/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 19:03:36,040 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 19:03:36,066 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:03:36,067 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:03:36,068 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:03:36,070 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:03:36,072 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:03:36,073 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:03:36,073 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:03:36,075 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:03:36,075 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:03:36,076 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:03:36,077 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:03:36,078 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:03:36,079 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:03:36,080 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:03:36,081 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:03:36,083 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:03:36,085 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:03:36,086 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:03:36,087 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:03:36,088 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:03:36,090 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 19:03:36,098 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:03:36,099 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:03:36,099 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:03:36,100 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 19:03:36,121 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:03:36,121 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:03:36,123 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:03:36,123 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:03:36,123 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:03:36,123 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:03:36,124 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:03:36,124 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:03:36,124 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:03:36,124 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:03:36,124 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:03:36,125 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:03:36,125 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:03:36,125 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:03:36,125 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:03:36,125 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:03:36,126 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:03:36,126 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:03:36,126 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:03:36,126 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:03:36,126 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:03:36,127 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:03:36,127 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:03:36,127 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:03:36,127 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:03:36,127 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:03:36,128 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:03:36,128 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:03:36,128 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:03:36,128 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 19:03:36,464 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:03:36,478 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:03:36,481 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:03:36,483 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:03:36,484 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:03:36,484 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 19:03:36,565 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cccc10aa2/6d468d28acac4adb9bfee4362c679aa6/FLAGb887d2342 [2020-08-21 19:03:37,023 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:03:37,024 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 19:03:37,030 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cccc10aa2/6d468d28acac4adb9bfee4362c679aa6/FLAGb887d2342 [2020-08-21 19:03:37,390 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cccc10aa2/6d468d28acac4adb9bfee4362c679aa6 [2020-08-21 19:03:37,399 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:03:37,400 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:03:37,401 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:03:37,402 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:03:37,405 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:03:37,407 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:03:37" (1/1) ... [2020-08-21 19:03:37,410 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@dbf213c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:03:37, skipping insertion in model container [2020-08-21 19:03:37,410 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:03:37" (1/1) ... [2020-08-21 19:03:37,419 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:03:37,437 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:03:37,632 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:03:37,639 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:03:37,659 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:03:37,676 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:03:37,677 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:03:37 WrapperNode [2020-08-21 19:03:37,677 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:03:37,678 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:03:37,678 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:03:37,678 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:03:37,778 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:03:37" (1/1) ... [2020-08-21 19:03:37,778 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:03:37" (1/1) ... [2020-08-21 19:03:37,789 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:03:37" (1/1) ... [2020-08-21 19:03:37,790 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:03:37" (1/1) ... [2020-08-21 19:03:37,815 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:03:37" (1/1) ... [2020-08-21 19:03:37,823 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:03:37" (1/1) ... [2020-08-21 19:03:37,828 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:03:37" (1/1) ... [2020-08-21 19:03:37,830 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:03:37,831 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:03:37,831 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:03:37,831 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:03:37,832 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:03:37" (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 19:03:37,890 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:03:37,890 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:03:37,890 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 19:03:37,890 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 19:03:37,890 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:03:37,891 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 19:03:37,891 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:03:37,891 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:03:37,891 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 19:03:37,891 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 19:03:37,891 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 19:03:37,892 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:03:37,892 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 19:03:37,892 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 19:03:37,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 19:03:37,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:03:37,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:03:38,247 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:03:38,248 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 19:03:38,251 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:03:38 BoogieIcfgContainer [2020-08-21 19:03:38,251 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:03:38,252 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:03:38,252 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:03:38,255 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:03:38,256 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:03:37" (1/3) ... [2020-08-21 19:03:38,257 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@748787c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:03:38, skipping insertion in model container [2020-08-21 19:03:38,257 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:03:37" (2/3) ... [2020-08-21 19:03:38,257 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@748787c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:03:38, skipping insertion in model container [2020-08-21 19:03:38,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:03:38" (3/3) ... [2020-08-21 19:03:38,259 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-21 19:03:38,270 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:03:38,277 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:03:38,290 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:03:38,314 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:03:38,314 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:03:38,314 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:03:38,314 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:03:38,315 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:03:38,315 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:03:38,315 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:03:38,315 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:03:38,334 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 19:03:38,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 19:03:38,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:38,339 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 19:03:38,340 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:38,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:38,345 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-21 19:03:38,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:38,354 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1545529954] [2020-08-21 19:03:38,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:38,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:38,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:38,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:38,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:38,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:38,603 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 19:03:38,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1545529954] [2020-08-21 19:03:38,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:03:38,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 19:03:38,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917916467] [2020-08-21 19:03:38,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:03:38,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:38,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:03:38,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:03:38,627 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 19:03:38,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:38,768 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 19:03:38,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 19:03:38,770 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 19:03:38,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:38,780 INFO L225 Difference]: With dead ends: 59 [2020-08-21 19:03:38,780 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 19:03:38,784 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:03:38,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 19:03:38,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 19:03:38,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 19:03:38,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 19:03:38,827 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 19:03:38,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:38,828 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 19:03:38,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:03:38,829 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 19:03:38,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 19:03:38,830 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:38,830 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 19:03:38,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:03:38,831 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:38,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:38,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-21 19:03:38,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:38,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290659088] [2020-08-21 19:03:38,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:38,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:38,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:38,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:38,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:38,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:39,010 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 19:03:39,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290659088] [2020-08-21 19:03:39,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:03:39,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 19:03:39,012 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130012674] [2020-08-21 19:03:39,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:03:39,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:39,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:03:39,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:03:39,015 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 19:03:39,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:39,232 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 19:03:39,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:03:39,232 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 19:03:39,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:39,234 INFO L225 Difference]: With dead ends: 48 [2020-08-21 19:03:39,234 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 19:03:39,236 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 19:03:39,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 19:03:39,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 19:03:39,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 19:03:39,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 19:03:39,245 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 19:03:39,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:39,246 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 19:03:39,246 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:03:39,246 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 19:03:39,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 19:03:39,248 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:39,248 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 19:03:39,248 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:03:39,249 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:39,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:39,249 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-21 19:03:39,249 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:39,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [976668877] [2020-08-21 19:03:39,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:39,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:39,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:39,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:39,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:39,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:39,519 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 19:03:39,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [976668877] [2020-08-21 19:03:39,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:39,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:03:39,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943048226] [2020-08-21 19:03:39,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:03:39,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:39,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:03:39,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:03:39,523 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 19:03:39,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:39,733 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 19:03:39,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:03:39,734 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 19:03:39,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:39,735 INFO L225 Difference]: With dead ends: 50 [2020-08-21 19:03:39,735 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 19:03:39,736 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 19:03:39,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 19:03:39,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 19:03:39,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 19:03:39,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 19:03:39,749 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 19:03:39,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:39,749 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 19:03:39,749 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:03:39,750 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 19:03:39,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 19:03:39,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:39,751 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 19:03:39,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:03:39,752 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:39,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:39,752 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-21 19:03:39,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:39,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2108785591] [2020-08-21 19:03:39,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:39,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:39,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:39,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:39,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:39,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:39,971 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 19:03:39,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2108785591] [2020-08-21 19:03:39,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:39,972 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:03:39,972 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850315538] [2020-08-21 19:03:39,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:03:39,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:39,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:03:39,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:03:39,974 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 19:03:40,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:40,181 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 19:03:40,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:03:40,182 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 19:03:40,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:40,183 INFO L225 Difference]: With dead ends: 52 [2020-08-21 19:03:40,183 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 19:03:40,184 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 19:03:40,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 19:03:40,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 19:03:40,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 19:03:40,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 19:03:40,191 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 19:03:40,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:40,191 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 19:03:40,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:03:40,192 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 19:03:40,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 19:03:40,192 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:40,193 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 19:03:40,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:03:40,193 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:40,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:40,194 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-21 19:03:40,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:40,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300468236] [2020-08-21 19:03:40,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:40,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:40,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:40,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:40,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:40,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:40,426 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 19:03:40,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300468236] [2020-08-21 19:03:40,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:40,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:03:40,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236862615] [2020-08-21 19:03:40,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:03:40,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:40,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:03:40,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:03:40,430 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 19:03:40,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:40,654 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 19:03:40,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:03:40,654 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 19:03:40,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:40,655 INFO L225 Difference]: With dead ends: 54 [2020-08-21 19:03:40,655 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 19:03:40,656 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 19:03:40,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 19:03:40,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 19:03:40,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 19:03:40,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 19:03:40,663 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 19:03:40,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:40,663 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 19:03:40,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:03:40,663 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 19:03:40,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 19:03:40,664 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:40,664 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 19:03:40,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:03:40,665 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:40,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:40,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-21 19:03:40,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:40,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1780294555] [2020-08-21 19:03:40,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:40,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:40,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:40,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:40,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:40,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:40,913 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 19:03:40,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1780294555] [2020-08-21 19:03:40,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:40,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 19:03:40,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733630829] [2020-08-21 19:03:40,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 19:03:40,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:40,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 19:03:40,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:03:40,916 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 19:03:41,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:41,095 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 19:03:41,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 19:03:41,096 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 19:03:41,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:41,097 INFO L225 Difference]: With dead ends: 56 [2020-08-21 19:03:41,097 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 19:03:41,098 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 19:03:41,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 19:03:41,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 19:03:41,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 19:03:41,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 19:03:41,104 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 19:03:41,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:41,105 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 19:03:41,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 19:03:41,105 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 19:03:41,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 19:03:41,106 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:41,106 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 19:03:41,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:03:41,107 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:41,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:41,107 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-21 19:03:41,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:41,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [862925006] [2020-08-21 19:03:41,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:41,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:41,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:41,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:41,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:41,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:41,397 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 19:03:41,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [862925006] [2020-08-21 19:03:41,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:41,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:03:41,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882806398] [2020-08-21 19:03:41,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:03:41,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:41,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:03:41,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:03:41,402 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 19:03:41,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:41,624 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 19:03:41,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 19:03:41,625 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 19:03:41,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:41,626 INFO L225 Difference]: With dead ends: 58 [2020-08-21 19:03:41,627 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 19:03:41,628 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 19:03:41,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 19:03:41,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 19:03:41,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 19:03:41,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 19:03:41,633 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 19:03:41,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:41,634 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 19:03:41,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:03:41,634 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 19:03:41,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 19:03:41,635 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:41,635 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 19:03:41,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:03:41,636 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:41,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:41,636 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-21 19:03:41,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:41,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [508847275] [2020-08-21 19:03:41,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:41,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:41,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:41,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:41,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:41,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:41,944 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 19:03:41,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [508847275] [2020-08-21 19:03:41,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:41,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 19:03:41,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191569158] [2020-08-21 19:03:41,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 19:03:41,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:41,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 19:03:41,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:03:41,946 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 19:03:42,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:42,169 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 19:03:42,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 19:03:42,170 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 19:03:42,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:42,171 INFO L225 Difference]: With dead ends: 60 [2020-08-21 19:03:42,171 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 19:03:42,174 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 19:03:42,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 19:03:42,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 19:03:42,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 19:03:42,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 19:03:42,182 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 19:03:42,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:42,183 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 19:03:42,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 19:03:42,186 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 19:03:42,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 19:03:42,187 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:42,187 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 19:03:42,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 19:03:42,187 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:42,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:42,191 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-21 19:03:42,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:42,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1767786773] [2020-08-21 19:03:42,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:42,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:42,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:42,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:42,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:42,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:42,561 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 19:03:42,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1767786773] [2020-08-21 19:03:42,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:42,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 19:03:42,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170145078] [2020-08-21 19:03:42,563 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 19:03:42,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:42,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 19:03:42,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:03:42,564 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 19:03:42,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:42,754 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 19:03:42,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 19:03:42,755 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 19:03:42,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:42,756 INFO L225 Difference]: With dead ends: 62 [2020-08-21 19:03:42,756 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 19:03:42,756 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 19:03:42,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 19:03:42,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 19:03:42,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 19:03:42,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 19:03:42,762 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 19:03:42,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:42,763 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 19:03:42,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 19:03:42,763 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 19:03:42,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 19:03:42,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:42,764 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 19:03:42,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 19:03:42,764 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:42,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:42,765 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-21 19:03:42,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:42,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422230242] [2020-08-21 19:03:42,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:42,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:42,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:42,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:42,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:42,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:43,152 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 19:03:43,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422230242] [2020-08-21 19:03:43,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:43,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 19:03:43,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103329765] [2020-08-21 19:03:43,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 19:03:43,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:43,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 19:03:43,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:03:43,155 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 19:03:43,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:43,389 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 19:03:43,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 19:03:43,389 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 19:03:43,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:43,390 INFO L225 Difference]: With dead ends: 64 [2020-08-21 19:03:43,390 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 19:03:43,391 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 19:03:43,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 19:03:43,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 19:03:43,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 19:03:43,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 19:03:43,397 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 19:03:43,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:43,397 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 19:03:43,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 19:03:43,398 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 19:03:43,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 19:03:43,398 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:43,399 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 19:03:43,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 19:03:43,399 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:43,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:43,399 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-21 19:03:43,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:43,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1492748533] [2020-08-21 19:03:43,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:43,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:43,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:43,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:43,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:43,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:43,457 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 19:03:43,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1492748533] [2020-08-21 19:03:43,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:03:43,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 19:03:43,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143692110] [2020-08-21 19:03:43,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:03:43,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:43,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:03:43,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:03:43,460 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 19:03:43,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:43,546 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 19:03:43,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:03:43,547 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 19:03:43,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:43,549 INFO L225 Difference]: With dead ends: 65 [2020-08-21 19:03:43,549 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 19:03:43,550 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 19:03:43,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 19:03:43,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 19:03:43,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 19:03:43,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 19:03:43,560 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 19:03:43,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:43,561 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 19:03:43,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:03:43,561 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 19:03:43,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 19:03:43,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:43,562 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 19:03:43,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 19:03:43,562 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:43,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:43,563 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-21 19:03:43,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:43,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126403153] [2020-08-21 19:03:43,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:43,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:43,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:43,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:43,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:43,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:43,668 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 19:03:43,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126403153] [2020-08-21 19:03:43,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:43,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:03:43,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466115922] [2020-08-21 19:03:43,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:03:43,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:43,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:03:43,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:03:43,672 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 19:03:43,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:43,803 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 19:03:43,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:03:43,804 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 19:03:43,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:43,805 INFO L225 Difference]: With dead ends: 73 [2020-08-21 19:03:43,805 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 19:03:43,806 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 19:03:43,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 19:03:43,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 19:03:43,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 19:03:43,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 19:03:43,816 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 19:03:43,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:43,817 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 19:03:43,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:03:43,817 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 19:03:43,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 19:03:43,821 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:43,821 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 19:03:43,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 19:03:43,822 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:43,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:43,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-21 19:03:43,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:43,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [857362831] [2020-08-21 19:03:43,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:43,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:43,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:43,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:43,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:43,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:43,896 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 19:03:43,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [857362831] [2020-08-21 19:03:43,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:03:43,897 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 19:03:43,897 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364025244] [2020-08-21 19:03:43,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:03:43,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:43,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:03:43,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:03:43,900 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 19:03:43,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:43,967 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 19:03:43,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:03:43,967 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 19:03:43,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:43,969 INFO L225 Difference]: With dead ends: 69 [2020-08-21 19:03:43,969 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 19:03:43,969 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 19:03:43,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 19:03:43,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 19:03:43,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 19:03:43,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 19:03:43,983 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 19:03:43,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:43,983 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 19:03:43,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:03:43,983 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 19:03:43,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 19:03:43,984 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:43,984 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 19:03:43,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 19:03:43,984 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:43,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:43,985 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-21 19:03:43,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:43,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1268830471] [2020-08-21 19:03:43,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:44,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:44,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:44,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:44,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:44,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:44,454 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 19:03:44,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1268830471] [2020-08-21 19:03:44,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:44,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 19:03:44,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978778140] [2020-08-21 19:03:44,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 19:03:44,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:44,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 19:03:44,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:03:44,456 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 19:03:44,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:44,680 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 19:03:44,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 19:03:44,680 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 19:03:44,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:44,682 INFO L225 Difference]: With dead ends: 74 [2020-08-21 19:03:44,682 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 19:03:44,683 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 19:03:44,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 19:03:44,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 19:03:44,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 19:03:44,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 19:03:44,690 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 19:03:44,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:44,690 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 19:03:44,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 19:03:44,691 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 19:03:44,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 19:03:44,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:44,692 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 19:03:44,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 19:03:44,692 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:44,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:44,692 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-21 19:03:44,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:44,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1173424896] [2020-08-21 19:03:44,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:44,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:44,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:44,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:44,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:44,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:45,222 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 19:03:45,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1173424896] [2020-08-21 19:03:45,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:45,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 19:03:45,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104612358] [2020-08-21 19:03:45,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 19:03:45,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:45,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 19:03:45,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:03:45,225 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 19:03:45,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:45,467 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 19:03:45,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 19:03:45,467 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 19:03:45,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:45,468 INFO L225 Difference]: With dead ends: 76 [2020-08-21 19:03:45,468 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 19:03:45,469 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 19:03:45,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 19:03:45,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 19:03:45,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 19:03:45,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 19:03:45,475 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 19:03:45,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:45,475 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 19:03:45,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 19:03:45,475 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 19:03:45,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 19:03:45,476 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:45,476 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 19:03:45,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 19:03:45,477 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:45,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:45,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-21 19:03:45,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:45,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [376942167] [2020-08-21 19:03:45,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:45,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:45,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:45,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:45,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:45,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:46,122 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 19:03:46,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [376942167] [2020-08-21 19:03:46,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:46,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 19:03:46,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814591304] [2020-08-21 19:03:46,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 19:03:46,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:46,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 19:03:46,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 19:03:46,125 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 19:03:46,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:46,380 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 19:03:46,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 19:03:46,380 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 19:03:46,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:46,381 INFO L225 Difference]: With dead ends: 78 [2020-08-21 19:03:46,381 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 19:03:46,382 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-21 19:03:46,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 19:03:46,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 19:03:46,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 19:03:46,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 19:03:46,388 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 19:03:46,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:46,389 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 19:03:46,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 19:03:46,389 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 19:03:46,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 19:03:46,390 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:46,390 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 19:03:46,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 19:03:46,390 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:46,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:46,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-21 19:03:46,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:46,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [14059437] [2020-08-21 19:03:46,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:46,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:46,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:46,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:46,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:46,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:47,068 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 19:03:47,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [14059437] [2020-08-21 19:03:47,069 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:47,069 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 19:03:47,069 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557900086] [2020-08-21 19:03:47,070 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 19:03:47,070 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:47,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 19:03:47,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 19:03:47,071 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 19:03:47,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:47,320 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 19:03:47,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 19:03:47,321 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 19:03:47,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:47,322 INFO L225 Difference]: With dead ends: 80 [2020-08-21 19:03:47,322 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 19:03:47,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:03:47,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 19:03:47,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 19:03:47,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 19:03:47,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 19:03:47,327 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 19:03:47,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:47,327 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 19:03:47,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 19:03:47,328 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 19:03:47,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 19:03:47,328 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:47,328 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 19:03:47,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 19:03:47,329 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:47,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:47,329 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-21 19:03:47,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:47,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [569107173] [2020-08-21 19:03:47,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:47,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:47,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:47,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:47,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:47,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:47,934 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 19:03:47,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [569107173] [2020-08-21 19:03:47,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:47,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 19:03:47,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041853161] [2020-08-21 19:03:47,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 19:03:47,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:47,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 19:03:47,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 19:03:47,936 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 19:03:48,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:48,222 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 19:03:48,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 19:03:48,222 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 19:03:48,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:48,223 INFO L225 Difference]: With dead ends: 82 [2020-08-21 19:03:48,223 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 19:03:48,224 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 19:03:48,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 19:03:48,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 19:03:48,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 19:03:48,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 19:03:48,231 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 19:03:48,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:48,232 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 19:03:48,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 19:03:48,232 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 19:03:48,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 19:03:48,233 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:48,233 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 19:03:48,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 19:03:48,234 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:48,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:48,234 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-21 19:03:48,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:48,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113080881] [2020-08-21 19:03:48,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:48,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:48,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:48,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:48,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:48,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:49,105 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 19:03:49,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113080881] [2020-08-21 19:03:49,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:49,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 19:03:49,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18598241] [2020-08-21 19:03:49,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 19:03:49,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:49,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 19:03:49,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 19:03:49,110 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 19:03:49,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:49,464 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 19:03:49,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 19:03:49,464 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 19:03:49,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:49,465 INFO L225 Difference]: With dead ends: 84 [2020-08-21 19:03:49,466 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 19:03:49,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:03:49,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 19:03:49,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 19:03:49,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 19:03:49,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 19:03:49,472 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 19:03:49,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:49,473 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 19:03:49,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 19:03:49,473 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 19:03:49,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 19:03:49,474 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:49,475 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 19:03:49,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 19:03:49,475 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:49,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:49,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-21 19:03:49,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:49,476 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1919874230] [2020-08-21 19:03:49,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:49,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:49,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:49,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:49,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:49,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:50,257 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 19:03:50,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1919874230] [2020-08-21 19:03:50,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:50,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 19:03:50,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768740183] [2020-08-21 19:03:50,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 19:03:50,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:50,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 19:03:50,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 19:03:50,259 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 19:03:50,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:50,497 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 19:03:50,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 19:03:50,497 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 19:03:50,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:50,498 INFO L225 Difference]: With dead ends: 86 [2020-08-21 19:03:50,498 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 19:03:50,499 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 19:03:50,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 19:03:50,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 19:03:50,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 19:03:50,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 19:03:50,504 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 19:03:50,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:50,504 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 19:03:50,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 19:03:50,505 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 19:03:50,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 19:03:50,505 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:50,505 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 19:03:50,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 19:03:50,506 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:50,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:50,506 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-21 19:03:50,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:50,507 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114622737] [2020-08-21 19:03:50,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:50,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:50,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:50,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:50,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:50,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:51,330 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 19:03:51,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114622737] [2020-08-21 19:03:51,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:51,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 19:03:51,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524343953] [2020-08-21 19:03:51,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 19:03:51,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:51,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 19:03:51,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 19:03:51,332 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 19:03:51,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:51,658 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 19:03:51,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 19:03:51,658 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 19:03:51,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:51,659 INFO L225 Difference]: With dead ends: 88 [2020-08-21 19:03:51,660 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 19:03:51,661 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 19:03:51,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 19:03:51,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 19:03:51,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 19:03:51,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 19:03:51,666 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 19:03:51,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:51,666 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 19:03:51,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 19:03:51,666 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 19:03:51,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 19:03:51,667 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:51,667 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 19:03:51,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 19:03:51,668 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:51,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:51,668 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-21 19:03:51,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:51,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022882438] [2020-08-21 19:03:51,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:51,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:51,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:51,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:51,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:51,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:52,488 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 19:03:52,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022882438] [2020-08-21 19:03:52,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:52,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 19:03:52,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526084947] [2020-08-21 19:03:52,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 19:03:52,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:52,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 19:03:52,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 19:03:52,491 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 19:03:52,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:52,798 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 19:03:52,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 19:03:52,800 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 19:03:52,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:52,801 INFO L225 Difference]: With dead ends: 90 [2020-08-21 19:03:52,801 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 19:03:52,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-21 19:03:52,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 19:03:52,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 19:03:52,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 19:03:52,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 19:03:52,806 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 19:03:52,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:52,807 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 19:03:52,807 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 19:03:52,807 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 19:03:52,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 19:03:52,808 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:52,808 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 19:03:52,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 19:03:52,808 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:52,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:52,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-21 19:03:52,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:52,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [720824682] [2020-08-21 19:03:52,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:52,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:52,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:52,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:52,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:52,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:53,776 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 19:03:53,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [720824682] [2020-08-21 19:03:53,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:53,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 19:03:53,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343926435] [2020-08-21 19:03:53,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 19:03:53,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:53,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 19:03:53,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:03:53,779 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 19:03:54,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:54,052 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 19:03:54,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 19:03:54,053 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 19:03:54,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:54,054 INFO L225 Difference]: With dead ends: 92 [2020-08-21 19:03:54,054 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 19:03:54,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-21 19:03:54,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 19:03:54,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 19:03:54,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 19:03:54,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 19:03:54,060 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 19:03:54,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:54,060 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 19:03:54,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 19:03:54,060 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 19:03:54,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 19:03:54,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:54,061 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 19:03:54,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 19:03:54,062 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:54,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:54,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-21 19:03:54,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:54,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055173476] [2020-08-21 19:03:54,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:54,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:54,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:54,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:54,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:54,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:54,988 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 19:03:54,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055173476] [2020-08-21 19:03:54,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:54,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 19:03:54,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914027207] [2020-08-21 19:03:54,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 19:03:54,989 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:54,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 19:03:54,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 19:03:54,990 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 19:03:55,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:55,339 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 19:03:55,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 19:03:55,339 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 19:03:55,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:55,340 INFO L225 Difference]: With dead ends: 94 [2020-08-21 19:03:55,340 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 19:03:55,341 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-21 19:03:55,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 19:03:55,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 19:03:55,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 19:03:55,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 19:03:55,346 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 19:03:55,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:55,347 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 19:03:55,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 19:03:55,347 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 19:03:55,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 19:03:55,347 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:55,348 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 19:03:55,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 19:03:55,348 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:55,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:55,348 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-21 19:03:55,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:55,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775674703] [2020-08-21 19:03:55,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:55,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:55,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:55,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:55,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:55,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:56,365 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 19:03:56,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775674703] [2020-08-21 19:03:56,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:56,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 19:03:56,366 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832068287] [2020-08-21 19:03:56,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 19:03:56,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:56,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 19:03:56,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 19:03:56,368 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 19:03:56,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:56,729 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 19:03:56,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 19:03:56,729 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 19:03:56,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:56,730 INFO L225 Difference]: With dead ends: 96 [2020-08-21 19:03:56,730 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 19:03:56,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-21 19:03:56,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 19:03:56,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 19:03:56,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 19:03:56,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 19:03:56,738 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 19:03:56,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:56,738 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 19:03:56,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 19:03:56,738 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 19:03:56,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 19:03:56,739 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:56,739 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 19:03:56,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 19:03:56,740 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:56,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:56,740 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-21 19:03:56,741 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:56,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31067458] [2020-08-21 19:03:56,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:56,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:56,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:56,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:56,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:56,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:57,818 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 19:03:57,818 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31067458] [2020-08-21 19:03:57,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:57,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 19:03:57,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531195100] [2020-08-21 19:03:57,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 19:03:57,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:57,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 19:03:57,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 19:03:57,820 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 19:03:58,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:58,053 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 19:03:58,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 19:03:58,054 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 19:03:58,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:58,055 INFO L225 Difference]: With dead ends: 98 [2020-08-21 19:03:58,055 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 19:03:58,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-21 19:03:58,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 19:03:58,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 19:03:58,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 19:03:58,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 19:03:58,062 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 19:03:58,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:58,062 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 19:03:58,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 19:03:58,063 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 19:03:58,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 19:03:58,064 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:58,064 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 19:03:58,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 19:03:58,065 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:58,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:58,065 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-21 19:03:58,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:58,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [468292993] [2020-08-21 19:03:58,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:58,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:58,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:58,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:58,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:58,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:59,251 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 19:03:59,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [468292993] [2020-08-21 19:03:59,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:03:59,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 19:03:59,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489923653] [2020-08-21 19:03:59,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 19:03:59,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:03:59,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 19:03:59,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 19:03:59,253 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 19:03:59,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:03:59,591 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 19:03:59,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 19:03:59,591 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 19:03:59,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:03:59,592 INFO L225 Difference]: With dead ends: 100 [2020-08-21 19:03:59,592 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 19:03:59,593 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 19:03:59,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 19:03:59,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 19:03:59,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 19:03:59,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 19:03:59,600 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 19:03:59,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:03:59,601 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 19:03:59,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 19:03:59,601 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 19:03:59,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 19:03:59,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:03:59,602 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 19:03:59,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 19:03:59,602 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:03:59,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:03:59,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-21 19:03:59,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:03:59,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857748413] [2020-08-21 19:03:59,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:03:59,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:59,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:03:59,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:03:59,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:03:59,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:00,829 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 19:04:00,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857748413] [2020-08-21 19:04:00,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:00,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 19:04:00,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232594475] [2020-08-21 19:04:00,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 19:04:00,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:00,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 19:04:00,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 19:04:00,832 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 19:04:01,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:01,237 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 19:04:01,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 19:04:01,237 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 19:04:01,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:01,239 INFO L225 Difference]: With dead ends: 102 [2020-08-21 19:04:01,239 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 19:04:01,240 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 19:04:01,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 19:04:01,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 19:04:01,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 19:04:01,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 19:04:01,246 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 19:04:01,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:01,246 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 19:04:01,246 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 19:04:01,246 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 19:04:01,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 19:04:01,247 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:01,247 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 19:04:01,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 19:04:01,247 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:01,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:01,247 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-21 19:04:01,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:01,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [588488204] [2020-08-21 19:04:01,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:01,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:01,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:01,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:01,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:01,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:02,585 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 19:04:02,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [588488204] [2020-08-21 19:04:02,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:02,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 19:04:02,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978419559] [2020-08-21 19:04:02,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 19:04:02,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:02,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 19:04:02,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 19:04:02,589 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 19:04:02,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:02,893 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 19:04:02,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 19:04:02,894 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 19:04:02,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:02,895 INFO L225 Difference]: With dead ends: 104 [2020-08-21 19:04:02,895 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 19:04:02,896 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 19:04:02,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 19:04:02,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 19:04:02,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 19:04:02,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 19:04:02,903 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 19:04:02,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:02,903 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 19:04:02,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 19:04:02,903 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 19:04:02,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 19:04:02,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:02,904 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 19:04:02,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 19:04:02,905 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:02,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:02,905 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-21 19:04:02,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:02,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1454210746] [2020-08-21 19:04:02,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:02,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:02,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:02,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:02,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:03,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:04,289 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 19:04:04,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1454210746] [2020-08-21 19:04:04,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:04,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 19:04:04,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702348482] [2020-08-21 19:04:04,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 19:04:04,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:04,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 19:04:04,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 19:04:04,294 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 19:04:04,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:04,711 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 19:04:04,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 19:04:04,711 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 19:04:04,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:04,712 INFO L225 Difference]: With dead ends: 106 [2020-08-21 19:04:04,712 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 19:04:04,714 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 19:04:04,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 19:04:04,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 19:04:04,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 19:04:04,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 19:04:04,719 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 19:04:04,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:04,719 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 19:04:04,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 19:04:04,719 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 19:04:04,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 19:04:04,720 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:04,720 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 19:04:04,720 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 19:04:04,720 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:04,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:04,721 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-21 19:04:04,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:04,721 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [168012148] [2020-08-21 19:04:04,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:04,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:04,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:04,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:04,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:04,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:06,174 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 19:04:06,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [168012148] [2020-08-21 19:04:06,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:06,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 19:04:06,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493286817] [2020-08-21 19:04:06,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 19:04:06,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:06,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 19:04:06,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 19:04:06,176 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 19:04:06,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:06,620 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 19:04:06,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 19:04:06,620 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 19:04:06,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:06,622 INFO L225 Difference]: With dead ends: 108 [2020-08-21 19:04:06,622 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 19:04:06,623 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 19:04:06,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 19:04:06,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 19:04:06,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 19:04:06,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 19:04:06,626 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 19:04:06,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:06,626 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 19:04:06,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 19:04:06,627 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 19:04:06,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 19:04:06,627 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:06,628 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 19:04:06,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 19:04:06,628 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:06,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:06,628 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-21 19:04:06,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:06,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1793775607] [2020-08-21 19:04:06,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:06,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:06,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:06,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:06,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:06,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:08,149 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 19:04:08,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1793775607] [2020-08-21 19:04:08,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:08,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 19:04:08,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399529793] [2020-08-21 19:04:08,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 19:04:08,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:08,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 19:04:08,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 19:04:08,151 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 19:04:08,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:08,571 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 19:04:08,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 19:04:08,571 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 19:04:08,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:08,573 INFO L225 Difference]: With dead ends: 110 [2020-08-21 19:04:08,573 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 19:04:08,574 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 19:04:08,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 19:04:08,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 19:04:08,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 19:04:08,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 19:04:08,579 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 19:04:08,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:08,580 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 19:04:08,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 19:04:08,580 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 19:04:08,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 19:04:08,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:08,581 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 19:04:08,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 19:04:08,581 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:08,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:08,581 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-21 19:04:08,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:08,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [713177755] [2020-08-21 19:04:08,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:08,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:08,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:08,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:08,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:08,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:10,196 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 19:04:10,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [713177755] [2020-08-21 19:04:10,197 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:10,197 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 19:04:10,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838983620] [2020-08-21 19:04:10,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 19:04:10,197 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:10,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 19:04:10,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 19:04:10,198 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 19:04:10,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:10,633 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 19:04:10,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 19:04:10,634 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 19:04:10,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:10,635 INFO L225 Difference]: With dead ends: 112 [2020-08-21 19:04:10,635 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 19:04:10,636 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 19:04:10,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 19:04:10,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 19:04:10,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 19:04:10,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 19:04:10,641 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 19:04:10,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:10,641 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 19:04:10,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 19:04:10,641 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 19:04:10,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 19:04:10,642 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:10,642 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 19:04:10,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 19:04:10,642 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:10,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:10,643 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-21 19:04:10,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:10,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2085083574] [2020-08-21 19:04:10,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:10,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:10,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:10,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:10,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:10,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:12,339 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 19:04:12,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2085083574] [2020-08-21 19:04:12,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:12,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 19:04:12,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005196394] [2020-08-21 19:04:12,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 19:04:12,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:12,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 19:04:12,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 19:04:12,340 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 19:04:12,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:12,792 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 19:04:12,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 19:04:12,793 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 19:04:12,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:12,794 INFO L225 Difference]: With dead ends: 114 [2020-08-21 19:04:12,794 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 19:04:12,795 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 19:04:12,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 19:04:12,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 19:04:12,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 19:04:12,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 19:04:12,801 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 19:04:12,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:12,801 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 19:04:12,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 19:04:12,802 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 19:04:12,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 19:04:12,802 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:12,802 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 19:04:12,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 19:04:12,802 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:12,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:12,803 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-21 19:04:12,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:12,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785284382] [2020-08-21 19:04:12,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:12,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:12,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:12,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:12,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:12,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:14,594 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 19:04:14,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785284382] [2020-08-21 19:04:14,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:14,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 19:04:14,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523995026] [2020-08-21 19:04:14,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 19:04:14,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:14,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 19:04:14,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 19:04:14,597 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 19:04:14,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:14,963 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 19:04:14,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 19:04:14,964 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 19:04:14,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:14,965 INFO L225 Difference]: With dead ends: 116 [2020-08-21 19:04:14,965 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 19:04:14,966 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 19:04:14,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 19:04:14,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 19:04:14,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 19:04:14,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 19:04:14,973 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 19:04:14,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:14,973 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 19:04:14,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 19:04:14,973 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 19:04:14,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 19:04:14,973 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:14,974 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 19:04:14,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 19:04:14,974 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:14,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:14,974 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-21 19:04:14,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:14,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373082378] [2020-08-21 19:04:14,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:14,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:15,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:15,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:15,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:15,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:16,834 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 19:04:16,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373082378] [2020-08-21 19:04:16,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:16,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 19:04:16,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964638101] [2020-08-21 19:04:16,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 19:04:16,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:16,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 19:04:16,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 19:04:16,836 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 19:04:17,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:17,349 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 19:04:17,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 19:04:17,350 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 19:04:17,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:17,351 INFO L225 Difference]: With dead ends: 118 [2020-08-21 19:04:17,352 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 19:04:17,353 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 19:04:17,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 19:04:17,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 19:04:17,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 19:04:17,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 19:04:17,359 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 19:04:17,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:17,360 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 19:04:17,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 19:04:17,360 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 19:04:17,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 19:04:17,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:17,361 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 19:04:17,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 19:04:17,361 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:17,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:17,361 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-21 19:04:17,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:17,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1022052694] [2020-08-21 19:04:17,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:17,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:17,421 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:17,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:17,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:17,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:19,330 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 19:04:19,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1022052694] [2020-08-21 19:04:19,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:19,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 19:04:19,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32135030] [2020-08-21 19:04:19,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 19:04:19,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:19,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 19:04:19,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 19:04:19,332 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 19:04:19,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:19,772 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 19:04:19,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 19:04:19,773 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 19:04:19,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:19,774 INFO L225 Difference]: With dead ends: 120 [2020-08-21 19:04:19,775 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 19:04:19,776 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 19:04:19,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 19:04:19,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 19:04:19,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 19:04:19,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 19:04:19,782 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 19:04:19,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:19,783 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 19:04:19,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 19:04:19,783 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 19:04:19,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 19:04:19,784 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:19,784 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 19:04:19,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 19:04:19,784 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:19,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:19,785 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-21 19:04:19,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:19,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467254529] [2020-08-21 19:04:19,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:19,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:19,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:19,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:19,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:19,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:21,885 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 19:04:21,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467254529] [2020-08-21 19:04:21,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:21,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 19:04:21,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481088519] [2020-08-21 19:04:21,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 19:04:21,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:21,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 19:04:21,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 19:04:21,887 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 19:04:22,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:22,225 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 19:04:22,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 19:04:22,226 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 19:04:22,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:22,227 INFO L225 Difference]: With dead ends: 122 [2020-08-21 19:04:22,227 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 19:04:22,228 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 19:04:22,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 19:04:22,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 19:04:22,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 19:04:22,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 19:04:22,234 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 19:04:22,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:22,234 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 19:04:22,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 19:04:22,234 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 19:04:22,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 19:04:22,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:22,235 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 19:04:22,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 19:04:22,236 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:22,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:22,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-21 19:04:22,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:22,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1421735010] [2020-08-21 19:04:22,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:22,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:22,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:22,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:24,438 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 19:04:24,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1421735010] [2020-08-21 19:04:24,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:24,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 19:04:24,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751155865] [2020-08-21 19:04:24,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 19:04:24,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:24,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 19:04:24,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 19:04:24,440 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 19:04:24,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:24,783 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 19:04:24,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 19:04:24,784 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 19:04:24,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:24,785 INFO L225 Difference]: With dead ends: 124 [2020-08-21 19:04:24,785 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 19:04:24,788 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 19:04:24,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 19:04:24,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 19:04:24,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 19:04:24,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 19:04:24,794 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 19:04:24,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:24,794 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 19:04:24,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 19:04:24,795 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 19:04:24,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 19:04:24,795 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:24,795 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 19:04:24,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 19:04:24,796 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:24,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:24,796 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-21 19:04:24,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:24,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [931369833] [2020-08-21 19:04:24,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:24,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:24,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:24,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:24,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:24,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:27,037 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 19:04:27,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [931369833] [2020-08-21 19:04:27,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:27,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 19:04:27,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1311141165] [2020-08-21 19:04:27,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 19:04:27,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:27,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 19:04:27,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 19:04:27,039 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 19:04:27,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:27,393 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 19:04:27,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 19:04:27,393 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 19:04:27,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:27,395 INFO L225 Difference]: With dead ends: 126 [2020-08-21 19:04:27,395 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 19:04:27,400 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 19:04:27,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 19:04:27,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 19:04:27,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 19:04:27,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 19:04:27,405 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 19:04:27,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:27,405 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 19:04:27,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 19:04:27,405 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 19:04:27,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 19:04:27,406 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:27,407 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 19:04:27,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 19:04:27,407 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:27,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:27,407 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-21 19:04:27,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:27,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [660031616] [2020-08-21 19:04:27,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:27,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:27,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:27,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:27,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:27,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:29,847 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 19:04:29,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [660031616] [2020-08-21 19:04:29,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:29,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 19:04:29,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500530119] [2020-08-21 19:04:29,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 19:04:29,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:29,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 19:04:29,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 19:04:29,849 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 19:04:30,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:30,267 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 19:04:30,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 19:04:30,268 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 19:04:30,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:30,269 INFO L225 Difference]: With dead ends: 128 [2020-08-21 19:04:30,269 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 19:04:30,270 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 19:04:30,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 19:04:30,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 19:04:30,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 19:04:30,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 19:04:30,275 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 19:04:30,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:30,276 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 19:04:30,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 19:04:30,276 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 19:04:30,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 19:04:30,277 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:30,277 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 19:04:30,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 19:04:30,277 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:30,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:30,277 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-21 19:04:30,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:30,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126674988] [2020-08-21 19:04:30,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:30,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:30,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:30,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:30,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:30,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:32,838 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 19:04:32,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126674988] [2020-08-21 19:04:32,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:32,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 19:04:32,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391680057] [2020-08-21 19:04:32,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 19:04:32,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:32,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 19:04:32,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 19:04:32,840 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 19:04:33,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:33,454 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 19:04:33,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 19:04:33,455 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 19:04:33,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:33,456 INFO L225 Difference]: With dead ends: 130 [2020-08-21 19:04:33,456 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 19:04:33,457 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 19:04:33,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 19:04:33,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 19:04:33,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 19:04:33,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 19:04:33,463 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 19:04:33,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:33,464 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 19:04:33,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 19:04:33,464 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 19:04:33,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 19:04:33,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:33,465 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 19:04:33,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 19:04:33,465 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:33,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:33,466 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-21 19:04:33,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:33,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [291851208] [2020-08-21 19:04:33,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:33,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:33,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:33,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 19:04:33,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat