/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 22:17:54,413 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 22:17:54,415 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 22:17:54,438 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 22:17:54,439 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 22:17:54,440 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 22:17:54,441 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 22:17:54,443 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 22:17:54,444 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 22:17:54,445 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 22:17:54,446 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 22:17:54,447 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 22:17:54,448 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 22:17:54,451 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 22:17:54,452 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 22:17:54,453 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 22:17:54,454 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 22:17:54,455 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 22:17:54,456 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 22:17:54,458 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 22:17:54,460 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 22:17:54,461 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 22:17:54,462 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 22:17:54,462 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 22:17:54,465 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 22:17:54,465 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 22:17:54,465 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 22:17:54,466 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 22:17:54,466 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 22:17:54,467 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 22:17:54,468 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 22:17:54,468 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 22:17:54,469 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 22:17:54,470 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 22:17:54,471 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 22:17:54,471 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 22:17:54,472 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 22:17:54,472 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 22:17:54,472 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 22:17:54,473 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 22:17:54,474 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 22:17:54,474 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 22:17:54,498 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 22:17:54,498 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 22:17:54,503 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 22:17:54,503 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 22:17:54,504 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 22:17:54,504 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 22:17:54,504 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 22:17:54,504 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 22:17:54,504 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 22:17:54,504 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 22:17:54,504 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 22:17:54,505 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 22:17:54,505 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 22:17:54,505 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 22:17:54,505 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 22:17:54,505 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 22:17:54,506 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 22:17:54,508 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 22:17:54,508 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 22:17:54,508 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 22:17:54,508 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 22:17:54,508 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 22:17:54,509 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 22:17:54,509 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 22:17:54,509 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 22:17:54,509 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 22:17:54,509 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 22:17:54,509 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 22:17:54,510 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 22:17:54,510 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; [2020-08-21 22:17:54,801 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 22:17:54,815 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 22:17:54,824 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 22:17:54,827 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 22:17:54,827 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 22:17:54,828 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-21 22:17:54,904 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31ff9a683/6027a4f198ba41b2963e18fc3e292dff/FLAG32623988d [2020-08-21 22:17:55,373 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 22:17:55,374 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-21 22:17:55,381 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31ff9a683/6027a4f198ba41b2963e18fc3e292dff/FLAG32623988d [2020-08-21 22:17:55,736 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31ff9a683/6027a4f198ba41b2963e18fc3e292dff [2020-08-21 22:17:55,744 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 22:17:55,746 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 22:17:55,747 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 22:17:55,747 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 22:17:55,750 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 22:17:55,751 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:17:55" (1/1) ... [2020-08-21 22:17:55,754 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c1daf07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:55, skipping insertion in model container [2020-08-21 22:17:55,754 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:17:55" (1/1) ... [2020-08-21 22:17:55,763 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 22:17:55,781 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 22:17:55,996 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:17:56,045 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 22:17:56,068 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:17:56,216 INFO L208 MainTranslator]: Completed translation [2020-08-21 22:17:56,216 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56 WrapperNode [2020-08-21 22:17:56,217 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 22:17:56,221 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 22:17:56,221 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 22:17:56,221 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 22:17:56,235 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,235 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,246 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,246 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,254 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,259 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,260 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... [2020-08-21 22:17:56,262 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 22:17:56,263 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 22:17:56,263 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 22:17:56,263 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 22:17:56,264 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 22:17:56,319 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 22:17:56,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 22:17:56,320 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 22:17:56,320 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 22:17:56,320 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 22:17:56,320 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 22:17:56,320 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 22:17:56,321 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 22:17:56,321 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 22:17:56,321 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-21 22:17:56,321 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 22:17:56,321 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 22:17:56,560 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 22:17:56,560 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 22:17:56,564 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:17:56 BoogieIcfgContainer [2020-08-21 22:17:56,564 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 22:17:56,566 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 22:17:56,566 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 22:17:56,569 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 22:17:56,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 10:17:55" (1/3) ... [2020-08-21 22:17:56,570 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f96865b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:17:56, skipping insertion in model container [2020-08-21 22:17:56,570 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:17:56" (2/3) ... [2020-08-21 22:17:56,571 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f96865b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:17:56, skipping insertion in model container [2020-08-21 22:17:56,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:17:56" (3/3) ... [2020-08-21 22:17:56,573 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-21 22:17:56,588 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 22:17:56,598 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 22:17:56,619 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 22:17:56,650 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 22:17:56,650 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 22:17:56,650 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 22:17:56,650 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 22:17:56,651 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 22:17:56,651 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 22:17:56,651 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 22:17:56,651 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 22:17:56,681 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-21 22:17:56,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-21 22:17:56,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:56,694 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:56,694 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:56,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:56,700 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-21 22:17:56,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:56,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [68566243] [2020-08-21 22:17:56,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:56,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:56,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:56,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:56,915 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:56,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [68566243] [2020-08-21 22:17:56,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:17:56,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 22:17:56,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034508386] [2020-08-21 22:17:56,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 22:17:56,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:56,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 22:17:56,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 22:17:56,936 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-21 22:17:57,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:57,038 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-21 22:17:57,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 22:17:57,040 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-21 22:17:57,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:57,050 INFO L225 Difference]: With dead ends: 42 [2020-08-21 22:17:57,050 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 22:17:57,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 22:17:57,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 22:17:57,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-21 22:17:57,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 22:17:57,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 22:17:57,084 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-21 22:17:57,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:57,085 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 22:17:57,085 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 22:17:57,085 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 22:17:57,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-21 22:17:57,086 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:57,086 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:57,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 22:17:57,087 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:57,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:57,087 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-21 22:17:57,087 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:57,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1379207795] [2020-08-21 22:17:57,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:57,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:57,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,181 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:57,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1379207795] [2020-08-21 22:17:57,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:17:57,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 22:17:57,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896282583] [2020-08-21 22:17:57,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 22:17:57,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:57,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 22:17:57,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 22:17:57,189 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-21 22:17:57,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:57,303 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-21 22:17:57,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 22:17:57,304 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-21 22:17:57,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:57,305 INFO L225 Difference]: With dead ends: 36 [2020-08-21 22:17:57,305 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 22:17:57,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:17:57,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 22:17:57,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-21 22:17:57,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 22:17:57,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 22:17:57,314 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-21 22:17:57,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:57,314 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 22:17:57,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 22:17:57,315 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 22:17:57,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 22:17:57,315 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:57,316 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:57,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 22:17:57,316 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:57,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:57,317 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-21 22:17:57,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:57,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377398462] [2020-08-21 22:17:57,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:57,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:57,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,404 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:57,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377398462] [2020-08-21 22:17:57,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:17:57,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 22:17:57,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812820607] [2020-08-21 22:17:57,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 22:17:57,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:57,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 22:17:57,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 22:17:57,407 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-21 22:17:57,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:57,521 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-21 22:17:57,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 22:17:57,522 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-21 22:17:57,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:57,523 INFO L225 Difference]: With dead ends: 40 [2020-08-21 22:17:57,523 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 22:17:57,524 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:17:57,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 22:17:57,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-21 22:17:57,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 22:17:57,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-21 22:17:57,532 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-21 22:17:57,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:57,532 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-21 22:17:57,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 22:17:57,533 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-21 22:17:57,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 22:17:57,534 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:57,534 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:57,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 22:17:57,535 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:57,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:57,535 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-21 22:17:57,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:57,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775435873] [2020-08-21 22:17:57,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:57,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:57,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,611 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:57,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775435873] [2020-08-21 22:17:57,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:17:57,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 22:17:57,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966387194] [2020-08-21 22:17:57,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 22:17:57,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:57,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 22:17:57,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 22:17:57,614 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-21 22:17:57,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:57,687 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-21 22:17:57,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 22:17:57,688 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-21 22:17:57,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:57,689 INFO L225 Difference]: With dead ends: 31 [2020-08-21 22:17:57,689 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 22:17:57,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:17:57,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 22:17:57,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-21 22:17:57,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 22:17:57,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-21 22:17:57,696 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-21 22:17:57,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:57,697 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-21 22:17:57,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 22:17:57,697 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-21 22:17:57,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 22:17:57,698 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:57,698 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:57,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 22:17:57,698 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:57,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:57,699 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-21 22:17:57,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:57,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1036283357] [2020-08-21 22:17:57,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:57,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:57,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:57,820 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:57,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1036283357] [2020-08-21 22:17:57,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:17:57,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 22:17:57,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245748777] [2020-08-21 22:17:57,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 22:17:57,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:57,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 22:17:57,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:17:57,823 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-21 22:17:57,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:57,905 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-21 22:17:57,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 22:17:57,905 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-21 22:17:57,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:57,906 INFO L225 Difference]: With dead ends: 34 [2020-08-21 22:17:57,906 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 22:17:57,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:17:57,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 22:17:57,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-21 22:17:57,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 22:17:57,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-21 22:17:57,913 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-21 22:17:57,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:57,914 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-21 22:17:57,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 22:17:57,914 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-21 22:17:57,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 22:17:57,915 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:57,915 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:57,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 22:17:57,916 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:57,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:57,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-21 22:17:57,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:57,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831456357] [2020-08-21 22:17:57,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:57,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:58,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:58,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:58,068 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:58,069 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831456357] [2020-08-21 22:17:58,069 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:17:58,069 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 22:17:58,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83601183] [2020-08-21 22:17:58,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 22:17:58,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:58,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 22:17:58,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 22:17:58,074 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-21 22:17:58,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:58,217 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-21 22:17:58,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 22:17:58,218 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 22:17:58,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:58,219 INFO L225 Difference]: With dead ends: 38 [2020-08-21 22:17:58,219 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 22:17:58,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:17:58,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 22:17:58,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-21 22:17:58,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 22:17:58,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-21 22:17:58,238 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-21 22:17:58,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:58,239 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-21 22:17:58,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 22:17:58,239 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-21 22:17:58,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 22:17:58,242 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:58,242 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:58,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 22:17:58,243 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:58,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:58,243 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-21 22:17:58,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:58,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1651651198] [2020-08-21 22:17:58,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:58,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:58,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:58,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:58,452 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:58,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1651651198] [2020-08-21 22:17:58,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:17:58,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 22:17:58,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84572454] [2020-08-21 22:17:58,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 22:17:58,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:58,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 22:17:58,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:17:58,457 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-21 22:17:58,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:58,558 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-21 22:17:58,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 22:17:58,559 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-21 22:17:58,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:58,560 INFO L225 Difference]: With dead ends: 42 [2020-08-21 22:17:58,560 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 22:17:58,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 22:17:58,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 22:17:58,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-21 22:17:58,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 22:17:58,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 22:17:58,567 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-21 22:17:58,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:58,567 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 22:17:58,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 22:17:58,567 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 22:17:58,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 22:17:58,568 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:58,568 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:58,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 22:17:58,569 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:58,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:58,569 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-21 22:17:58,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:58,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1394063297] [2020-08-21 22:17:58,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:58,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:58,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:58,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:58,692 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:58,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1394063297] [2020-08-21 22:17:58,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:17:58,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 22:17:58,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403302109] [2020-08-21 22:17:58,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 22:17:58,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:58,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 22:17:58,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 22:17:58,694 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-21 22:17:58,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:58,822 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-21 22:17:58,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 22:17:58,822 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-21 22:17:58,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:58,823 INFO L225 Difference]: With dead ends: 46 [2020-08-21 22:17:58,823 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 22:17:58,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:17:58,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 22:17:58,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-21 22:17:58,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 22:17:58,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-21 22:17:58,830 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-21 22:17:58,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:58,830 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-21 22:17:58,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 22:17:58,831 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-21 22:17:58,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 22:17:58,832 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:58,832 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:58,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 22:17:58,832 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:58,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:58,833 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-21 22:17:58,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:58,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403788719] [2020-08-21 22:17:58,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:58,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:58,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:58,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:58,977 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:58,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1403788719] [2020-08-21 22:17:58,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:17:58,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 22:17:58,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668648369] [2020-08-21 22:17:58,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 22:17:58,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:58,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 22:17:58,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:17:58,980 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-21 22:17:59,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:59,130 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-21 22:17:59,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 22:17:59,130 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-21 22:17:59,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:59,131 INFO L225 Difference]: With dead ends: 50 [2020-08-21 22:17:59,131 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 22:17:59,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 22:17:59,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 22:17:59,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 22:17:59,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 22:17:59,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-21 22:17:59,138 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-21 22:17:59,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:59,138 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-21 22:17:59,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 22:17:59,138 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-21 22:17:59,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 22:17:59,139 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:59,139 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:59,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 22:17:59,140 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:59,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:59,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-21 22:17:59,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:59,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [655293561] [2020-08-21 22:17:59,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:59,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:59,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:59,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:59,341 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:59,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [655293561] [2020-08-21 22:17:59,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:17:59,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 22:17:59,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061157804] [2020-08-21 22:17:59,344 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 22:17:59,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:59,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 22:17:59,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-21 22:17:59,345 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-21 22:17:59,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:59,543 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-21 22:17:59,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 22:17:59,544 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-21 22:17:59,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:59,545 INFO L225 Difference]: With dead ends: 54 [2020-08-21 22:17:59,545 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 22:17:59,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:17:59,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 22:17:59,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-21 22:17:59,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 22:17:59,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-21 22:17:59,552 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-21 22:17:59,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:59,552 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-21 22:17:59,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 22:17:59,553 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-21 22:17:59,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 22:17:59,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:59,554 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:59,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 22:17:59,554 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:59,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:59,555 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-21 22:17:59,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:59,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98300491] [2020-08-21 22:17:59,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:17:59,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:59,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:17:59,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:17:59,766 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:17:59,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98300491] [2020-08-21 22:17:59,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:17:59,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 22:17:59,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979944188] [2020-08-21 22:17:59,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 22:17:59,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:17:59,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 22:17:59,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:17:59,770 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-21 22:17:59,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:17:59,982 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-21 22:17:59,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 22:17:59,983 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-21 22:17:59,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:17:59,983 INFO L225 Difference]: With dead ends: 58 [2020-08-21 22:17:59,984 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 22:17:59,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-21 22:17:59,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 22:17:59,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-21 22:17:59,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 22:17:59,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-21 22:17:59,993 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-21 22:17:59,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:17:59,993 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-21 22:17:59,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 22:17:59,993 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-21 22:17:59,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 22:17:59,996 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:17:59,996 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:17:59,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 22:17:59,996 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:17:59,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:17:59,997 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-21 22:17:59,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:17:59,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013148536] [2020-08-21 22:17:59,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:00,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:00,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:00,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:00,235 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:00,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013148536] [2020-08-21 22:18:00,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:00,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 22:18:00,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596368438] [2020-08-21 22:18:00,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 22:18:00,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:00,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 22:18:00,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-21 22:18:00,237 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-21 22:18:00,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:00,468 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-21 22:18:00,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 22:18:00,469 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-21 22:18:00,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:00,469 INFO L225 Difference]: With dead ends: 62 [2020-08-21 22:18:00,469 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 22:18:00,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:18:00,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 22:18:00,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-21 22:18:00,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 22:18:00,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-21 22:18:00,477 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-21 22:18:00,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:00,477 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-21 22:18:00,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 22:18:00,478 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-21 22:18:00,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 22:18:00,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:00,478 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:00,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 22:18:00,479 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:00,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:00,479 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-21 22:18:00,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:00,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397780861] [2020-08-21 22:18:00,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:00,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:00,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:00,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:00,696 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:00,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397780861] [2020-08-21 22:18:00,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:00,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 22:18:00,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747966093] [2020-08-21 22:18:00,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 22:18:00,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:00,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 22:18:00,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:18:00,698 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-21 22:18:01,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:01,006 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-21 22:18:01,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 22:18:01,006 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-21 22:18:01,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:01,007 INFO L225 Difference]: With dead ends: 66 [2020-08-21 22:18:01,007 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 22:18:01,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-21 22:18:01,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 22:18:01,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-21 22:18:01,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 22:18:01,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-21 22:18:01,014 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-21 22:18:01,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:01,015 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-21 22:18:01,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 22:18:01,015 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-21 22:18:01,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 22:18:01,016 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:01,016 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:01,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 22:18:01,016 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:01,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:01,017 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-21 22:18:01,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:01,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836943744] [2020-08-21 22:18:01,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:01,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:01,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:01,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:01,246 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:01,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836943744] [2020-08-21 22:18:01,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:01,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 22:18:01,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226958964] [2020-08-21 22:18:01,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 22:18:01,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:01,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 22:18:01,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-21 22:18:01,249 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-21 22:18:01,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:01,555 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-21 22:18:01,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 22:18:01,556 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-21 22:18:01,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:01,556 INFO L225 Difference]: With dead ends: 70 [2020-08-21 22:18:01,557 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 22:18:01,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-21 22:18:01,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 22:18:01,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-21 22:18:01,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 22:18:01,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-21 22:18:01,564 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-21 22:18:01,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:01,564 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-21 22:18:01,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 22:18:01,564 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-21 22:18:01,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 22:18:01,565 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:01,565 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:01,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 22:18:01,566 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:01,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:01,566 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-21 22:18:01,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:01,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754203909] [2020-08-21 22:18:01,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:01,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:01,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:01,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:01,813 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:01,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754203909] [2020-08-21 22:18:01,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:01,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 22:18:01,814 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61461864] [2020-08-21 22:18:01,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 22:18:01,814 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:01,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 22:18:01,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-21 22:18:01,815 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-21 22:18:02,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:02,191 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-21 22:18:02,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 22:18:02,193 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-21 22:18:02,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:02,194 INFO L225 Difference]: With dead ends: 74 [2020-08-21 22:18:02,194 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 22:18:02,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-21 22:18:02,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 22:18:02,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-21 22:18:02,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 22:18:02,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-21 22:18:02,207 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-21 22:18:02,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:02,208 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-21 22:18:02,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 22:18:02,208 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-21 22:18:02,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 22:18:02,211 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:02,211 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:02,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 22:18:02,212 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:02,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:02,212 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-21 22:18:02,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:02,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1948221587] [2020-08-21 22:18:02,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:02,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:02,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:02,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:02,522 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:02,523 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1948221587] [2020-08-21 22:18:02,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:02,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 22:18:02,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937813735] [2020-08-21 22:18:02,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 22:18:02,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:02,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 22:18:02,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-21 22:18:02,525 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-21 22:18:02,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:02,946 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-21 22:18:02,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 22:18:02,947 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-21 22:18:02,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:02,948 INFO L225 Difference]: With dead ends: 78 [2020-08-21 22:18:02,948 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 22:18:02,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-21 22:18:02,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 22:18:02,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-21 22:18:02,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 22:18:02,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-21 22:18:02,955 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-21 22:18:02,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:02,956 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-21 22:18:02,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 22:18:02,956 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-21 22:18:02,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 22:18:02,956 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:02,957 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:02,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 22:18:02,957 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:02,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:02,958 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-21 22:18:02,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:02,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596305269] [2020-08-21 22:18:02,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:02,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:03,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:03,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:03,248 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:03,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596305269] [2020-08-21 22:18:03,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:03,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 22:18:03,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124868548] [2020-08-21 22:18:03,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 22:18:03,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:03,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 22:18:03,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-21 22:18:03,259 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-21 22:18:03,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:03,666 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-21 22:18:03,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 22:18:03,671 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-21 22:18:03,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:03,672 INFO L225 Difference]: With dead ends: 82 [2020-08-21 22:18:03,672 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 22:18:03,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-21 22:18:03,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 22:18:03,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-21 22:18:03,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 22:18:03,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-21 22:18:03,679 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-21 22:18:03,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:03,679 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-21 22:18:03,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 22:18:03,680 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-21 22:18:03,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 22:18:03,680 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:03,680 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:03,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 22:18:03,681 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:03,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:03,681 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-21 22:18:03,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:03,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170418737] [2020-08-21 22:18:03,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:03,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:03,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:03,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:03,996 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:03,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170418737] [2020-08-21 22:18:03,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:03,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 22:18:03,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033355093] [2020-08-21 22:18:03,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 22:18:03,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:03,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 22:18:03,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-21 22:18:03,999 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-21 22:18:04,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:04,593 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-21 22:18:04,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 22:18:04,593 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-21 22:18:04,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:04,594 INFO L225 Difference]: With dead ends: 86 [2020-08-21 22:18:04,594 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 22:18:04,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-21 22:18:04,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 22:18:04,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-21 22:18:04,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 22:18:04,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-21 22:18:04,608 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-21 22:18:04,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:04,608 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-21 22:18:04,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 22:18:04,608 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-21 22:18:04,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 22:18:04,610 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:04,610 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:04,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 22:18:04,610 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:04,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:04,610 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-21 22:18:04,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:04,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373803720] [2020-08-21 22:18:04,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:04,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:04,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:04,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:04,999 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:04,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373803720] [2020-08-21 22:18:04,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:05,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 22:18:05,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965549003] [2020-08-21 22:18:05,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 22:18:05,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:05,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 22:18:05,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-21 22:18:05,002 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-21 22:18:05,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:05,555 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-21 22:18:05,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 22:18:05,556 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-21 22:18:05,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:05,556 INFO L225 Difference]: With dead ends: 90 [2020-08-21 22:18:05,557 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 22:18:05,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-21 22:18:05,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 22:18:05,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-21 22:18:05,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 22:18:05,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-21 22:18:05,567 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-21 22:18:05,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:05,567 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-21 22:18:05,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 22:18:05,568 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-21 22:18:05,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 22:18:05,568 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:05,568 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:05,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 22:18:05,569 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:05,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:05,569 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-21 22:18:05,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:05,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [361055338] [2020-08-21 22:18:05,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:05,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:06,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:06,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:06,043 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:06,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [361055338] [2020-08-21 22:18:06,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:06,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 22:18:06,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963718043] [2020-08-21 22:18:06,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 22:18:06,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:06,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 22:18:06,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-21 22:18:06,046 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-21 22:18:06,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:06,688 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-21 22:18:06,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 22:18:06,689 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-21 22:18:06,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:06,690 INFO L225 Difference]: With dead ends: 94 [2020-08-21 22:18:06,690 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 22:18:06,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-21 22:18:06,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 22:18:06,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-21 22:18:06,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 22:18:06,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-21 22:18:06,696 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-21 22:18:06,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:06,697 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-21 22:18:06,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 22:18:06,697 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-21 22:18:06,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 22:18:06,697 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:06,698 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:06,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 22:18:06,698 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:06,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:06,698 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-21 22:18:06,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:06,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765816095] [2020-08-21 22:18:06,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:06,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:07,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:07,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:07,090 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:07,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765816095] [2020-08-21 22:18:07,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:07,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 22:18:07,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220328303] [2020-08-21 22:18:07,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 22:18:07,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:07,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 22:18:07,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-21 22:18:07,092 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-21 22:18:07,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:07,726 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-21 22:18:07,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 22:18:07,726 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-21 22:18:07,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:07,727 INFO L225 Difference]: With dead ends: 98 [2020-08-21 22:18:07,727 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 22:18:07,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-21 22:18:07,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 22:18:07,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-21 22:18:07,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 22:18:07,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-21 22:18:07,734 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-21 22:18:07,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:07,734 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-21 22:18:07,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 22:18:07,734 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-21 22:18:07,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 22:18:07,735 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:07,735 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:07,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 22:18:07,736 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:07,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:07,736 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-21 22:18:07,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:07,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079442170] [2020-08-21 22:18:07,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:07,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:08,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:08,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:08,203 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:08,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079442170] [2020-08-21 22:18:08,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:08,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 22:18:08,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819366238] [2020-08-21 22:18:08,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 22:18:08,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:08,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 22:18:08,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-21 22:18:08,206 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-21 22:18:08,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:08,849 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-21 22:18:08,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 22:18:08,855 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-21 22:18:08,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:08,856 INFO L225 Difference]: With dead ends: 102 [2020-08-21 22:18:08,856 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 22:18:08,857 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-21 22:18:08,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 22:18:08,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-21 22:18:08,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 22:18:08,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-21 22:18:08,867 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-21 22:18:08,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:08,867 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-21 22:18:08,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 22:18:08,868 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-21 22:18:08,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 22:18:08,868 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:08,868 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:08,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 22:18:08,869 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:08,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:08,869 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-21 22:18:08,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:08,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2001716676] [2020-08-21 22:18:08,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:08,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:09,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:09,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:09,375 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:09,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2001716676] [2020-08-21 22:18:09,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:09,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 22:18:09,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125245921] [2020-08-21 22:18:09,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 22:18:09,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:09,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 22:18:09,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-21 22:18:09,377 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-21 22:18:10,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:10,073 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-21 22:18:10,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 22:18:10,074 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-21 22:18:10,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:10,075 INFO L225 Difference]: With dead ends: 106 [2020-08-21 22:18:10,075 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 22:18:10,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-21 22:18:10,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 22:18:10,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-21 22:18:10,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 22:18:10,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-21 22:18:10,081 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-21 22:18:10,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:10,081 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-21 22:18:10,081 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 22:18:10,082 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-21 22:18:10,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 22:18:10,082 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:10,082 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:10,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 22:18:10,083 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:10,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:10,083 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-21 22:18:10,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:10,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1243479447] [2020-08-21 22:18:10,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:10,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:10,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:10,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:10,611 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:10,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1243479447] [2020-08-21 22:18:10,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:10,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 22:18:10,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919734057] [2020-08-21 22:18:10,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 22:18:10,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:10,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 22:18:10,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-21 22:18:10,613 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-21 22:18:11,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:11,397 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-21 22:18:11,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 22:18:11,398 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-21 22:18:11,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:11,400 INFO L225 Difference]: With dead ends: 110 [2020-08-21 22:18:11,400 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 22:18:11,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-21 22:18:11,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 22:18:11,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-21 22:18:11,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 22:18:11,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-21 22:18:11,417 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-21 22:18:11,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:11,418 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-21 22:18:11,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 22:18:11,418 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-21 22:18:11,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 22:18:11,419 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:11,419 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:11,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 22:18:11,420 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:11,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:11,420 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-21 22:18:11,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:11,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472299971] [2020-08-21 22:18:11,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:11,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:12,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:12,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:12,150 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:12,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472299971] [2020-08-21 22:18:12,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:12,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 22:18:12,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318822926] [2020-08-21 22:18:12,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 22:18:12,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:12,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 22:18:12,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-21 22:18:12,153 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-21 22:18:13,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:13,170 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-21 22:18:13,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 22:18:13,171 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-21 22:18:13,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:13,172 INFO L225 Difference]: With dead ends: 114 [2020-08-21 22:18:13,172 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 22:18:13,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-21 22:18:13,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 22:18:13,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-21 22:18:13,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 22:18:13,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-21 22:18:13,190 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-21 22:18:13,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:13,190 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-21 22:18:13,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 22:18:13,190 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-21 22:18:13,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-21 22:18:13,190 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:13,191 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:13,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 22:18:13,191 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:13,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:13,191 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-21 22:18:13,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:13,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1724323183] [2020-08-21 22:18:13,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:13,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:13,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:13,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:13,801 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:13,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1724323183] [2020-08-21 22:18:13,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:13,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 22:18:13,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857397437] [2020-08-21 22:18:13,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 22:18:13,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:13,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 22:18:13,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-21 22:18:13,803 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-21 22:18:14,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:14,718 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-21 22:18:14,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 22:18:14,719 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-21 22:18:14,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:14,719 INFO L225 Difference]: With dead ends: 118 [2020-08-21 22:18:14,720 INFO L226 Difference]: Without dead ends: 65 [2020-08-21 22:18:14,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-21 22:18:14,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-21 22:18:14,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-21 22:18:14,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-21 22:18:14,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-21 22:18:14,725 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-21 22:18:14,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:14,726 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-21 22:18:14,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 22:18:14,726 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-21 22:18:14,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 22:18:14,726 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:14,726 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:14,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 22:18:14,727 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:14,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:14,727 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-21 22:18:14,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:14,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167658144] [2020-08-21 22:18:14,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:14,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:15,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:15,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:15,335 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:15,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167658144] [2020-08-21 22:18:15,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:15,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 22:18:15,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983076801] [2020-08-21 22:18:15,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 22:18:15,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:15,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 22:18:15,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-21 22:18:15,338 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-21 22:18:16,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:16,465 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-21 22:18:16,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 22:18:16,469 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-21 22:18:16,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:16,470 INFO L225 Difference]: With dead ends: 122 [2020-08-21 22:18:16,470 INFO L226 Difference]: Without dead ends: 67 [2020-08-21 22:18:16,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-21 22:18:16,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-21 22:18:16,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-21 22:18:16,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 22:18:16,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-21 22:18:16,476 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-21 22:18:16,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:16,476 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-21 22:18:16,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 22:18:16,477 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-21 22:18:16,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 22:18:16,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:16,477 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:16,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 22:18:16,478 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:16,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:16,478 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-21 22:18:16,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:16,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1768298275] [2020-08-21 22:18:16,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:16,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:17,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:17,122 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:17,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1768298275] [2020-08-21 22:18:17,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:17,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 22:18:17,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126440282] [2020-08-21 22:18:17,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 22:18:17,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:17,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 22:18:17,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-21 22:18:17,124 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-21 22:18:18,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:18,241 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-21 22:18:18,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 22:18:18,247 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-21 22:18:18,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:18,248 INFO L225 Difference]: With dead ends: 126 [2020-08-21 22:18:18,248 INFO L226 Difference]: Without dead ends: 69 [2020-08-21 22:18:18,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-21 22:18:18,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-21 22:18:18,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-21 22:18:18,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-21 22:18:18,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-21 22:18:18,255 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-21 22:18:18,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:18,255 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-21 22:18:18,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 22:18:18,255 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-21 22:18:18,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-21 22:18:18,256 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:18,256 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:18,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 22:18:18,256 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:18,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:18,257 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-21 22:18:18,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:18,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [226378353] [2020-08-21 22:18:18,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:18,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:18,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:18,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:19,002 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:19,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [226378353] [2020-08-21 22:18:19,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:19,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 22:18:19,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205426988] [2020-08-21 22:18:19,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 22:18:19,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:19,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 22:18:19,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-21 22:18:19,004 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-21 22:18:20,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:20,201 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-21 22:18:20,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 22:18:20,204 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-21 22:18:20,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:20,205 INFO L225 Difference]: With dead ends: 130 [2020-08-21 22:18:20,205 INFO L226 Difference]: Without dead ends: 71 [2020-08-21 22:18:20,206 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-21 22:18:20,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-21 22:18:20,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-21 22:18:20,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-21 22:18:20,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-21 22:18:20,211 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-21 22:18:20,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:20,211 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-21 22:18:20,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 22:18:20,211 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-21 22:18:20,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 22:18:20,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:20,212 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:20,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 22:18:20,212 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:20,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:20,213 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-21 22:18:20,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:20,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364339939] [2020-08-21 22:18:20,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:20,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:20,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:21,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:21,014 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:21,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364339939] [2020-08-21 22:18:21,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:21,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 22:18:21,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094884661] [2020-08-21 22:18:21,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 22:18:21,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:21,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 22:18:21,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-21 22:18:21,017 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-21 22:18:22,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:22,308 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-21 22:18:22,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 22:18:22,310 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-21 22:18:22,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:22,311 INFO L225 Difference]: With dead ends: 134 [2020-08-21 22:18:22,311 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 22:18:22,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-21 22:18:22,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 22:18:22,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-21 22:18:22,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-21 22:18:22,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-21 22:18:22,317 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-21 22:18:22,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:22,317 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-21 22:18:22,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 22:18:22,317 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-21 22:18:22,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 22:18:22,318 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:22,318 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:22,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 22:18:22,319 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:22,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:22,319 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-21 22:18:22,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:22,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017061015] [2020-08-21 22:18:22,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:22,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:23,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:23,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:23,162 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:23,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017061015] [2020-08-21 22:18:23,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:23,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 22:18:23,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265096375] [2020-08-21 22:18:23,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 22:18:23,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:23,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 22:18:23,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-21 22:18:23,167 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-21 22:18:24,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:24,683 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-21 22:18:24,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 22:18:24,689 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-21 22:18:24,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:24,690 INFO L225 Difference]: With dead ends: 138 [2020-08-21 22:18:24,691 INFO L226 Difference]: Without dead ends: 75 [2020-08-21 22:18:24,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-21 22:18:24,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-21 22:18:24,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-21 22:18:24,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-21 22:18:24,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-21 22:18:24,698 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-21 22:18:24,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:24,699 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-21 22:18:24,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 22:18:24,699 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-21 22:18:24,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-21 22:18:24,700 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:24,700 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:24,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 22:18:24,700 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:24,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:24,701 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-21 22:18:24,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:24,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817099518] [2020-08-21 22:18:24,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:24,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:25,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:25,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:25,627 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:25,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817099518] [2020-08-21 22:18:25,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:25,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 22:18:25,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876255590] [2020-08-21 22:18:25,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 22:18:25,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:25,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 22:18:25,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-21 22:18:25,629 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-21 22:18:27,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:27,191 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-21 22:18:27,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 22:18:27,192 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-21 22:18:27,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:27,193 INFO L225 Difference]: With dead ends: 142 [2020-08-21 22:18:27,194 INFO L226 Difference]: Without dead ends: 77 [2020-08-21 22:18:27,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 22:18:27,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-21 22:18:27,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-21 22:18:27,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-21 22:18:27,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-21 22:18:27,200 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-21 22:18:27,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:27,201 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-21 22:18:27,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 22:18:27,201 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-21 22:18:27,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 22:18:27,202 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:27,202 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:27,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 22:18:27,202 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:27,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:27,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-21 22:18:27,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:27,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [91304963] [2020-08-21 22:18:27,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:27,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:28,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:28,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:28,163 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:28,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [91304963] [2020-08-21 22:18:28,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:28,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 22:18:28,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102288715] [2020-08-21 22:18:28,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 22:18:28,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:28,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 22:18:28,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 22:18:28,167 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-21 22:18:30,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:30,455 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-21 22:18:30,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 22:18:30,455 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-21 22:18:30,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:30,456 INFO L225 Difference]: With dead ends: 146 [2020-08-21 22:18:30,456 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 22:18:30,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 22:18:30,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 22:18:30,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-21 22:18:30,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-21 22:18:30,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-21 22:18:30,463 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-21 22:18:30,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:30,463 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-21 22:18:30,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 22:18:30,463 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-21 22:18:30,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 22:18:30,464 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:30,464 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:30,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 22:18:30,464 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:30,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:30,465 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-21 22:18:30,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:30,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244080099] [2020-08-21 22:18:30,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:30,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:31,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:31,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:31,451 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:31,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244080099] [2020-08-21 22:18:31,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:31,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 22:18:31,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114538335] [2020-08-21 22:18:31,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 22:18:31,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:31,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 22:18:31,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 22:18:31,453 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-21 22:18:33,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:33,206 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-21 22:18:33,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 22:18:33,206 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-21 22:18:33,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:33,208 INFO L225 Difference]: With dead ends: 150 [2020-08-21 22:18:33,208 INFO L226 Difference]: Without dead ends: 81 [2020-08-21 22:18:33,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 22:18:33,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-21 22:18:33,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-21 22:18:33,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-21 22:18:33,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-21 22:18:33,215 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-21 22:18:33,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:33,215 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-21 22:18:33,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 22:18:33,215 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-21 22:18:33,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-21 22:18:33,216 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:33,216 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:33,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 22:18:33,217 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:33,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:33,217 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-21 22:18:33,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:33,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505257991] [2020-08-21 22:18:33,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:33,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:34,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:34,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:34,283 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:34,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505257991] [2020-08-21 22:18:34,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:34,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 22:18:34,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062395287] [2020-08-21 22:18:34,285 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 22:18:34,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:34,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 22:18:34,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 22:18:34,288 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-21 22:18:36,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:36,154 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-21 22:18:36,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 22:18:36,155 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-21 22:18:36,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:36,156 INFO L225 Difference]: With dead ends: 154 [2020-08-21 22:18:36,156 INFO L226 Difference]: Without dead ends: 83 [2020-08-21 22:18:36,157 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 22:18:36,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-21 22:18:36,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-21 22:18:36,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-21 22:18:36,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-21 22:18:36,165 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-21 22:18:36,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:36,165 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-21 22:18:36,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 22:18:36,165 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-21 22:18:36,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 22:18:36,165 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:36,166 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:36,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 22:18:36,166 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:36,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:36,166 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-21 22:18:36,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:36,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [928791088] [2020-08-21 22:18:36,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:36,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:37,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:37,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:37,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:37,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [928791088] [2020-08-21 22:18:37,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:37,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 22:18:37,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770962490] [2020-08-21 22:18:37,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 22:18:37,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:37,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 22:18:37,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 22:18:37,268 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-21 22:18:39,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:39,171 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-21 22:18:39,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 22:18:39,172 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-21 22:18:39,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:39,174 INFO L225 Difference]: With dead ends: 158 [2020-08-21 22:18:39,174 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 22:18:39,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 22:18:39,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 22:18:39,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-21 22:18:39,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 22:18:39,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-21 22:18:39,181 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-21 22:18:39,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:39,181 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-21 22:18:39,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 22:18:39,181 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-21 22:18:39,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 22:18:39,182 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:39,182 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:39,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 22:18:39,183 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:39,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:39,183 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-21 22:18:39,183 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:39,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2061079206] [2020-08-21 22:18:39,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:39,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:40,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:40,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:40,320 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:40,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2061079206] [2020-08-21 22:18:40,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:40,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 22:18:40,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566201562] [2020-08-21 22:18:40,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 22:18:40,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:40,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 22:18:40,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 22:18:40,322 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-21 22:18:42,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:42,310 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-21 22:18:42,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 22:18:42,312 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-21 22:18:42,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:42,313 INFO L225 Difference]: With dead ends: 162 [2020-08-21 22:18:42,313 INFO L226 Difference]: Without dead ends: 87 [2020-08-21 22:18:42,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 22:18:42,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-21 22:18:42,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-21 22:18:42,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-21 22:18:42,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-21 22:18:42,319 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-21 22:18:42,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:42,320 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-21 22:18:42,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 22:18:42,320 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-21 22:18:42,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-21 22:18:42,320 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:42,320 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:42,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 22:18:42,321 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:42,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:42,321 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-21 22:18:42,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:42,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1325420840] [2020-08-21 22:18:42,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:42,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:43,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:43,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:43,565 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:43,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1325420840] [2020-08-21 22:18:43,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:43,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 22:18:43,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248108283] [2020-08-21 22:18:43,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 22:18:43,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:43,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 22:18:43,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 22:18:43,567 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-21 22:18:45,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:45,653 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-21 22:18:45,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 22:18:45,656 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-21 22:18:45,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:45,657 INFO L225 Difference]: With dead ends: 166 [2020-08-21 22:18:45,657 INFO L226 Difference]: Without dead ends: 89 [2020-08-21 22:18:45,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 22:18:45,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-21 22:18:45,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-21 22:18:45,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-21 22:18:45,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-21 22:18:45,663 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-21 22:18:45,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:45,664 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-21 22:18:45,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 22:18:45,664 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-21 22:18:45,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-21 22:18:45,664 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:45,665 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:45,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 22:18:45,665 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:45,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:45,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-21 22:18:45,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:45,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960150664] [2020-08-21 22:18:45,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:45,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:46,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:46,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:46,997 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:46,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960150664] [2020-08-21 22:18:46,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:46,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 22:18:46,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966478310] [2020-08-21 22:18:46,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 22:18:46,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:46,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 22:18:46,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 22:18:46,999 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-21 22:18:49,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:49,187 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-21 22:18:49,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 22:18:49,187 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-21 22:18:49,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:49,189 INFO L225 Difference]: With dead ends: 170 [2020-08-21 22:18:49,189 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 22:18:49,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 22:18:49,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 22:18:49,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-21 22:18:49,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 22:18:49,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-21 22:18:49,202 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-21 22:18:49,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:49,202 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-21 22:18:49,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 22:18:49,202 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-21 22:18:49,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 22:18:49,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:49,203 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:49,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 22:18:49,204 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:49,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:49,204 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-21 22:18:49,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:49,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1552084519] [2020-08-21 22:18:49,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:49,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:50,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:50,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:50,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:50,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1552084519] [2020-08-21 22:18:50,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:50,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 22:18:50,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420020596] [2020-08-21 22:18:50,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 22:18:50,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:50,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 22:18:50,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 22:18:50,566 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-21 22:18:52,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:18:52,902 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-21 22:18:52,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 22:18:52,908 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-21 22:18:52,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:18:52,909 INFO L225 Difference]: With dead ends: 174 [2020-08-21 22:18:52,909 INFO L226 Difference]: Without dead ends: 93 [2020-08-21 22:18:52,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 22:18:52,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-21 22:18:52,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-21 22:18:52,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-21 22:18:52,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-21 22:18:52,921 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-21 22:18:52,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:18:52,922 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-21 22:18:52,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 22:18:52,929 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-21 22:18:52,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-21 22:18:52,930 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:18:52,930 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:18:52,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 22:18:52,930 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:18:52,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:18:52,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-21 22:18:52,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:18:52,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1417202631] [2020-08-21 22:18:52,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:18:52,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:54,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:18:54,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:18:54,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 22:18:54,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1417202631] [2020-08-21 22:18:54,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:18:54,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 22:18:54,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749373054] [2020-08-21 22:18:54,404 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 22:18:54,404 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:18:54,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 22:18:54,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 22:18:54,405 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.