/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=1.0 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 02:52:47,368 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 02:52:47,371 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 02:52:47,402 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 02:52:47,402 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 02:52:47,412 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 02:52:47,413 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 02:52:47,417 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 02:52:47,420 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 02:52:47,421 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 02:52:47,423 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 02:52:47,426 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 02:52:47,426 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 02:52:47,430 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 02:52:47,431 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 02:52:47,433 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 02:52:47,435 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 02:52:47,437 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 02:52:47,439 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 02:52:47,447 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 02:52:47,450 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 02:52:47,451 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 02:52:47,452 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 02:52:47,453 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 02:52:47,465 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 02:52:47,477 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 02:52:47,478 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 02:52:47,479 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 02:52:47,480 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 [2020-08-19 02:52:47,520 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 02:52:47,521 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 02:52:47,522 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 02:52:47,522 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 02:52:47,522 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 02:52:47,522 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 02:52:47,523 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 02:52:47,523 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 02:52:47,523 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 02:52:47,523 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 02:52:47,523 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 02:52:47,524 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 02:52:47,524 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 02:52:47,524 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 02:52:47,524 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 02:52:47,524 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 02:52:47,524 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 02:52:47,525 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 02:52:47,525 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 02:52:47,525 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 02:52:47,525 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 02:52:47,526 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 02:52:47,526 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 02:52:47,526 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 02:52:47,526 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 02:52:47,526 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 02:52:47,527 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 02:52:47,527 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 02:52:47,527 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 02:52:47,527 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=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0; [2020-08-19 02:52:47,810 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 02:52:47,822 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 02:52:47,825 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 02:52:47,826 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 02:52:47,827 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 02:52:47,827 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-19 02:52:47,885 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e21272b07/a0a02afce48c479d8d32d66cddc37764/FLAG289e59644 [2020-08-19 02:52:48,342 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 02:52:48,342 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-19 02:52:48,349 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e21272b07/a0a02afce48c479d8d32d66cddc37764/FLAG289e59644 [2020-08-19 02:52:48,732 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e21272b07/a0a02afce48c479d8d32d66cddc37764 [2020-08-19 02:52:48,743 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 02:52:48,745 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 02:52:48,746 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 02:52:48,746 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 02:52:48,750 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 02:52:48,751 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:52:48" (1/1) ... [2020-08-19 02:52:48,754 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6266eb80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:52:48, skipping insertion in model container [2020-08-19 02:52:48,754 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 02:52:48" (1/1) ... [2020-08-19 02:52:48,762 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 02:52:48,778 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 02:52:48,968 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:52:48,975 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 02:52:48,991 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 02:52:49,006 INFO L208 MainTranslator]: Completed translation [2020-08-19 02:52:49,007 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:52:49 WrapperNode [2020-08-19 02:52:49,007 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 02:52:49,008 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 02:52:49,008 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 02:52:49,008 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 02:52:49,100 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:52:49" (1/1) ... [2020-08-19 02:52:49,100 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:52:49" (1/1) ... [2020-08-19 02:52:49,110 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:52:49" (1/1) ... [2020-08-19 02:52:49,110 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:52:49" (1/1) ... [2020-08-19 02:52:49,119 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:52:49" (1/1) ... [2020-08-19 02:52:49,125 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:52:49" (1/1) ... [2020-08-19 02:52:49,126 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:52:49" (1/1) ... [2020-08-19 02:52:49,130 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 02:52:49,131 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 02:52:49,131 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 02:52:49,131 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 02:52:49,132 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:52:49" (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 [2020-08-19 02:52:49,198 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 02:52:49,198 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 02:52:49,198 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 02:52:49,198 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-19 02:52:49,198 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 02:52:49,199 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 02:52:49,199 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 02:52:49,199 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-19 02:52:49,199 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-19 02:52:49,199 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-19 02:52:49,200 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-19 02:52:49,200 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-19 02:52:49,200 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 02:52:49,200 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 02:52:49,200 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-19 02:52:49,200 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 02:52:49,201 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 02:52:49,201 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 02:52:49,546 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 02:52:49,546 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 02:52:49,551 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:52:49 BoogieIcfgContainer [2020-08-19 02:52:49,551 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 02:52:49,556 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 02:52:49,556 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 02:52:49,560 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 02:52:49,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 02:52:48" (1/3) ... [2020-08-19 02:52:49,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@135a4ed0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:52:49, skipping insertion in model container [2020-08-19 02:52:49,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 02:52:49" (2/3) ... [2020-08-19 02:52:49,563 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@135a4ed0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 02:52:49, skipping insertion in model container [2020-08-19 02:52:49,563 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 02:52:49" (3/3) ... [2020-08-19 02:52:49,565 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-19 02:52:49,577 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 02:52:49,585 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 02:52:49,602 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 02:52:49,626 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 02:52:49,626 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 02:52:49,626 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 02:52:49,627 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 02:52:49,627 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 02:52:49,627 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 02:52:49,627 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 02:52:49,627 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 02:52:49,645 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-19 02:52:49,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 02:52:49,651 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:49,652 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] [2020-08-19 02:52:49,652 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:49,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:49,659 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-19 02:52:49,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:49,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16471503] [2020-08-19 02:52:49,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:49,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:49,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:49,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:49,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:49,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:49,904 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:52:49,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16471503] [2020-08-19 02:52:49,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:52:49,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 02:52:49,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423617382] [2020-08-19 02:52:49,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 02:52:49,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:49,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 02:52:49,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 02:52:49,939 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-19 02:52:50,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:50,101 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-19 02:52:50,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 02:52:50,103 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-19 02:52:50,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:50,115 INFO L225 Difference]: With dead ends: 59 [2020-08-19 02:52:50,115 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 02:52:50,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:52:50,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 02:52:50,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-19 02:52:50,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 02:52:50,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-19 02:52:50,161 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-19 02:52:50,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:50,162 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-19 02:52:50,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 02:52:50,162 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-19 02:52:50,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 02:52:50,164 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:50,164 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] [2020-08-19 02:52:50,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 02:52:50,165 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:50,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:50,165 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-19 02:52:50,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:50,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115683112] [2020-08-19 02:52:50,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:50,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:50,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:50,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:50,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:50,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:50,361 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:52:50,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115683112] [2020-08-19 02:52:50,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:52:50,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-19 02:52:50,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140227679] [2020-08-19 02:52:50,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:52:50,364 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:50,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:52:50,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:52:50,365 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-19 02:52:50,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:50,567 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-19 02:52:50,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 02:52:50,581 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-19 02:52:50,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:50,583 INFO L225 Difference]: With dead ends: 48 [2020-08-19 02:52:50,583 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 02:52:50,584 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 [2020-08-19 02:52:50,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 02:52:50,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 02:52:50,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 02:52:50,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-19 02:52:50,593 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-19 02:52:50,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:50,594 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-19 02:52:50,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:52:50,594 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-19 02:52:50,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 02:52:50,595 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:50,595 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] [2020-08-19 02:52:50,595 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 02:52:50,596 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:50,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:50,596 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-19 02:52:50,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:50,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1939005156] [2020-08-19 02:52:50,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:50,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:50,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:50,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:50,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:50,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:50,781 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:52:50,781 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1939005156] [2020-08-19 02:52:50,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:50,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 02:52:50,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301723972] [2020-08-19 02:52:50,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 02:52:50,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:50,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 02:52:50,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 02:52:50,784 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-19 02:52:51,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:51,005 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-19 02:52:51,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 02:52:51,006 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-19 02:52:51,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:51,007 INFO L225 Difference]: With dead ends: 50 [2020-08-19 02:52:51,007 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 02:52:51,008 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 [2020-08-19 02:52:51,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 02:52:51,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 02:52:51,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 02:52:51,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-19 02:52:51,023 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-19 02:52:51,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:51,024 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-19 02:52:51,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 02:52:51,024 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-19 02:52:51,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 02:52:51,026 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:51,026 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] [2020-08-19 02:52:51,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 02:52:51,027 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:51,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:51,027 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-19 02:52:51,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:51,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [728629657] [2020-08-19 02:52:51,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:51,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:51,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:51,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:51,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:51,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:51,247 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:52:51,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [728629657] [2020-08-19 02:52:51,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:51,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 02:52:51,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074555027] [2020-08-19 02:52:51,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 02:52:51,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:51,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 02:52:51,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-19 02:52:51,250 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-19 02:52:51,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:51,406 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-19 02:52:51,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 02:52:51,407 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-19 02:52:51,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:51,408 INFO L225 Difference]: With dead ends: 52 [2020-08-19 02:52:51,408 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 02:52:51,409 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:52:51,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 02:52:51,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 02:52:51,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 02:52:51,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-19 02:52:51,416 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-19 02:52:51,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:51,417 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-19 02:52:51,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 02:52:51,417 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-19 02:52:51,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 02:52:51,418 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:51,419 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] [2020-08-19 02:52:51,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 02:52:51,419 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:51,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:51,420 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-19 02:52:51,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:51,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323135552] [2020-08-19 02:52:51,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:51,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:51,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:51,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:51,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:51,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:51,674 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:52:51,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323135552] [2020-08-19 02:52:51,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:51,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 02:52:51,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814684444] [2020-08-19 02:52:51,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 02:52:51,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:51,677 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 02:52:51,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 02:52:51,677 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-19 02:52:51,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:51,863 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-19 02:52:51,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 02:52:51,864 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-19 02:52:51,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:51,866 INFO L225 Difference]: With dead ends: 54 [2020-08-19 02:52:51,866 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 02:52:51,868 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 [2020-08-19 02:52:51,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 02:52:51,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 02:52:51,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 02:52:51,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-19 02:52:51,883 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-19 02:52:51,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:51,883 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-19 02:52:51,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 02:52:51,884 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-19 02:52:51,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 02:52:51,885 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:51,885 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] [2020-08-19 02:52:51,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 02:52:51,885 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:51,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:51,886 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-19 02:52:51,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:51,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [454603940] [2020-08-19 02:52:51,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:51,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:51,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:51,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:51,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:52,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:52,204 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:52:52,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [454603940] [2020-08-19 02:52:52,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:52,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 02:52:52,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762983846] [2020-08-19 02:52:52,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 02:52:52,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:52,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 02:52:52,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-19 02:52:52,207 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-19 02:52:52,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:52,397 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-19 02:52:52,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 02:52:52,398 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-19 02:52:52,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:52,399 INFO L225 Difference]: With dead ends: 56 [2020-08-19 02:52:52,399 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 02:52:52,400 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 [2020-08-19 02:52:52,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 02:52:52,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 02:52:52,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 02:52:52,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-19 02:52:52,412 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-19 02:52:52,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:52,413 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-19 02:52:52,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 02:52:52,413 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-19 02:52:52,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 02:52:52,416 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:52,416 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] [2020-08-19 02:52:52,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 02:52:52,417 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:52,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:52,417 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-19 02:52:52,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:52,418 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307710094] [2020-08-19 02:52:52,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:52,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:52,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:52,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:52,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:52,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:52,772 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:52:52,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307710094] [2020-08-19 02:52:52,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:52,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 02:52:52,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059288119] [2020-08-19 02:52:52,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 02:52:52,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:52,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 02:52:52,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 02:52:52,776 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-19 02:52:52,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:52,963 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-19 02:52:52,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 02:52:52,963 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-19 02:52:52,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:52,964 INFO L225 Difference]: With dead ends: 58 [2020-08-19 02:52:52,964 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 02:52:52,966 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 [2020-08-19 02:52:52,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 02:52:52,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-19 02:52:52,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 02:52:52,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-19 02:52:52,976 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-19 02:52:52,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:52,978 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-19 02:52:52,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 02:52:52,978 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-19 02:52:52,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 02:52:52,982 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:52,982 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] [2020-08-19 02:52:52,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 02:52:52,983 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:52,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:52,983 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-19 02:52:52,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:52,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1450751352] [2020-08-19 02:52:52,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:53,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:53,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:53,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:53,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:53,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:53,368 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:52:53,368 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1450751352] [2020-08-19 02:52:53,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:53,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 02:52:53,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918054718] [2020-08-19 02:52:53,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 02:52:53,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:53,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 02:52:53,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-19 02:52:53,370 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-19 02:52:53,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:53,599 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-19 02:52:53,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 02:52:53,599 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-19 02:52:53,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:53,600 INFO L225 Difference]: With dead ends: 60 [2020-08-19 02:52:53,601 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 02:52:53,603 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 [2020-08-19 02:52:53,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 02:52:53,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-19 02:52:53,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 02:52:53,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-19 02:52:53,613 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-19 02:52:53,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:53,613 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-19 02:52:53,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 02:52:53,613 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-19 02:52:53,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 02:52:53,614 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:53,614 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] [2020-08-19 02:52:53,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 02:52:53,615 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:53,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:53,615 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-19 02:52:53,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:53,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1963609576] [2020-08-19 02:52:53,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:53,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:53,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:53,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:53,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:53,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:53,966 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:52:53,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1963609576] [2020-08-19 02:52:53,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:53,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 02:52:53,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871714354] [2020-08-19 02:52:53,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 02:52:53,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:53,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 02:52:53,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-19 02:52:53,969 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-19 02:52:54,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:54,178 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-19 02:52:54,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 02:52:54,179 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-19 02:52:54,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:54,180 INFO L225 Difference]: With dead ends: 62 [2020-08-19 02:52:54,180 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 02:52:54,181 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 [2020-08-19 02:52:54,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 02:52:54,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-19 02:52:54,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 02:52:54,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-19 02:52:54,187 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-19 02:52:54,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:54,187 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-19 02:52:54,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 02:52:54,187 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-19 02:52:54,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 02:52:54,188 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:54,188 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] [2020-08-19 02:52:54,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 02:52:54,189 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:54,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:54,189 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-19 02:52:54,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:54,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105232147] [2020-08-19 02:52:54,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:54,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:54,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:54,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:54,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:54,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:54,564 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 02:52:54,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105232147] [2020-08-19 02:52:54,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:54,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 02:52:54,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403953551] [2020-08-19 02:52:54,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 02:52:54,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:54,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 02:52:54,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-19 02:52:54,567 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-19 02:52:54,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:54,823 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-19 02:52:54,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 02:52:54,823 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-19 02:52:54,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:54,824 INFO L225 Difference]: With dead ends: 64 [2020-08-19 02:52:54,824 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 02:52:54,825 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 [2020-08-19 02:52:54,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 02:52:54,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-19 02:52:54,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 02:52:54,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-19 02:52:54,832 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-19 02:52:54,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:54,832 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-19 02:52:54,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 02:52:54,832 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-19 02:52:54,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 02:52:54,833 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:54,833 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] [2020-08-19 02:52:54,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 02:52:54,833 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:54,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:54,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-19 02:52:54,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:54,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [306813295] [2020-08-19 02:52:54,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:54,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:54,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:54,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:54,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:54,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:54,898 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 02:52:54,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [306813295] [2020-08-19 02:52:54,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:52:54,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 02:52:54,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805113367] [2020-08-19 02:52:54,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:52:54,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:54,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:52:54,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:52:54,901 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-19 02:52:54,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:54,978 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-19 02:52:54,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:52:54,979 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-19 02:52:54,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:54,981 INFO L225 Difference]: With dead ends: 65 [2020-08-19 02:52:54,981 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 02:52:54,982 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 [2020-08-19 02:52:54,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 02:52:54,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-19 02:52:54,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 02:52:54,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-19 02:52:54,992 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-19 02:52:54,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:54,993 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-19 02:52:54,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:52:54,993 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-19 02:52:54,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 02:52:54,994 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:54,994 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] [2020-08-19 02:52:54,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 02:52:54,994 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:54,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:54,995 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-19 02:52:54,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:54,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1004503398] [2020-08-19 02:52:54,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:55,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:55,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:55,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:55,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:55,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:55,092 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 02:52:55,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1004503398] [2020-08-19 02:52:55,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:55,092 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 02:52:55,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863761973] [2020-08-19 02:52:55,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 02:52:55,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:55,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 02:52:55,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 02:52:55,095 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-19 02:52:55,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:55,197 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-19 02:52:55,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 02:52:55,198 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-19 02:52:55,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:55,199 INFO L225 Difference]: With dead ends: 73 [2020-08-19 02:52:55,199 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 02:52:55,200 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 [2020-08-19 02:52:55,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 02:52:55,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-19 02:52:55,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 02:52:55,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-19 02:52:55,206 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-19 02:52:55,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:55,206 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-19 02:52:55,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 02:52:55,207 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-19 02:52:55,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 02:52:55,207 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:55,208 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] [2020-08-19 02:52:55,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 02:52:55,208 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:55,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:55,208 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-19 02:52:55,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:55,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780002086] [2020-08-19 02:52:55,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:55,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:55,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:55,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:55,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:55,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:55,297 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-19 02:52:55,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780002086] [2020-08-19 02:52:55,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 02:52:55,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 02:52:55,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877369815] [2020-08-19 02:52:55,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 02:52:55,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:55,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 02:52:55,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 02:52:55,300 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-19 02:52:55,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:55,383 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-19 02:52:55,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 02:52:55,384 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-19 02:52:55,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:55,387 INFO L225 Difference]: With dead ends: 69 [2020-08-19 02:52:55,387 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 02:52:55,390 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 [2020-08-19 02:52:55,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 02:52:55,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 02:52:55,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 02:52:55,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-19 02:52:55,401 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-19 02:52:55,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:55,402 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-19 02:52:55,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 02:52:55,406 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-19 02:52:55,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 02:52:55,407 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:55,407 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] [2020-08-19 02:52:55,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 02:52:55,407 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:55,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:55,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-19 02:52:55,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:55,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872454778] [2020-08-19 02:52:55,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:55,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:55,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:55,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:55,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:55,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:55,916 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:52:55,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872454778] [2020-08-19 02:52:55,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:55,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 02:52:55,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944824930] [2020-08-19 02:52:55,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 02:52:55,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:55,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 02:52:55,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-19 02:52:55,922 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-19 02:52:56,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:56,172 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-19 02:52:56,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 02:52:56,172 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-19 02:52:56,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:56,174 INFO L225 Difference]: With dead ends: 74 [2020-08-19 02:52:56,174 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 02:52:56,175 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 [2020-08-19 02:52:56,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 02:52:56,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-19 02:52:56,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 02:52:56,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-19 02:52:56,182 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-19 02:52:56,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:56,182 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-19 02:52:56,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 02:52:56,183 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-19 02:52:56,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 02:52:56,183 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:56,183 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] [2020-08-19 02:52:56,184 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 02:52:56,184 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:56,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:56,184 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-19 02:52:56,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:56,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32360483] [2020-08-19 02:52:56,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:56,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:56,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:56,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:56,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:56,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:56,669 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:52:56,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32360483] [2020-08-19 02:52:56,670 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:56,670 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 02:52:56,670 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485536029] [2020-08-19 02:52:56,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 02:52:56,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:56,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 02:52:56,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-19 02:52:56,672 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-19 02:52:56,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:56,896 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-19 02:52:56,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 02:52:56,896 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-19 02:52:56,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:56,897 INFO L225 Difference]: With dead ends: 76 [2020-08-19 02:52:56,897 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 02:52:56,898 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:52:56,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 02:52:56,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-19 02:52:56,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 02:52:56,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-19 02:52:56,903 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-19 02:52:56,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:56,904 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-19 02:52:56,904 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 02:52:56,904 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-19 02:52:56,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 02:52:56,905 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:56,905 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] [2020-08-19 02:52:56,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 02:52:56,905 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:56,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:56,906 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-19 02:52:56,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:56,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [126065268] [2020-08-19 02:52:56,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:56,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:56,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:56,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:56,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:56,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:57,461 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:52:57,461 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [126065268] [2020-08-19 02:52:57,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:57,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 02:52:57,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429702563] [2020-08-19 02:52:57,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 02:52:57,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:57,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 02:52:57,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-19 02:52:57,463 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-19 02:52:57,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:57,695 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-19 02:52:57,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 02:52:57,695 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-19 02:52:57,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:57,696 INFO L225 Difference]: With dead ends: 78 [2020-08-19 02:52:57,696 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 02:52:57,697 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:52:57,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 02:52:57,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-19 02:52:57,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 02:52:57,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-19 02:52:57,702 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-19 02:52:57,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:57,703 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-19 02:52:57,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 02:52:57,703 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-19 02:52:57,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 02:52:57,703 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:57,704 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] [2020-08-19 02:52:57,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 02:52:57,704 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:57,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:57,704 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-19 02:52:57,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:57,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554854753] [2020-08-19 02:52:57,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:57,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:57,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:57,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:57,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:57,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:58,261 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:52:58,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554854753] [2020-08-19 02:52:58,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:58,261 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 02:52:58,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193284848] [2020-08-19 02:52:58,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 02:52:58,262 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:58,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 02:52:58,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-19 02:52:58,263 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-19 02:52:58,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:58,532 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-19 02:52:58,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 02:52:58,533 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-19 02:52:58,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:58,534 INFO L225 Difference]: With dead ends: 80 [2020-08-19 02:52:58,534 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 02:52:58,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:52:58,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 02:52:58,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-19 02:52:58,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 02:52:58,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-19 02:52:58,544 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-19 02:52:58,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:58,545 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-19 02:52:58,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 02:52:58,545 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-19 02:52:58,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 02:52:58,546 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:58,546 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] [2020-08-19 02:52:58,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 02:52:58,547 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:58,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:58,547 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-19 02:52:58,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:58,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96263796] [2020-08-19 02:52:58,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:58,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:58,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:58,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:58,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:58,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:59,226 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:52:59,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96263796] [2020-08-19 02:52:59,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:52:59,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 02:52:59,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906307433] [2020-08-19 02:52:59,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 02:52:59,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:52:59,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 02:52:59,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-19 02:52:59,229 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-19 02:52:59,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:52:59,470 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-19 02:52:59,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 02:52:59,470 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-19 02:52:59,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:52:59,471 INFO L225 Difference]: With dead ends: 82 [2020-08-19 02:52:59,471 INFO L226 Difference]: Without dead ends: 60 [2020-08-19 02:52:59,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-19 02:52:59,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-19 02:52:59,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-19 02:52:59,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 02:52:59,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-19 02:52:59,477 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-19 02:52:59,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:52:59,478 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-19 02:52:59,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 02:52:59,478 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-19 02:52:59,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 02:52:59,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:52:59,479 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] [2020-08-19 02:52:59,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 02:52:59,479 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:52:59,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:52:59,479 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-19 02:52:59,481 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:52:59,481 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [609887791] [2020-08-19 02:52:59,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:52:59,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:59,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:52:59,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:52:59,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:52:59,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:00,142 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:00,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [609887791] [2020-08-19 02:53:00,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:00,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 02:53:00,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697767985] [2020-08-19 02:53:00,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 02:53:00,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:00,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 02:53:00,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-19 02:53:00,144 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-19 02:53:00,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:00,415 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-19 02:53:00,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 02:53:00,419 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-19 02:53:00,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:00,420 INFO L225 Difference]: With dead ends: 84 [2020-08-19 02:53:00,420 INFO L226 Difference]: Without dead ends: 62 [2020-08-19 02:53:00,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:53:00,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-19 02:53:00,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-19 02:53:00,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-19 02:53:00,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-19 02:53:00,428 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-19 02:53:00,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:00,428 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-19 02:53:00,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 02:53:00,429 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-19 02:53:00,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 02:53:00,429 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:00,429 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] [2020-08-19 02:53:00,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 02:53:00,430 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:00,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:00,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-19 02:53:00,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:00,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1809229140] [2020-08-19 02:53:00,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:00,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:00,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:00,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:00,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:00,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:01,159 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:01,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1809229140] [2020-08-19 02:53:01,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:01,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 02:53:01,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125244720] [2020-08-19 02:53:01,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 02:53:01,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:01,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 02:53:01,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-19 02:53:01,161 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-19 02:53:01,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:01,414 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-19 02:53:01,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 02:53:01,415 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-19 02:53:01,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:01,416 INFO L225 Difference]: With dead ends: 86 [2020-08-19 02:53:01,416 INFO L226 Difference]: Without dead ends: 64 [2020-08-19 02:53:01,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-19 02:53:01,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-19 02:53:01,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-19 02:53:01,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-19 02:53:01,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-19 02:53:01,424 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-19 02:53:01,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:01,424 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-19 02:53:01,424 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 02:53:01,424 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-19 02:53:01,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 02:53:01,425 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:01,425 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] [2020-08-19 02:53:01,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 02:53:01,426 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:01,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:01,426 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-19 02:53:01,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:01,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1993515745] [2020-08-19 02:53:01,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:01,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:01,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:01,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:01,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:01,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:02,419 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:02,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1993515745] [2020-08-19 02:53:02,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:02,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 02:53:02,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13299297] [2020-08-19 02:53:02,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 02:53:02,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:02,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 02:53:02,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-19 02:53:02,422 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-19 02:53:02,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:02,776 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-19 02:53:02,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 02:53:02,776 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-19 02:53:02,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:02,777 INFO L225 Difference]: With dead ends: 88 [2020-08-19 02:53:02,777 INFO L226 Difference]: Without dead ends: 66 [2020-08-19 02:53:02,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:53:02,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-19 02:53:02,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-19 02:53:02,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-19 02:53:02,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-19 02:53:02,783 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-19 02:53:02,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:02,783 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-19 02:53:02,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 02:53:02,783 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-19 02:53:02,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-19 02:53:02,784 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:02,784 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] [2020-08-19 02:53:02,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 02:53:02,785 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:02,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:02,785 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-19 02:53:02,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:02,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [130454394] [2020-08-19 02:53:02,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:02,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:02,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:02,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:02,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:02,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:03,617 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:03,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [130454394] [2020-08-19 02:53:03,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:03,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 02:53:03,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444237801] [2020-08-19 02:53:03,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 02:53:03,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:03,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 02:53:03,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-19 02:53:03,620 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-19 02:53:03,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:03,967 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-19 02:53:03,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 02:53:03,969 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-19 02:53:03,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:03,970 INFO L225 Difference]: With dead ends: 90 [2020-08-19 02:53:03,971 INFO L226 Difference]: Without dead ends: 68 [2020-08-19 02:53:03,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-19 02:53:03,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-19 02:53:03,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-19 02:53:03,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-19 02:53:03,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-19 02:53:03,979 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-19 02:53:03,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:03,980 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-19 02:53:03,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 02:53:03,980 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-19 02:53:03,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-19 02:53:03,981 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:03,981 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] [2020-08-19 02:53:03,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 02:53:03,982 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:03,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:03,982 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-19 02:53:03,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:03,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1609476878] [2020-08-19 02:53:03,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:04,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:04,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:04,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:04,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:04,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:04,965 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:04,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1609476878] [2020-08-19 02:53:04,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:04,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 02:53:04,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904688450] [2020-08-19 02:53:04,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 02:53:04,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:04,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 02:53:04,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-19 02:53:04,968 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-19 02:53:05,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:05,246 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-19 02:53:05,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 02:53:05,246 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-19 02:53:05,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:05,248 INFO L225 Difference]: With dead ends: 92 [2020-08-19 02:53:05,248 INFO L226 Difference]: Without dead ends: 70 [2020-08-19 02:53:05,249 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 [2020-08-19 02:53:05,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-19 02:53:05,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-19 02:53:05,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-19 02:53:05,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-19 02:53:05,253 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-19 02:53:05,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:05,254 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-19 02:53:05,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 02:53:05,254 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-19 02:53:05,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-19 02:53:05,255 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:05,255 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] [2020-08-19 02:53:05,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 02:53:05,255 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:05,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:05,256 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-19 02:53:05,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:05,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142573108] [2020-08-19 02:53:05,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:05,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:05,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:05,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:05,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:05,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:06,290 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:06,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142573108] [2020-08-19 02:53:06,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:06,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 02:53:06,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268575888] [2020-08-19 02:53:06,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 02:53:06,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:06,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 02:53:06,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-19 02:53:06,294 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-19 02:53:06,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:06,606 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-19 02:53:06,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 02:53:06,606 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-19 02:53:06,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:06,607 INFO L225 Difference]: With dead ends: 94 [2020-08-19 02:53:06,608 INFO L226 Difference]: Without dead ends: 72 [2020-08-19 02:53:06,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-19 02:53:06,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-19 02:53:06,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-19 02:53:06,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-19 02:53:06,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-19 02:53:06,614 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-19 02:53:06,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:06,615 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-19 02:53:06,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 02:53:06,615 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-19 02:53:06,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-19 02:53:06,615 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:06,616 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] [2020-08-19 02:53:06,617 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 02:53:06,619 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:06,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:06,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-19 02:53:06,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:06,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [105916495] [2020-08-19 02:53:06,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:06,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:06,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:06,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:06,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:06,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:07,628 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:07,629 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [105916495] [2020-08-19 02:53:07,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:07,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 02:53:07,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279184189] [2020-08-19 02:53:07,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 02:53:07,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:07,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 02:53:07,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-19 02:53:07,631 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-19 02:53:08,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:08,020 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-19 02:53:08,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 02:53:08,020 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-19 02:53:08,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:08,022 INFO L225 Difference]: With dead ends: 96 [2020-08-19 02:53:08,022 INFO L226 Difference]: Without dead ends: 74 [2020-08-19 02:53:08,023 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 [2020-08-19 02:53:08,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-19 02:53:08,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-19 02:53:08,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-19 02:53:08,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-19 02:53:08,027 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-19 02:53:08,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:08,028 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-19 02:53:08,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 02:53:08,028 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-19 02:53:08,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-19 02:53:08,028 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:08,029 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] [2020-08-19 02:53:08,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 02:53:08,029 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:08,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:08,029 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-19 02:53:08,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:08,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [757464187] [2020-08-19 02:53:08,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:08,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:08,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:08,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:08,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:08,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:09,080 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:09,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [757464187] [2020-08-19 02:53:09,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:09,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 02:53:09,081 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943407750] [2020-08-19 02:53:09,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 02:53:09,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:09,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 02:53:09,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-19 02:53:09,082 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-19 02:53:09,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:09,324 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-19 02:53:09,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 02:53:09,324 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-19 02:53:09,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:09,325 INFO L225 Difference]: With dead ends: 98 [2020-08-19 02:53:09,325 INFO L226 Difference]: Without dead ends: 76 [2020-08-19 02:53:09,326 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-19 02:53:09,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-19 02:53:09,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-19 02:53:09,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-19 02:53:09,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-19 02:53:09,331 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-19 02:53:09,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:09,331 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-19 02:53:09,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 02:53:09,331 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-19 02:53:09,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-19 02:53:09,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:09,332 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] [2020-08-19 02:53:09,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 02:53:09,332 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:09,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:09,332 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-19 02:53:09,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:09,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1948520914] [2020-08-19 02:53:09,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:09,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:09,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:09,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:09,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:09,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:10,619 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:10,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1948520914] [2020-08-19 02:53:10,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:10,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 02:53:10,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861659598] [2020-08-19 02:53:10,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 02:53:10,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:10,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 02:53:10,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-19 02:53:10,621 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-19 02:53:11,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:11,014 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-19 02:53:11,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 02:53:11,015 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-19 02:53:11,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:11,016 INFO L225 Difference]: With dead ends: 100 [2020-08-19 02:53:11,016 INFO L226 Difference]: Without dead ends: 78 [2020-08-19 02:53:11,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-19 02:53:11,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-19 02:53:11,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-19 02:53:11,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-19 02:53:11,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-19 02:53:11,029 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-19 02:53:11,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:11,029 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-19 02:53:11,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 02:53:11,029 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-19 02:53:11,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-19 02:53:11,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:11,030 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] [2020-08-19 02:53:11,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 02:53:11,030 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:11,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:11,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-19 02:53:11,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:11,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2070487439] [2020-08-19 02:53:11,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:11,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:11,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:11,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:11,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:11,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:12,342 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:12,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2070487439] [2020-08-19 02:53:12,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:12,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 02:53:12,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019028284] [2020-08-19 02:53:12,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 02:53:12,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:12,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 02:53:12,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-19 02:53:12,346 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-19 02:53:12,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:12,759 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-19 02:53:12,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 02:53:12,759 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-19 02:53:12,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:12,760 INFO L225 Difference]: With dead ends: 102 [2020-08-19 02:53:12,760 INFO L226 Difference]: Without dead ends: 80 [2020-08-19 02:53:12,761 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-19 02:53:12,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-19 02:53:12,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-19 02:53:12,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-19 02:53:12,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-19 02:53:12,766 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-19 02:53:12,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:12,766 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-19 02:53:12,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 02:53:12,767 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-19 02:53:12,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-19 02:53:12,769 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:12,769 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] [2020-08-19 02:53:12,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 02:53:12,770 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:12,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:12,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-19 02:53:12,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:12,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698285069] [2020-08-19 02:53:12,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:12,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:12,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:12,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:12,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:12,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:14,045 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:14,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698285069] [2020-08-19 02:53:14,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:14,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 02:53:14,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847244894] [2020-08-19 02:53:14,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 02:53:14,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:14,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 02:53:14,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-19 02:53:14,047 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-19 02:53:14,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:14,359 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-19 02:53:14,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 02:53:14,360 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-19 02:53:14,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:14,361 INFO L225 Difference]: With dead ends: 104 [2020-08-19 02:53:14,361 INFO L226 Difference]: Without dead ends: 82 [2020-08-19 02:53:14,362 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 [2020-08-19 02:53:14,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-19 02:53:14,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-19 02:53:14,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-19 02:53:14,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-19 02:53:14,367 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-19 02:53:14,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:14,368 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-19 02:53:14,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 02:53:14,368 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-19 02:53:14,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-19 02:53:14,369 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:14,369 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] [2020-08-19 02:53:14,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 02:53:14,369 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:14,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:14,370 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-19 02:53:14,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:14,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1381019179] [2020-08-19 02:53:14,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:14,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:14,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:14,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:14,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:14,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:15,772 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:15,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1381019179] [2020-08-19 02:53:15,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:15,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 02:53:15,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140742197] [2020-08-19 02:53:15,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 02:53:15,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:15,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 02:53:15,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-19 02:53:15,775 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-19 02:53:16,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:16,176 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-19 02:53:16,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 02:53:16,176 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-19 02:53:16,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:16,177 INFO L225 Difference]: With dead ends: 106 [2020-08-19 02:53:16,177 INFO L226 Difference]: Without dead ends: 84 [2020-08-19 02:53:16,178 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 [2020-08-19 02:53:16,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-19 02:53:16,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-19 02:53:16,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-19 02:53:16,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-19 02:53:16,183 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-19 02:53:16,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:16,183 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-19 02:53:16,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 02:53:16,184 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-19 02:53:16,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-19 02:53:16,184 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:16,185 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] [2020-08-19 02:53:16,185 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 02:53:16,185 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:16,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:16,185 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-19 02:53:16,186 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:16,186 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628941035] [2020-08-19 02:53:16,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:16,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:16,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:16,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:16,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:16,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:17,654 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:17,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628941035] [2020-08-19 02:53:17,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:17,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 02:53:17,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543610672] [2020-08-19 02:53:17,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 02:53:17,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:17,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 02:53:17,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-19 02:53:17,655 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-19 02:53:18,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:18,052 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-19 02:53:18,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 02:53:18,053 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-19 02:53:18,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:18,054 INFO L225 Difference]: With dead ends: 108 [2020-08-19 02:53:18,054 INFO L226 Difference]: Without dead ends: 86 [2020-08-19 02:53:18,055 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 [2020-08-19 02:53:18,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-19 02:53:18,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-19 02:53:18,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-19 02:53:18,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-19 02:53:18,059 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-19 02:53:18,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:18,060 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-19 02:53:18,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 02:53:18,060 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-19 02:53:18,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-19 02:53:18,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:18,061 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] [2020-08-19 02:53:18,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 02:53:18,061 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:18,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:18,062 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-19 02:53:18,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:18,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1946387929] [2020-08-19 02:53:18,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:18,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:18,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:18,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:18,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:18,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:19,569 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:19,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1946387929] [2020-08-19 02:53:19,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:19,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 02:53:19,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256385200] [2020-08-19 02:53:19,570 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 02:53:19,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:19,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 02:53:19,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 02:53:19,571 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-19 02:53:20,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:20,025 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-19 02:53:20,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 02:53:20,026 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-19 02:53:20,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:20,027 INFO L225 Difference]: With dead ends: 110 [2020-08-19 02:53:20,027 INFO L226 Difference]: Without dead ends: 88 [2020-08-19 02:53:20,028 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 [2020-08-19 02:53:20,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-19 02:53:20,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-19 02:53:20,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-19 02:53:20,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-19 02:53:20,033 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-19 02:53:20,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:20,033 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-19 02:53:20,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 02:53:20,034 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-19 02:53:20,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-19 02:53:20,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:20,034 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] [2020-08-19 02:53:20,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 02:53:20,035 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:20,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:20,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-19 02:53:20,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:20,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [469842784] [2020-08-19 02:53:20,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:20,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:20,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:20,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:20,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:20,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:21,681 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:21,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [469842784] [2020-08-19 02:53:21,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:21,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 02:53:21,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135499627] [2020-08-19 02:53:21,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 02:53:21,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:21,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 02:53:21,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 02:53:21,683 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-19 02:53:22,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:22,151 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-19 02:53:22,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 02:53:22,152 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-19 02:53:22,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:22,153 INFO L225 Difference]: With dead ends: 112 [2020-08-19 02:53:22,153 INFO L226 Difference]: Without dead ends: 90 [2020-08-19 02:53:22,155 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 [2020-08-19 02:53:22,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-19 02:53:22,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-19 02:53:22,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-19 02:53:22,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-19 02:53:22,160 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-19 02:53:22,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:22,160 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-19 02:53:22,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 02:53:22,161 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-19 02:53:22,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-19 02:53:22,161 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:22,162 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] [2020-08-19 02:53:22,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 02:53:22,162 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:22,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:22,162 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-19 02:53:22,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:22,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730555924] [2020-08-19 02:53:22,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:22,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:22,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:22,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:22,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:22,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:23,888 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:23,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [730555924] [2020-08-19 02:53:23,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:23,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 02:53:23,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935482664] [2020-08-19 02:53:23,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 02:53:23,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:23,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 02:53:23,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 02:53:23,891 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-19 02:53:24,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:24,382 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-19 02:53:24,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 02:53:24,382 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-19 02:53:24,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:24,383 INFO L225 Difference]: With dead ends: 114 [2020-08-19 02:53:24,384 INFO L226 Difference]: Without dead ends: 92 [2020-08-19 02:53:24,385 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 [2020-08-19 02:53:24,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-19 02:53:24,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-19 02:53:24,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-19 02:53:24,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-19 02:53:24,390 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-19 02:53:24,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:24,390 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-19 02:53:24,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 02:53:24,390 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-19 02:53:24,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-19 02:53:24,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:24,391 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] [2020-08-19 02:53:24,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 02:53:24,392 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:24,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:24,392 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-19 02:53:24,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:24,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [865859043] [2020-08-19 02:53:24,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:24,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:24,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:24,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:24,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:24,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:26,245 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:26,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [865859043] [2020-08-19 02:53:26,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:26,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 02:53:26,246 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106804299] [2020-08-19 02:53:26,246 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 02:53:26,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:26,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 02:53:26,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 02:53:26,247 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-19 02:53:26,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:26,603 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-19 02:53:26,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 02:53:26,607 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-19 02:53:26,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:26,608 INFO L225 Difference]: With dead ends: 116 [2020-08-19 02:53:26,608 INFO L226 Difference]: Without dead ends: 94 [2020-08-19 02:53:26,609 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 [2020-08-19 02:53:26,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-19 02:53:26,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-19 02:53:26,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-19 02:53:26,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-19 02:53:26,614 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-19 02:53:26,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:26,615 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-19 02:53:26,615 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 02:53:26,615 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-19 02:53:26,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-19 02:53:26,616 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:26,616 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] [2020-08-19 02:53:26,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 02:53:26,616 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:26,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:26,616 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-19 02:53:26,617 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:26,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567892343] [2020-08-19 02:53:26,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:26,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:26,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:26,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:26,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:26,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:28,519 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:28,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567892343] [2020-08-19 02:53:28,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:28,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 02:53:28,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724312204] [2020-08-19 02:53:28,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 02:53:28,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:28,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 02:53:28,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 02:53:28,521 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-19 02:53:29,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:29,006 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-19 02:53:29,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 02:53:29,007 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-19 02:53:29,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:29,008 INFO L225 Difference]: With dead ends: 118 [2020-08-19 02:53:29,008 INFO L226 Difference]: Without dead ends: 96 [2020-08-19 02:53:29,010 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 [2020-08-19 02:53:29,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-19 02:53:29,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-19 02:53:29,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-19 02:53:29,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-19 02:53:29,015 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-19 02:53:29,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:29,015 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-19 02:53:29,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 02:53:29,015 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-19 02:53:29,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-19 02:53:29,016 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:29,016 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] [2020-08-19 02:53:29,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 02:53:29,016 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:29,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:29,016 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-19 02:53:29,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:29,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548736049] [2020-08-19 02:53:29,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:29,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:29,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:29,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:29,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:29,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:31,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:31,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548736049] [2020-08-19 02:53:31,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:31,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 02:53:31,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394284280] [2020-08-19 02:53:31,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 02:53:31,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:31,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 02:53:31,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 02:53:31,008 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-19 02:53:31,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:31,442 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-19 02:53:31,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 02:53:31,443 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-19 02:53:31,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:31,443 INFO L225 Difference]: With dead ends: 120 [2020-08-19 02:53:31,444 INFO L226 Difference]: Without dead ends: 98 [2020-08-19 02:53:31,445 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 [2020-08-19 02:53:31,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-19 02:53:31,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-19 02:53:31,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-19 02:53:31,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-19 02:53:31,449 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-19 02:53:31,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:31,450 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-19 02:53:31,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 02:53:31,450 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-19 02:53:31,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-19 02:53:31,451 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:31,451 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] [2020-08-19 02:53:31,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 02:53:31,451 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:31,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:31,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-19 02:53:31,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:31,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [990715857] [2020-08-19 02:53:31,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:31,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:31,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:31,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:31,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:31,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:33,577 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:33,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [990715857] [2020-08-19 02:53:33,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:33,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 02:53:33,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271224556] [2020-08-19 02:53:33,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 02:53:33,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:33,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 02:53:33,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 02:53:33,580 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-19 02:53:33,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:33,935 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-19 02:53:33,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 02:53:33,936 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-19 02:53:33,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:33,937 INFO L225 Difference]: With dead ends: 122 [2020-08-19 02:53:33,937 INFO L226 Difference]: Without dead ends: 100 [2020-08-19 02:53:33,938 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 [2020-08-19 02:53:33,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-19 02:53:33,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-19 02:53:33,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-19 02:53:33,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-19 02:53:33,943 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-19 02:53:33,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:33,943 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-19 02:53:33,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 02:53:33,943 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-19 02:53:33,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-19 02:53:33,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:33,944 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] [2020-08-19 02:53:33,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 02:53:33,945 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:33,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:33,945 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-19 02:53:33,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:33,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1409223033] [2020-08-19 02:53:33,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:33,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:34,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:34,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:34,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:34,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:36,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:36,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1409223033] [2020-08-19 02:53:36,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:36,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 02:53:36,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118592587] [2020-08-19 02:53:36,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 02:53:36,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:36,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 02:53:36,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 02:53:36,111 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-19 02:53:36,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:36,439 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-19 02:53:36,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 02:53:36,440 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-19 02:53:36,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:36,441 INFO L225 Difference]: With dead ends: 124 [2020-08-19 02:53:36,441 INFO L226 Difference]: Without dead ends: 102 [2020-08-19 02:53:36,442 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 02:53:36,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-19 02:53:36,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-19 02:53:36,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-19 02:53:36,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-19 02:53:36,447 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-19 02:53:36,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:36,448 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-19 02:53:36,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 02:53:36,448 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-19 02:53:36,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-19 02:53:36,449 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:36,449 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] [2020-08-19 02:53:36,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 02:53:36,449 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:36,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:36,450 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-19 02:53:36,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:36,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223461293] [2020-08-19 02:53:36,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:36,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:36,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:36,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:36,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:36,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:38,805 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:38,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223461293] [2020-08-19 02:53:38,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:38,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 02:53:38,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772032386] [2020-08-19 02:53:38,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 02:53:38,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:38,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 02:53:38,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 02:53:38,807 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-19 02:53:39,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:39,193 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-19 02:53:39,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 02:53:39,197 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-19 02:53:39,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:39,198 INFO L225 Difference]: With dead ends: 126 [2020-08-19 02:53:39,198 INFO L226 Difference]: Without dead ends: 104 [2020-08-19 02:53:39,198 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 02:53:39,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-19 02:53:39,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-19 02:53:39,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-19 02:53:39,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-19 02:53:39,203 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-19 02:53:39,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:39,204 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-19 02:53:39,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 02:53:39,204 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-19 02:53:39,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-19 02:53:39,205 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:39,205 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] [2020-08-19 02:53:39,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 02:53:39,205 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:39,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:39,206 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-19 02:53:39,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:39,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762682122] [2020-08-19 02:53:39,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:39,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:39,266 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:39,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:39,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:39,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:41,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:41,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762682122] [2020-08-19 02:53:41,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:41,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 02:53:41,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [632642858] [2020-08-19 02:53:41,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 02:53:41,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:41,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 02:53:41,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 02:53:41,617 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-19 02:53:42,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:42,137 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-19 02:53:42,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 02:53:42,138 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-19 02:53:42,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:42,142 INFO L225 Difference]: With dead ends: 128 [2020-08-19 02:53:42,142 INFO L226 Difference]: Without dead ends: 106 [2020-08-19 02:53:42,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 02:53:42,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-19 02:53:42,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-19 02:53:42,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-19 02:53:42,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-19 02:53:42,158 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-19 02:53:42,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:42,159 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-19 02:53:42,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 02:53:42,159 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-19 02:53:42,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-19 02:53:42,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:42,160 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] [2020-08-19 02:53:42,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 02:53:42,160 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:42,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:42,161 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-19 02:53:42,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:42,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [843199214] [2020-08-19 02:53:42,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:42,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:42,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:42,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:42,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:42,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:44,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 02:53:44,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [843199214] [2020-08-19 02:53:44,755 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 02:53:44,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 02:53:44,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545474171] [2020-08-19 02:53:44,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 02:53:44,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 02:53:44,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 02:53:44,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 02:53:44,757 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-19 02:53:45,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 02:53:45,353 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-19 02:53:45,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 02:53:45,354 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-19 02:53:45,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 02:53:45,355 INFO L225 Difference]: With dead ends: 130 [2020-08-19 02:53:45,355 INFO L226 Difference]: Without dead ends: 108 [2020-08-19 02:53:45,357 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 [2020-08-19 02:53:45,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-19 02:53:45,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-19 02:53:45,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-19 02:53:45,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-19 02:53:45,367 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-19 02:53:45,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 02:53:45,368 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-19 02:53:45,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 02:53:45,368 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-19 02:53:45,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-19 02:53:45,370 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 02:53:45,370 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] [2020-08-19 02:53:45,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 02:53:45,370 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 02:53:45,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 02:53:45,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-19 02:53:45,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 02:53:45,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654857576] [2020-08-19 02:53:45,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 02:53:45,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:45,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 02:53:45,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 02:53:45,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 02:53:45,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat