,787 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:10,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 14:14:10,787 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:10,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:10,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-21 14:14:10,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:10,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [414615756] [2020-08-21 14:14:10,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:10,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:10,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:10,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:10,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:10,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:12,002 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:12,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [414615756] [2020-08-21 14:14:12,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:12,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 14:14:12,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635823782] [2020-08-21 14:14:12,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 14:14:12,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:12,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 14:14:12,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 14:14:12,005 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 14:14:12,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:12,365 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 14:14:12,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 14:14:12,366 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 14:14:12,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:12,367 INFO L225 Difference]: With dead ends: 96 [2020-08-21 14:14:12,367 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 14:14:12,368 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-21 14:14:12,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 14:14:12,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 14:14:12,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 14:14:12,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 14:14:12,372 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 14:14:12,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:12,373 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 14:14:12,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 14:14:12,373 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 14:14:12,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 14:14:12,374 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:12,374 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:12,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 14:14:12,374 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:12,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:12,375 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-21 14:14:12,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:12,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171102365] [2020-08-21 14:14:12,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:12,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:12,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:12,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:12,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:12,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:13,422 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:13,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171102365] [2020-08-21 14:14:13,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:13,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 14:14:13,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123156730] [2020-08-21 14:14:13,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 14:14:13,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:13,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 14:14:13,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 14:14:13,424 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 14:14:13,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:13,681 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 14:14:13,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 14:14:13,681 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 14:14:13,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:13,682 INFO L225 Difference]: With dead ends: 98 [2020-08-21 14:14:13,682 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 14:14:13,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-21 14:14:13,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 14:14:13,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 14:14:13,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 14:14:13,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 14:14:13,688 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 14:14:13,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:13,688 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 14:14:13,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 14:14:13,689 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 14:14:13,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 14:14:13,689 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:13,689 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:13,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 14:14:13,690 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:13,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:13,690 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-21 14:14:13,690 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:13,691 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1647804729] [2020-08-21 14:14:13,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:13,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:13,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:13,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:13,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:13,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:14,884 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:14,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1647804729] [2020-08-21 14:14:14,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:14,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 14:14:14,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076614039] [2020-08-21 14:14:14,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 14:14:14,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:14,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 14:14:14,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 14:14:14,886 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 14:14:15,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:15,216 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 14:14:15,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 14:14:15,217 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 14:14:15,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:15,218 INFO L225 Difference]: With dead ends: 100 [2020-08-21 14:14:15,218 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 14:14:15,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-21 14:14:15,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 14:14:15,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 14:14:15,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 14:14:15,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 14:14:15,227 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 14:14:15,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:15,227 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 14:14:15,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 14:14:15,227 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 14:14:15,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 14:14:15,228 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:15,228 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:15,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 14:14:15,229 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:15,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:15,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-21 14:14:15,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:15,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182438596] [2020-08-21 14:14:15,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:15,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:15,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:15,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:15,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:15,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:16,474 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:16,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182438596] [2020-08-21 14:14:16,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:16,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 14:14:16,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020547635] [2020-08-21 14:14:16,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 14:14:16,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:16,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 14:14:16,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 14:14:16,477 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 14:14:16,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:16,856 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 14:14:16,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 14:14:16,857 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 14:14:16,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:16,858 INFO L225 Difference]: With dead ends: 102 [2020-08-21 14:14:16,858 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 14:14:16,859 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-21 14:14:16,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 14:14:16,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 14:14:16,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 14:14:16,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 14:14:16,865 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 14:14:16,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:16,865 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 14:14:16,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 14:14:16,865 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 14:14:16,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 14:14:16,866 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:16,866 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:16,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 14:14:16,866 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:16,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:16,867 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-21 14:14:16,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:16,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156374684] [2020-08-21 14:14:16,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:16,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:16,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:16,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:16,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:16,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:18,206 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:18,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156374684] [2020-08-21 14:14:18,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:18,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 14:14:18,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459948298] [2020-08-21 14:14:18,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 14:14:18,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:18,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 14:14:18,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 14:14:18,208 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 14:14:18,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:18,488 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 14:14:18,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 14:14:18,488 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 14:14:18,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:18,489 INFO L225 Difference]: With dead ends: 104 [2020-08-21 14:14:18,489 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 14:14:18,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 14:14:18,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 14:14:18,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 14:14:18,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 14:14:18,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 14:14:18,495 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 14:14:18,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:18,496 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 14:14:18,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 14:14:18,496 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 14:14:18,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 14:14:18,496 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:18,496 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:18,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 14:14:18,496 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:18,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:18,497 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-21 14:14:18,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:18,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [732788264] [2020-08-21 14:14:18,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:18,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:18,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:18,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:18,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:18,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:19,871 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:19,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [732788264] [2020-08-21 14:14:19,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:19,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 14:14:19,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379104642] [2020-08-21 14:14:19,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 14:14:19,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:19,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 14:14:19,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 14:14:19,874 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 14:14:20,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:20,304 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 14:14:20,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 14:14:20,305 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 14:14:20,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:20,306 INFO L225 Difference]: With dead ends: 106 [2020-08-21 14:14:20,306 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 14:14:20,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 14:14:20,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 14:14:20,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 14:14:20,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 14:14:20,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 14:14:20,311 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 14:14:20,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:20,311 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 14:14:20,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 14:14:20,312 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 14:14:20,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 14:14:20,312 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:20,312 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:20,313 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 14:14:20,313 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:20,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:20,313 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-21 14:14:20,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:20,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1183891368] [2020-08-21 14:14:20,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:20,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:20,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:20,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:20,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:20,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:21,752 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:21,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1183891368] [2020-08-21 14:14:21,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:21,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 14:14:21,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198076797] [2020-08-21 14:14:21,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 14:14:21,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:21,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 14:14:21,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 14:14:21,754 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 14:14:22,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:22,193 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 14:14:22,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 14:14:22,193 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 14:14:22,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:22,195 INFO L225 Difference]: With dead ends: 108 [2020-08-21 14:14:22,195 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 14:14:22,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 14:14:22,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 14:14:22,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 14:14:22,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 14:14:22,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 14:14:22,201 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 14:14:22,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:22,201 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 14:14:22,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 14:14:22,202 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 14:14:22,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 14:14:22,202 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:22,202 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:22,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 14:14:22,203 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:22,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:22,203 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-21 14:14:22,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:22,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1714493938] [2020-08-21 14:14:22,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:22,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:22,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:22,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:22,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:22,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:23,733 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:23,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1714493938] [2020-08-21 14:14:23,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:23,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 14:14:23,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126803290] [2020-08-21 14:14:23,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 14:14:23,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:23,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 14:14:23,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 14:14:23,736 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 14:14:24,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:24,182 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 14:14:24,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 14:14:24,183 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 14:14:24,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:24,184 INFO L225 Difference]: With dead ends: 110 [2020-08-21 14:14:24,184 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 14:14:24,186 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 14:14:24,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 14:14:24,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 14:14:24,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 14:14:24,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 14:14:24,191 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 14:14:24,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:24,191 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 14:14:24,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 14:14:24,191 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 14:14:24,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 14:14:24,192 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:24,192 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:24,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 14:14:24,193 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:24,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:24,193 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-21 14:14:24,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:24,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349067167] [2020-08-21 14:14:24,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:24,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:24,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:24,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:24,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:24,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:25,836 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:25,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349067167] [2020-08-21 14:14:25,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:25,836 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 14:14:25,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940503369] [2020-08-21 14:14:25,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 14:14:25,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:25,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 14:14:25,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 14:14:25,840 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 14:14:26,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:26,302 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 14:14:26,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 14:14:26,303 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 14:14:26,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:26,304 INFO L225 Difference]: With dead ends: 112 [2020-08-21 14:14:26,304 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 14:14:26,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 14:14:26,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 14:14:26,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 14:14:26,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 14:14:26,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 14:14:26,311 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 14:14:26,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:26,311 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 14:14:26,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 14:14:26,311 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 14:14:26,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 14:14:26,312 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:26,312 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:26,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 14:14:26,312 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:26,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:26,313 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-21 14:14:26,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:26,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858767544] [2020-08-21 14:14:26,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:26,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:26,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:26,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:26,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:26,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,067 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:28,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858767544] [2020-08-21 14:14:28,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:28,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 14:14:28,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853343647] [2020-08-21 14:14:28,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 14:14:28,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:28,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 14:14:28,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 14:14:28,068 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 14:14:28,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:28,495 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 14:14:28,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 14:14:28,495 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 14:14:28,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:28,497 INFO L225 Difference]: With dead ends: 114 [2020-08-21 14:14:28,497 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 14:14:28,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 14:14:28,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 14:14:28,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 14:14:28,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 14:14:28,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 14:14:28,502 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 14:14:28,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:28,503 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 14:14:28,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 14:14:28,503 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 14:14:28,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 14:14:28,503 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:28,504 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:28,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 14:14:28,504 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:28,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:28,504 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-21 14:14:28,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:28,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808005873] [2020-08-21 14:14:28,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:28,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:28,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:28,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:30,360 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:30,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1808005873] [2020-08-21 14:14:30,361 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:30,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 14:14:30,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798266623] [2020-08-21 14:14:30,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 14:14:30,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:30,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 14:14:30,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 14:14:30,363 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 14:14:30,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:30,727 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 14:14:30,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 14:14:30,728 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 14:14:30,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:30,729 INFO L225 Difference]: With dead ends: 116 [2020-08-21 14:14:30,729 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 14:14:30,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 14:14:30,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 14:14:30,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 14:14:30,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 14:14:30,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 14:14:30,735 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 14:14:30,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:30,735 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 14:14:30,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 14:14:30,736 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 14:14:30,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 14:14:30,736 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:30,736 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:30,737 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 14:14:30,737 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:30,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:30,737 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-21 14:14:30,737 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:30,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [509189627] [2020-08-21 14:14:30,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:30,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:30,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:30,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:30,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:30,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:32,621 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:32,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [509189627] [2020-08-21 14:14:32,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:32,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 14:14:32,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128389837] [2020-08-21 14:14:32,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 14:14:32,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:32,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 14:14:32,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 14:14:32,623 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 14:14:33,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:33,134 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 14:14:33,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 14:14:33,135 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 14:14:33,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:33,136 INFO L225 Difference]: With dead ends: 118 [2020-08-21 14:14:33,137 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 14:14:33,137 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 14:14:33,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 14:14:33,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 14:14:33,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 14:14:33,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 14:14:33,143 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 14:14:33,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:33,143 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 14:14:33,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 14:14:33,143 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 14:14:33,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 14:14:33,144 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:33,144 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:33,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 14:14:33,145 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:33,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:33,145 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-21 14:14:33,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:33,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473859875] [2020-08-21 14:14:33,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:33,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:33,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:33,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:33,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:33,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:35,151 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:35,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473859875] [2020-08-21 14:14:35,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:35,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 14:14:35,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497207299] [2020-08-21 14:14:35,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 14:14:35,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:35,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 14:14:35,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 14:14:35,153 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 14:14:35,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:35,591 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 14:14:35,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 14:14:35,592 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 14:14:35,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:35,593 INFO L225 Difference]: With dead ends: 120 [2020-08-21 14:14:35,593 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 14:14:35,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 14:14:35,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 14:14:35,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 14:14:35,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 14:14:35,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 14:14:35,600 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 14:14:35,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:35,600 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 14:14:35,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 14:14:35,600 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 14:14:35,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 14:14:35,601 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:35,601 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:35,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 14:14:35,601 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:35,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:35,602 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-21 14:14:35,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:35,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [459714193] [2020-08-21 14:14:35,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:35,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:35,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:35,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:35,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:35,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:37,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:37,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [459714193] [2020-08-21 14:14:37,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:37,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 14:14:37,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864227331] [2020-08-21 14:14:37,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 14:14:37,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:37,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 14:14:37,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 14:14:37,784 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 14:14:38,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:38,126 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 14:14:38,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 14:14:38,126 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 14:14:38,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:38,127 INFO L225 Difference]: With dead ends: 122 [2020-08-21 14:14:38,128 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 14:14:38,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 14:14:38,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 14:14:38,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 14:14:38,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 14:14:38,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 14:14:38,132 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 14:14:38,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:38,133 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 14:14:38,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 14:14:38,133 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 14:14:38,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 14:14:38,133 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:38,134 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:38,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 14:14:38,134 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:38,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:38,134 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-21 14:14:38,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:38,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055119879] [2020-08-21 14:14:38,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:38,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:38,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:38,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:38,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:38,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:40,331 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:40,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055119879] [2020-08-21 14:14:40,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:40,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 14:14:40,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134586290] [2020-08-21 14:14:40,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 14:14:40,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:40,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 14:14:40,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 14:14:40,333 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 14:14:40,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:40,652 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 14:14:40,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 14:14:40,653 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 14:14:40,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:40,654 INFO L225 Difference]: With dead ends: 124 [2020-08-21 14:14:40,655 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 14:14:40,656 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 14:14:40,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 14:14:40,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 14:14:40,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 14:14:40,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 14:14:40,661 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 14:14:40,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:40,661 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 14:14:40,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 14:14:40,662 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 14:14:40,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 14:14:40,662 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:40,662 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:40,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 14:14:40,663 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:40,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:40,663 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-21 14:14:40,663 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:40,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098859553] [2020-08-21 14:14:40,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:40,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:40,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:40,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:40,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:40,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:42,935 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:42,936 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098859553] [2020-08-21 14:14:42,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:42,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 14:14:42,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433338642] [2020-08-21 14:14:42,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 14:14:42,937 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:42,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 14:14:42,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 14:14:42,938 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 14:14:43,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:43,291 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 14:14:43,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 14:14:43,292 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 14:14:43,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:43,293 INFO L225 Difference]: With dead ends: 126 [2020-08-21 14:14:43,293 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 14:14:43,295 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 14:14:43,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 14:14:43,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 14:14:43,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 14:14:43,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 14:14:43,300 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 14:14:43,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:43,300 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 14:14:43,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 14:14:43,300 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 14:14:43,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 14:14:43,301 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:43,301 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:43,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 14:14:43,301 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:43,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:43,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-21 14:14:43,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:43,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575388910] [2020-08-21 14:14:43,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:43,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:43,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:43,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:43,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:43,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:45,783 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:45,784 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [575388910] [2020-08-21 14:14:45,784 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:45,784 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 14:14:45,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305995772] [2020-08-21 14:14:45,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 14:14:45,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:45,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 14:14:45,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 14:14:45,785 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 14:14:46,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:46,213 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 14:14:46,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 14:14:46,213 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 14:14:46,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:46,214 INFO L225 Difference]: With dead ends: 128 [2020-08-21 14:14:46,215 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 14:14:46,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 14:14:46,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 14:14:46,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 14:14:46,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 14:14:46,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 14:14:46,227 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 14:14:46,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:46,227 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 14:14:46,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 14:14:46,228 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 14:14:46,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 14:14:46,229 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:46,229 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:46,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 14:14:46,229 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:46,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:46,230 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-21 14:14:46,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:46,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [907216236] [2020-08-21 14:14:46,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:46,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:46,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:46,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:46,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:46,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:48,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 14:14:48,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [907216236] [2020-08-21 14:14:48,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:48,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 14:14:48,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1829185753] [2020-08-21 14:14:48,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 14:14:48,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:48,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 14:14:48,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 14:14:48,778 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 14:14:49,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:49,378 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 14:14:49,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 14:14:49,378 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 14:14:49,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:49,380 INFO L225 Difference]: With dead ends: 130 [2020-08-21 14:14:49,380 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 14:14:49,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 14:14:49,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 14:14:49,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 14:14:49,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 14:14:49,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 14:14:49,387 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 14:14:49,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:49,387 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 14:14:49,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 14:14:49,387 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 14:14:49,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 14:14:49,388 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:49,388 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:49,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 14:14:49,388 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:49,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:49,389 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-21 14:14:49,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:49,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128312831] [2020-08-21 14:14:49,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:49,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:49,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:14:49,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat