/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 --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/loopv2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-13 10:57:39,726 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-13 10:57:39,729 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-13 10:57:39,751 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-13 10:57:39,752 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-13 10:57:39,753 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-13 10:57:39,754 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-13 10:57:39,756 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-13 10:57:39,758 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-13 10:57:39,758 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-13 10:57:39,759 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-13 10:57:39,760 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-13 10:57:39,761 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-13 10:57:39,762 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-13 10:57:39,763 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-13 10:57:39,764 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-13 10:57:39,766 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-13 10:57:39,767 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-13 10:57:39,769 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-13 10:57:39,771 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-13 10:57:39,772 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-13 10:57:39,779 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-13 10:57:39,782 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-13 10:57:39,782 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-13 10:57:39,785 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-13 10:57:39,785 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-13 10:57:39,785 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-13 10:57:39,786 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-13 10:57:39,787 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-13 10:57:39,787 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-13 10:57:39,788 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-13 10:57:39,788 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-13 10:57:39,789 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-13 10:57:39,790 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-13 10:57:39,791 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-13 10:57:39,791 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-13 10:57:39,792 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-13 10:57:39,792 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-13 10:57:39,792 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-13 10:57:39,793 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-13 10:57:39,794 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-13 10:57:39,795 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 [2020-10-13 10:57:39,816 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-13 10:57:39,816 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-13 10:57:39,818 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-13 10:57:39,818 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-13 10:57:39,818 INFO L138 SettingsManager]: * Use SBE=true [2020-10-13 10:57:39,818 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-13 10:57:39,818 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-13 10:57:39,819 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-13 10:57:39,819 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-13 10:57:39,819 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-13 10:57:39,819 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-13 10:57:39,819 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-13 10:57:39,820 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-13 10:57:39,820 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-13 10:57:39,820 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-13 10:57:39,820 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-13 10:57:39,820 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-13 10:57:39,821 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-13 10:57:39,821 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-13 10:57:39,821 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-13 10:57:39,821 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-13 10:57:39,821 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-13 10:57:39,822 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-13 10:57:39,822 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-13 10:57:39,822 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-13 10:57:39,822 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-13 10:57:39,822 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-13 10:57:39,822 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-13 10:57:39,823 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-13 10:57:39,823 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.rcfgbuilder: Size of a code block -> SequenceOfStatements 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 -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; [2020-10-13 10:57:40,134 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-13 10:57:40,147 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-13 10:57:40,150 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-13 10:57:40,152 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-13 10:57:40,152 INFO L275 PluginConnector]: CDTParser initialized [2020-10-13 10:57:40,153 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/loopv2.c [2020-10-13 10:57:40,213 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/91d0db244/7e60b99040c248988bf0860166822766/FLAG7c32a0584 [2020-10-13 10:57:40,665 INFO L306 CDTParser]: Found 1 translation units. [2020-10-13 10:57:40,666 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops-crafted-1/loopv2.c [2020-10-13 10:57:40,672 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/91d0db244/7e60b99040c248988bf0860166822766/FLAG7c32a0584 [2020-10-13 10:57:41,003 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/91d0db244/7e60b99040c248988bf0860166822766 [2020-10-13 10:57:41,016 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-13 10:57:41,018 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-13 10:57:41,020 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-13 10:57:41,020 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-13 10:57:41,023 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-13 10:57:41,024 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 10:57:41" (1/1) ... [2020-10-13 10:57:41,028 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f1c8c30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:57:41, skipping insertion in model container [2020-10-13 10:57:41,028 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 10:57:41" (1/1) ... [2020-10-13 10:57:41,037 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-13 10:57:41,060 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-13 10:57:41,270 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 10:57:41,276 INFO L203 MainTranslator]: Completed pre-run [2020-10-13 10:57:41,294 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 10:57:41,309 INFO L208 MainTranslator]: Completed translation [2020-10-13 10:57:41,309 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:57:41 WrapperNode [2020-10-13 10:57:41,309 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-13 10:57:41,310 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-13 10:57:41,310 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-13 10:57:41,311 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-13 10:57:41,323 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:57:41" (1/1) ... [2020-10-13 10:57:41,323 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:57:41" (1/1) ... [2020-10-13 10:57:41,412 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:57:41" (1/1) ... [2020-10-13 10:57:41,412 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:57:41" (1/1) ... [2020-10-13 10:57:41,418 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:57:41" (1/1) ... [2020-10-13 10:57:41,423 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:57:41" (1/1) ... [2020-10-13 10:57:41,424 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:57:41" (1/1) ... [2020-10-13 10:57:41,426 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-13 10:57:41,426 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-13 10:57:41,426 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-13 10:57:41,426 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-13 10:57:41,427 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:57:41" (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 [2020-10-13 10:57:41,487 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-13 10:57:41,487 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-13 10:57:41,487 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-13 10:57:41,488 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-13 10:57:41,488 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-13 10:57:41,488 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-13 10:57:41,489 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-13 10:57:41,489 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-13 10:57:41,489 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-13 10:57:41,489 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-13 10:57:41,489 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-13 10:57:41,489 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-13 10:57:41,489 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-13 10:57:41,675 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-13 10:57:41,675 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-10-13 10:57:41,679 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 10:57:41 BoogieIcfgContainer [2020-10-13 10:57:41,679 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-13 10:57:41,680 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-13 10:57:41,680 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-13 10:57:41,683 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-13 10:57:41,684 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 10:57:41" (1/3) ... [2020-10-13 10:57:41,684 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@352367cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 10:57:41, skipping insertion in model container [2020-10-13 10:57:41,685 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:57:41" (2/3) ... [2020-10-13 10:57:41,685 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@352367cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 10:57:41, skipping insertion in model container [2020-10-13 10:57:41,685 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 10:57:41" (3/3) ... [2020-10-13 10:57:41,687 INFO L109 eAbstractionObserver]: Analyzing ICFG loopv2.c [2020-10-13 10:57:41,697 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-13 10:57:41,704 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-13 10:57:41,718 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-13 10:57:41,740 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-13 10:57:41,741 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-13 10:57:41,741 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-13 10:57:41,741 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-13 10:57:41,741 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-13 10:57:41,741 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-13 10:57:41,741 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-13 10:57:41,742 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-13 10:57:41,760 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-10-13 10:57:41,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-10-13 10:57:41,766 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:41,767 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:41,767 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:41,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:41,772 INFO L82 PathProgramCache]: Analyzing trace with hash 1292298132, now seen corresponding path program 1 times [2020-10-13 10:57:41,779 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:41,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1062076149] [2020-10-13 10:57:41,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:41,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:41,908 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:42,002 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:42,150 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:42,150 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-10-13 10:57:42,150 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:42,151 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 265 [2020-10-13 10:57:42,155 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:42,156 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:57:42,156 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:42,158 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-13 10:57:42,158 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 7 [2020-10-13 10:57:42,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:42,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:42,306 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:42,309 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:42,310 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:42,310 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:42,310 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-13 10:57:42,311 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:42,311 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:42,311 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:42,312 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:42,312 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:57:42,319 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:42,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1062076149] [2020-10-13 10:57:42,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 10:57:42,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-13 10:57:42,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616368485] [2020-10-13 10:57:42,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-13 10:57:42,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:42,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-13 10:57:42,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 10:57:42,382 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2020-10-13 10:57:42,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:42,525 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2020-10-13 10:57:42,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-13 10:57:42,527 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2020-10-13 10:57:42,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:42,536 INFO L225 Difference]: With dead ends: 39 [2020-10-13 10:57:42,537 INFO L226 Difference]: Without dead ends: 18 [2020-10-13 10:57:42,540 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 [2020-10-13 10:57:42,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-10-13 10:57:42,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-10-13 10:57:42,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-10-13 10:57:42,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-10-13 10:57:42,583 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2020-10-13 10:57:42,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:42,583 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-10-13 10:57:42,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-13 10:57:42,584 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-10-13 10:57:42,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-13 10:57:42,585 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:42,585 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:42,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-13 10:57:42,586 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:42,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:42,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1442074197, now seen corresponding path program 1 times [2020-10-13 10:57:42,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:42,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1750348162] [2020-10-13 10:57:42,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:42,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:42,619 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:42,744 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:42,815 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:42,815 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-13 10:57:42,815 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:42,816 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 208 [2020-10-13 10:57:42,816 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:42,816 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:57:42,816 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-13 10:57:42,817 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 10:57:42,817 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:42,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:42,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:42,855 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:42,857 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:42,857 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:42,857 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:42,858 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-13 10:57:42,858 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:42,858 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:42,859 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:42,859 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:42,859 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:57:42,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:42,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1750348162] [2020-10-13 10:57:42,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 10:57:42,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-13 10:57:42,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387696017] [2020-10-13 10:57:42,866 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-13 10:57:42,866 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:42,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-13 10:57:42,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 10:57:42,867 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2020-10-13 10:57:42,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:42,919 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-10-13 10:57:42,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-13 10:57:42,920 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-10-13 10:57:42,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:42,921 INFO L225 Difference]: With dead ends: 24 [2020-10-13 10:57:42,921 INFO L226 Difference]: Without dead ends: 16 [2020-10-13 10:57:42,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-13 10:57:42,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-10-13 10:57:42,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-10-13 10:57:42,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-10-13 10:57:42,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-10-13 10:57:42,931 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 15 [2020-10-13 10:57:42,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:42,931 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-10-13 10:57:42,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-13 10:57:42,931 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-10-13 10:57:42,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-13 10:57:42,932 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:42,932 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:42,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-13 10:57:42,933 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:42,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:42,934 INFO L82 PathProgramCache]: Analyzing trace with hash -654989578, now seen corresponding path program 1 times [2020-10-13 10:57:42,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:42,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [428892972] [2020-10-13 10:57:42,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:42,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:42,954 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:42,981 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:43,150 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:43,151 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-13 10:57:43,151 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:43,151 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 203 [2020-10-13 10:57:43,152 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:43,152 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-13 10:57:43,152 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:43,152 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-13 10:57:43,152 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:43,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:43,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:43,252 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:43,254 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:43,254 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:43,255 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:43,255 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 10:57:43,255 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:43,256 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:43,256 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:43,256 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:43,256 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:57:43,259 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:43,260 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [428892972] [2020-10-13 10:57:43,260 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:43,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 10:57:43,261 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302317851] [2020-10-13 10:57:43,261 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 10:57:43,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:43,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 10:57:43,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-13 10:57:43,262 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2020-10-13 10:57:43,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:43,335 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-10-13 10:57:43,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 10:57:43,336 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-10-13 10:57:43,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:43,337 INFO L225 Difference]: With dead ends: 24 [2020-10-13 10:57:43,337 INFO L226 Difference]: Without dead ends: 17 [2020-10-13 10:57:43,338 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-10-13 10:57:43,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-10-13 10:57:43,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-10-13 10:57:43,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-10-13 10:57:43,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-10-13 10:57:43,343 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-10-13 10:57:43,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:43,344 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-10-13 10:57:43,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 10:57:43,344 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-10-13 10:57:43,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-13 10:57:43,345 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:43,345 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:43,345 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-13 10:57:43,346 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:43,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:43,346 INFO L82 PathProgramCache]: Analyzing trace with hash -891366444, now seen corresponding path program 2 times [2020-10-13 10:57:43,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:43,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1256249222] [2020-10-13 10:57:43,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:43,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:43,363 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:43,405 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:43,470 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:43,470 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-10-13 10:57:43,470 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:43,471 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 113 [2020-10-13 10:57:43,471 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:43,471 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 10:57:43,471 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:43,472 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-13 10:57:43,472 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:43,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:43,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:43,565 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:43,566 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:43,567 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:43,567 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:43,567 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 10:57:43,567 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:43,568 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:43,568 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:43,568 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:43,568 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:43,570 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:43,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1256249222] [2020-10-13 10:57:43,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:43,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-13 10:57:43,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040850151] [2020-10-13 10:57:43,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-13 10:57:43,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:43,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-13 10:57:43,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-13 10:57:43,573 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-10-13 10:57:43,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:43,658 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-10-13 10:57:43,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-13 10:57:43,658 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-10-13 10:57:43,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:43,659 INFO L225 Difference]: With dead ends: 25 [2020-10-13 10:57:43,659 INFO L226 Difference]: Without dead ends: 18 [2020-10-13 10:57:43,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-10-13 10:57:43,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-10-13 10:57:43,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-10-13 10:57:43,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-10-13 10:57:43,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-10-13 10:57:43,665 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-10-13 10:57:43,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:43,665 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-10-13 10:57:43,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-13 10:57:43,666 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-10-13 10:57:43,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-13 10:57:43,666 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:43,667 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:43,667 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-13 10:57:43,667 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:43,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:43,668 INFO L82 PathProgramCache]: Analyzing trace with hash 370885302, now seen corresponding path program 3 times [2020-10-13 10:57:43,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:43,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127790565] [2020-10-13 10:57:43,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:43,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:43,682 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:43,716 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:43,788 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:43,788 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-10-13 10:57:43,789 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:43,789 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 111 [2020-10-13 10:57:43,789 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:43,790 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-13 10:57:43,790 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:43,790 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-13 10:57:43,790 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:57:43,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:43,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:43,886 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:43,887 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:43,888 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:43,888 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:43,888 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:43,889 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:43,889 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:43,889 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:43,889 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:43,890 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:57:43,892 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:43,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127790565] [2020-10-13 10:57:43,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:43,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-13 10:57:43,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497285770] [2020-10-13 10:57:43,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-13 10:57:43,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:43,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-13 10:57:43,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-10-13 10:57:43,895 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 7 states. [2020-10-13 10:57:44,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:44,016 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-10-13 10:57:44,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-13 10:57:44,017 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-10-13 10:57:44,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:44,017 INFO L225 Difference]: With dead ends: 26 [2020-10-13 10:57:44,018 INFO L226 Difference]: Without dead ends: 19 [2020-10-13 10:57:44,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-10-13 10:57:44,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-10-13 10:57:44,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-10-13 10:57:44,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-10-13 10:57:44,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-10-13 10:57:44,023 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-10-13 10:57:44,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:44,024 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-10-13 10:57:44,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-13 10:57:44,024 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-10-13 10:57:44,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-13 10:57:44,025 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:44,025 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:44,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-13 10:57:44,025 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:44,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:44,026 INFO L82 PathProgramCache]: Analyzing trace with hash 845983764, now seen corresponding path program 4 times [2020-10-13 10:57:44,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:44,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1494746739] [2020-10-13 10:57:44,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:44,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:44,040 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:44,067 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:44,191 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:44,191 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 26 [2020-10-13 10:57:44,191 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:44,191 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 156 [2020-10-13 10:57:44,192 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:44,192 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 10:57:44,192 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:44,192 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-13 10:57:44,192 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:44,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:44,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:44,312 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:44,314 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:44,314 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:44,314 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:44,315 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:44,315 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:44,315 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:44,315 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:44,316 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:44,316 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:57:44,318 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:44,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1494746739] [2020-10-13 10:57:44,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:44,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-13 10:57:44,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906622110] [2020-10-13 10:57:44,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-13 10:57:44,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:44,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-13 10:57:44,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-13 10:57:44,324 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 8 states. [2020-10-13 10:57:44,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:44,451 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-10-13 10:57:44,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-13 10:57:44,452 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-10-13 10:57:44,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:44,453 INFO L225 Difference]: With dead ends: 27 [2020-10-13 10:57:44,453 INFO L226 Difference]: Without dead ends: 20 [2020-10-13 10:57:44,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-10-13 10:57:44,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-10-13 10:57:44,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-10-13 10:57:44,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-10-13 10:57:44,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-10-13 10:57:44,462 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-10-13 10:57:44,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:44,462 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-10-13 10:57:44,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-13 10:57:44,463 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-10-13 10:57:44,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-13 10:57:44,463 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:44,464 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:44,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-13 10:57:44,467 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:44,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:44,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1605833098, now seen corresponding path program 5 times [2020-10-13 10:57:44,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:44,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531184348] [2020-10-13 10:57:44,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:44,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:44,491 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:44,538 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:44,699 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:44,700 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-10-13 10:57:44,700 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:44,700 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 214 [2020-10-13 10:57:44,700 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:44,701 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-10-13 10:57:44,701 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:44,701 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-10-13 10:57:44,701 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:44,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:44,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:44,856 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:44,857 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:44,857 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:44,857 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:44,858 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:44,859 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:44,859 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:44,859 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:44,860 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:44,860 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:44,862 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:44,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531184348] [2020-10-13 10:57:44,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:44,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-10-13 10:57:44,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122112695] [2020-10-13 10:57:44,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-13 10:57:44,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:44,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-13 10:57:44,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-10-13 10:57:44,865 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-10-13 10:57:45,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:45,016 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-10-13 10:57:45,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-13 10:57:45,016 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-10-13 10:57:45,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:45,017 INFO L225 Difference]: With dead ends: 28 [2020-10-13 10:57:45,017 INFO L226 Difference]: Without dead ends: 21 [2020-10-13 10:57:45,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-10-13 10:57:45,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-10-13 10:57:45,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-10-13 10:57:45,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-10-13 10:57:45,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-10-13 10:57:45,023 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-10-13 10:57:45,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:45,023 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-10-13 10:57:45,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-13 10:57:45,024 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-10-13 10:57:45,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-13 10:57:45,025 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:45,025 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:45,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-13 10:57:45,025 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:45,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:45,026 INFO L82 PathProgramCache]: Analyzing trace with hash -302744492, now seen corresponding path program 6 times [2020-10-13 10:57:45,026 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:45,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [852947211] [2020-10-13 10:57:45,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:45,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:45,041 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:45,145 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:45,167 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:45,168 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-10-13 10:57:45,168 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:45,168 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 132 [2020-10-13 10:57:45,168 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:45,169 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-13 10:57:45,169 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:45,169 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-13 10:57:45,169 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:45,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:45,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:45,287 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:45,288 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:45,288 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:45,289 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:45,289 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:45,289 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:45,289 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:45,290 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:45,290 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:45,290 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:45,292 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:45,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [852947211] [2020-10-13 10:57:45,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:45,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-13 10:57:45,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57197590] [2020-10-13 10:57:45,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-13 10:57:45,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:45,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-13 10:57:45,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-10-13 10:57:45,294 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 10 states. [2020-10-13 10:57:45,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:45,459 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-10-13 10:57:45,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-13 10:57:45,460 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2020-10-13 10:57:45,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:45,461 INFO L225 Difference]: With dead ends: 29 [2020-10-13 10:57:45,461 INFO L226 Difference]: Without dead ends: 22 [2020-10-13 10:57:45,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-10-13 10:57:45,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-10-13 10:57:45,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-10-13 10:57:45,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-10-13 10:57:45,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-10-13 10:57:45,466 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-10-13 10:57:45,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:45,467 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-10-13 10:57:45,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-13 10:57:45,467 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-10-13 10:57:45,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-13 10:57:45,468 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:45,468 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:45,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-13 10:57:45,469 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:45,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:45,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1438296630, now seen corresponding path program 7 times [2020-10-13 10:57:45,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:45,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249366913] [2020-10-13 10:57:45,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:45,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:45,501 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:45,552 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:45,693 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:45,694 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 29 [2020-10-13 10:57:45,694 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:45,694 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 198 [2020-10-13 10:57:45,695 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:45,695 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-13 10:57:45,695 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:45,695 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-10-13 10:57:45,695 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:45,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:45,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:45,839 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:45,840 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:45,840 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:45,840 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:45,840 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:45,840 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:45,841 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:45,841 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:45,841 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:45,841 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:45,843 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:45,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249366913] [2020-10-13 10:57:45,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:45,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-13 10:57:45,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579889966] [2020-10-13 10:57:45,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-13 10:57:45,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:45,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-13 10:57:45,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-10-13 10:57:45,846 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 11 states. [2020-10-13 10:57:46,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:46,034 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-10-13 10:57:46,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-13 10:57:46,035 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 21 [2020-10-13 10:57:46,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:46,036 INFO L225 Difference]: With dead ends: 30 [2020-10-13 10:57:46,036 INFO L226 Difference]: Without dead ends: 23 [2020-10-13 10:57:46,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-10-13 10:57:46,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-10-13 10:57:46,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-10-13 10:57:46,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-13 10:57:46,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-10-13 10:57:46,042 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-10-13 10:57:46,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:46,042 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-10-13 10:57:46,042 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-13 10:57:46,043 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-10-13 10:57:46,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-13 10:57:46,043 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:46,043 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:46,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-13 10:57:46,044 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:46,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:46,045 INFO L82 PathProgramCache]: Analyzing trace with hash -424003436, now seen corresponding path program 8 times [2020-10-13 10:57:46,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:46,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1545584873] [2020-10-13 10:57:46,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:46,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:46,062 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:46,135 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:46,285 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:46,285 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 30 [2020-10-13 10:57:46,285 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:46,286 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 228 [2020-10-13 10:57:46,286 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:46,286 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-13 10:57:46,286 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:46,287 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-10-13 10:57:46,287 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:46,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:46,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:46,448 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:46,449 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:46,450 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:46,450 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:46,450 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 10:57:46,450 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:46,450 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:46,451 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:46,451 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:46,451 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:46,453 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:46,454 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1545584873] [2020-10-13 10:57:46,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:46,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-13 10:57:46,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99352935] [2020-10-13 10:57:46,455 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-13 10:57:46,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:46,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-13 10:57:46,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-10-13 10:57:46,456 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 12 states. [2020-10-13 10:57:46,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:46,715 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-10-13 10:57:46,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-13 10:57:46,716 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-10-13 10:57:46,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:46,717 INFO L225 Difference]: With dead ends: 31 [2020-10-13 10:57:46,717 INFO L226 Difference]: Without dead ends: 24 [2020-10-13 10:57:46,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-10-13 10:57:46,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-13 10:57:46,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-10-13 10:57:46,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-10-13 10:57:46,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-10-13 10:57:46,723 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-10-13 10:57:46,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:46,723 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-10-13 10:57:46,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-13 10:57:46,724 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-10-13 10:57:46,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-13 10:57:46,724 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:46,725 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:46,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-13 10:57:46,725 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:46,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:46,726 INFO L82 PathProgramCache]: Analyzing trace with hash 1974236662, now seen corresponding path program 9 times [2020-10-13 10:57:46,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:46,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170278747] [2020-10-13 10:57:46,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:46,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:46,745 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:46,898 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:46,925 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:46,925 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 31 [2020-10-13 10:57:46,925 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:46,925 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 186 [2020-10-13 10:57:46,926 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:46,926 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 11 [2020-10-13 10:57:46,926 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:46,926 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 13 [2020-10-13 10:57:46,926 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:47,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:47,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:47,101 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:47,104 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:47,104 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:47,105 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:47,105 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 10:57:47,105 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:47,105 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:47,106 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:47,106 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:47,106 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:47,110 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:47,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170278747] [2020-10-13 10:57:47,111 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:47,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-10-13 10:57:47,111 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176783447] [2020-10-13 10:57:47,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-13 10:57:47,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:47,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-13 10:57:47,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-10-13 10:57:47,113 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 13 states. [2020-10-13 10:57:47,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:47,371 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-10-13 10:57:47,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-13 10:57:47,372 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 23 [2020-10-13 10:57:47,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:47,373 INFO L225 Difference]: With dead ends: 32 [2020-10-13 10:57:47,373 INFO L226 Difference]: Without dead ends: 25 [2020-10-13 10:57:47,374 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-10-13 10:57:47,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-10-13 10:57:47,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-10-13 10:57:47,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-10-13 10:57:47,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-10-13 10:57:47,378 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-10-13 10:57:47,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:47,379 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-10-13 10:57:47,379 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-13 10:57:47,379 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-10-13 10:57:47,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-13 10:57:47,379 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:47,380 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:47,380 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-13 10:57:47,380 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:47,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:47,380 INFO L82 PathProgramCache]: Analyzing trace with hash -989731628, now seen corresponding path program 10 times [2020-10-13 10:57:47,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:47,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [920522553] [2020-10-13 10:57:47,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:47,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:47,401 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:47,472 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:47,779 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:47,779 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 32 [2020-10-13 10:57:47,779 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:47,779 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 385 [2020-10-13 10:57:47,780 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:47,780 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-10-13 10:57:47,780 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:47,780 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 14 [2020-10-13 10:57:47,780 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:47,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:47,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:47,953 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:47,954 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:47,954 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:47,955 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:47,955 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:47,955 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:47,955 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:47,955 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:47,955 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:47,956 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:47,958 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:47,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [920522553] [2020-10-13 10:57:47,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:47,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-10-13 10:57:47,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077993511] [2020-10-13 10:57:47,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-13 10:57:47,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:47,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-13 10:57:47,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-10-13 10:57:47,960 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 14 states. [2020-10-13 10:57:48,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:48,260 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-10-13 10:57:48,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-13 10:57:48,261 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 24 [2020-10-13 10:57:48,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:48,261 INFO L225 Difference]: With dead ends: 33 [2020-10-13 10:57:48,261 INFO L226 Difference]: Without dead ends: 26 [2020-10-13 10:57:48,262 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-10-13 10:57:48,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-10-13 10:57:48,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-10-13 10:57:48,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-13 10:57:48,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-10-13 10:57:48,267 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-10-13 10:57:48,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:48,267 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-10-13 10:57:48,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-13 10:57:48,268 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-10-13 10:57:48,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-13 10:57:48,268 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:48,268 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:48,269 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-10-13 10:57:48,269 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:48,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:48,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1616531894, now seen corresponding path program 11 times [2020-10-13 10:57:48,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:48,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763525394] [2020-10-13 10:57:48,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:48,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:48,288 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:48,393 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:48,705 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:48,705 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 33 [2020-10-13 10:57:48,705 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:48,705 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 424 [2020-10-13 10:57:48,706 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:48,706 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 13 [2020-10-13 10:57:48,706 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:48,706 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-10-13 10:57:48,706 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:48,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:48,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:48,906 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:48,906 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:48,907 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:48,907 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:48,907 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:48,907 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:48,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:48,908 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:48,908 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:48,908 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:48,910 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:48,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763525394] [2020-10-13 10:57:48,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:48,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-10-13 10:57:48,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831658661] [2020-10-13 10:57:48,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-13 10:57:48,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:48,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-13 10:57:48,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-10-13 10:57:48,913 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 15 states. [2020-10-13 10:57:49,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:49,270 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-10-13 10:57:49,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-10-13 10:57:49,271 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-10-13 10:57:49,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:49,271 INFO L225 Difference]: With dead ends: 34 [2020-10-13 10:57:49,272 INFO L226 Difference]: Without dead ends: 27 [2020-10-13 10:57:49,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-10-13 10:57:49,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-10-13 10:57:49,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-10-13 10:57:49,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-10-13 10:57:49,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-10-13 10:57:49,277 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-10-13 10:57:49,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:49,277 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-10-13 10:57:49,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-13 10:57:49,277 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-10-13 10:57:49,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-10-13 10:57:49,278 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:49,278 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:49,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-10-13 10:57:49,278 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:49,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:49,279 INFO L82 PathProgramCache]: Analyzing trace with hash 806322452, now seen corresponding path program 12 times [2020-10-13 10:57:49,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:49,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260334042] [2020-10-13 10:57:49,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:49,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:49,296 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:49,468 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:49,580 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:49,580 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 34 [2020-10-13 10:57:49,581 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:49,581 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 290 [2020-10-13 10:57:49,581 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:49,581 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 14 [2020-10-13 10:57:49,581 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:49,582 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-13 10:57:49,582 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:49,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:49,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:49,806 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:49,807 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:49,808 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:49,808 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:49,808 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:49,808 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:49,808 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:49,809 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:49,809 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:49,809 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:49,812 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:49,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260334042] [2020-10-13 10:57:49,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:49,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-10-13 10:57:49,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591838837] [2020-10-13 10:57:49,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-10-13 10:57:49,813 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:49,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-10-13 10:57:49,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-10-13 10:57:49,814 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 16 states. [2020-10-13 10:57:50,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:50,190 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-10-13 10:57:50,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-13 10:57:50,191 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 26 [2020-10-13 10:57:50,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:50,192 INFO L225 Difference]: With dead ends: 35 [2020-10-13 10:57:50,192 INFO L226 Difference]: Without dead ends: 28 [2020-10-13 10:57:50,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-10-13 10:57:50,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-10-13 10:57:50,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-10-13 10:57:50,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-10-13 10:57:50,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-10-13 10:57:50,197 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-10-13 10:57:50,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:50,197 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-10-13 10:57:50,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-10-13 10:57:50,198 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-10-13 10:57:50,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-13 10:57:50,198 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:50,199 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:50,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-10-13 10:57:50,199 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:50,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:50,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1459633526, now seen corresponding path program 13 times [2020-10-13 10:57:50,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:50,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1889050395] [2020-10-13 10:57:50,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:50,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:50,217 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:50,318 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:50,588 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:50,588 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 35 [2020-10-13 10:57:50,589 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:50,589 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 377 [2020-10-13 10:57:50,589 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:50,590 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 15 [2020-10-13 10:57:50,590 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:50,590 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 17 [2020-10-13 10:57:50,590 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:57:50,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:50,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:50,839 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:50,840 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:50,840 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:50,841 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:50,841 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:50,841 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:50,841 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:50,841 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:50,841 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:50,842 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:50,844 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:50,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1889050395] [2020-10-13 10:57:50,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:50,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-10-13 10:57:50,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765295433] [2020-10-13 10:57:50,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-13 10:57:50,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:50,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-13 10:57:50,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-10-13 10:57:50,846 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 17 states. [2020-10-13 10:57:51,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:51,251 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-10-13 10:57:51,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-10-13 10:57:51,252 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 27 [2020-10-13 10:57:51,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:51,253 INFO L225 Difference]: With dead ends: 36 [2020-10-13 10:57:51,253 INFO L226 Difference]: Without dead ends: 29 [2020-10-13 10:57:51,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-10-13 10:57:51,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-10-13 10:57:51,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-10-13 10:57:51,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-10-13 10:57:51,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-10-13 10:57:51,258 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-10-13 10:57:51,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:51,259 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-10-13 10:57:51,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-13 10:57:51,259 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-10-13 10:57:51,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-13 10:57:51,259 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:51,260 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:51,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-10-13 10:57:51,261 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:51,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:51,262 INFO L82 PathProgramCache]: Analyzing trace with hash 237440340, now seen corresponding path program 14 times [2020-10-13 10:57:51,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:51,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771076049] [2020-10-13 10:57:51,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:51,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:51,280 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:51,415 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:51,689 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:51,689 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 36 [2020-10-13 10:57:51,689 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:51,689 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 415 [2020-10-13 10:57:51,690 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:51,690 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 16 [2020-10-13 10:57:51,690 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:51,690 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-10-13 10:57:51,690 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:51,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:51,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:51,970 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:51,971 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:51,971 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:51,971 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:51,972 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:51,972 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:51,983 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:51,983 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:51,983 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:51,983 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 11 [2020-10-13 10:57:51,987 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:51,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771076049] [2020-10-13 10:57:51,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:51,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-10-13 10:57:51,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449582029] [2020-10-13 10:57:51,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-10-13 10:57:51,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:51,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-10-13 10:57:51,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-10-13 10:57:51,991 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 18 states. [2020-10-13 10:57:52,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:52,425 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-10-13 10:57:52,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-10-13 10:57:52,425 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 28 [2020-10-13 10:57:52,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:52,426 INFO L225 Difference]: With dead ends: 37 [2020-10-13 10:57:52,426 INFO L226 Difference]: Without dead ends: 30 [2020-10-13 10:57:52,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-10-13 10:57:52,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-10-13 10:57:52,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-10-13 10:57:52,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-13 10:57:52,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-10-13 10:57:52,434 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-10-13 10:57:52,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:52,434 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-10-13 10:57:52,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-10-13 10:57:52,434 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-10-13 10:57:52,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-13 10:57:52,436 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:52,436 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:52,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-10-13 10:57:52,436 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:52,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:52,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1004157238, now seen corresponding path program 15 times [2020-10-13 10:57:52,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:52,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [144420245] [2020-10-13 10:57:52,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:52,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:52,457 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:52,577 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:52,842 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:52,842 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 37 [2020-10-13 10:57:52,842 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:52,843 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 391 [2020-10-13 10:57:52,843 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:52,843 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 17 [2020-10-13 10:57:52,843 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:52,843 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 19 [2020-10-13 10:57:52,843 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:53,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:53,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:53,187 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:53,187 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:53,188 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:53,188 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:53,188 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:53,189 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:53,189 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:53,189 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:53,189 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:53,189 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:53,192 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:53,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [144420245] [2020-10-13 10:57:53,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:53,193 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-10-13 10:57:53,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934081367] [2020-10-13 10:57:53,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-10-13 10:57:53,194 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:53,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-10-13 10:57:53,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-10-13 10:57:53,195 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 19 states. [2020-10-13 10:57:53,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:53,681 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-10-13 10:57:53,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-10-13 10:57:53,682 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 29 [2020-10-13 10:57:53,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:53,682 INFO L225 Difference]: With dead ends: 38 [2020-10-13 10:57:53,682 INFO L226 Difference]: Without dead ends: 31 [2020-10-13 10:57:53,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-10-13 10:57:53,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-10-13 10:57:53,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-10-13 10:57:53,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-13 10:57:53,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-10-13 10:57:53,692 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-10-13 10:57:53,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:53,697 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-10-13 10:57:53,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-10-13 10:57:53,697 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-10-13 10:57:53,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-13 10:57:53,698 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:53,698 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:53,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-10-13 10:57:53,698 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:53,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:53,699 INFO L82 PathProgramCache]: Analyzing trace with hash -997422700, now seen corresponding path program 16 times [2020-10-13 10:57:53,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:53,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1074136560] [2020-10-13 10:57:53,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:53,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:53,724 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:53,929 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:54,384 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:54,385 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 38 [2020-10-13 10:57:54,385 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:54,385 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 668 [2020-10-13 10:57:54,385 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:54,385 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 18 [2020-10-13 10:57:54,386 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:54,386 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 20 [2020-10-13 10:57:54,386 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:54,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:54,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:54,754 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:54,755 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:54,755 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:54,755 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:54,755 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:54,755 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:54,756 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:54,756 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:54,756 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:54,756 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:54,761 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:54,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1074136560] [2020-10-13 10:57:54,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:54,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-10-13 10:57:54,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292078332] [2020-10-13 10:57:54,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-10-13 10:57:54,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:54,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-10-13 10:57:54,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-10-13 10:57:54,769 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 20 states. [2020-10-13 10:57:55,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:55,306 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-10-13 10:57:55,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-10-13 10:57:55,307 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 30 [2020-10-13 10:57:55,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:55,308 INFO L225 Difference]: With dead ends: 39 [2020-10-13 10:57:55,308 INFO L226 Difference]: Without dead ends: 32 [2020-10-13 10:57:55,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-10-13 10:57:55,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-10-13 10:57:55,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-10-13 10:57:55,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-13 10:57:55,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-10-13 10:57:55,317 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-10-13 10:57:55,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:55,317 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-10-13 10:57:55,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-10-13 10:57:55,318 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-10-13 10:57:55,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-10-13 10:57:55,318 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:55,318 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:55,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-10-13 10:57:55,319 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:55,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:55,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1378108662, now seen corresponding path program 17 times [2020-10-13 10:57:55,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:55,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1553949825] [2020-10-13 10:57:55,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:55,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:55,339 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:55,462 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:55,969 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:55,970 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 39 [2020-10-13 10:57:55,970 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:55,970 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 637 [2020-10-13 10:57:55,970 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:55,970 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 19 [2020-10-13 10:57:55,970 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:55,971 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-13 10:57:55,971 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:56,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:56,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:56,324 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:56,325 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:56,325 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:56,325 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:56,325 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:56,325 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:56,326 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:56,326 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:56,326 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:56,326 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:56,330 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:56,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1553949825] [2020-10-13 10:57:56,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:56,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-10-13 10:57:56,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003075461] [2020-10-13 10:57:56,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-10-13 10:57:56,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:56,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-10-13 10:57:56,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-10-13 10:57:56,333 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 21 states. [2020-10-13 10:57:56,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:56,938 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-10-13 10:57:56,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-10-13 10:57:56,938 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 31 [2020-10-13 10:57:56,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:56,939 INFO L225 Difference]: With dead ends: 40 [2020-10-13 10:57:56,939 INFO L226 Difference]: Without dead ends: 33 [2020-10-13 10:57:56,940 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-10-13 10:57:56,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-10-13 10:57:56,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-10-13 10:57:56,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-10-13 10:57:56,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-10-13 10:57:56,948 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-10-13 10:57:56,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:56,951 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-10-13 10:57:56,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-10-13 10:57:56,952 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-10-13 10:57:56,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-13 10:57:56,953 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:56,953 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:56,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-10-13 10:57:56,954 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:56,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:56,954 INFO L82 PathProgramCache]: Analyzing trace with hash 2005136852, now seen corresponding path program 18 times [2020-10-13 10:57:56,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:56,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627906774] [2020-10-13 10:57:56,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:56,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:56,974 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:57,171 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:57,626 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:57,626 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-13 10:57:57,626 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:57,626 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 659 [2020-10-13 10:57:57,626 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:57,627 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 20 [2020-10-13 10:57:57,627 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:57,627 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 22 [2020-10-13 10:57:57,627 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:58,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:58,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:58,008 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:58,009 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:58,009 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:58,009 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:58,010 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:57:58,010 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:58,010 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:58,010 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:58,010 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:58,011 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:58,013 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:58,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [627906774] [2020-10-13 10:57:58,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:58,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-10-13 10:57:58,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766021553] [2020-10-13 10:57:58,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-10-13 10:57:58,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:58,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-10-13 10:57:58,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-10-13 10:57:58,016 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 22 states. [2020-10-13 10:57:58,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:57:58,746 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-10-13 10:57:58,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-10-13 10:57:58,747 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 32 [2020-10-13 10:57:58,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:57:58,748 INFO L225 Difference]: With dead ends: 41 [2020-10-13 10:57:58,748 INFO L226 Difference]: Without dead ends: 34 [2020-10-13 10:57:58,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-10-13 10:57:58,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-13 10:57:58,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-10-13 10:57:58,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-13 10:57:58,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-10-13 10:57:58,756 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-10-13 10:57:58,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:57:58,756 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-10-13 10:57:58,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-10-13 10:57:58,756 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-10-13 10:57:58,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-13 10:57:58,757 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:57:58,757 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:57:58,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-10-13 10:57:58,757 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:57:58,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:57:58,758 INFO L82 PathProgramCache]: Analyzing trace with hash -31825738, now seen corresponding path program 19 times [2020-10-13 10:57:58,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:57:58,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1835031971] [2020-10-13 10:57:58,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:57:58,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:58,778 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:59,085 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:59,153 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:59,153 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 41 [2020-10-13 10:57:59,153 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:57:59,154 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 383 [2020-10-13 10:57:59,154 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:59,154 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 21 [2020-10-13 10:57:59,154 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:57:59,154 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-10-13 10:57:59,155 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:59,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:57:59,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:57:59,566 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:57:59,566 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:57:59,567 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:57:59,567 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:57:59,567 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:57:59,567 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:57:59,567 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:57:59,567 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:57:59,567 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:57:59,567 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:57:59,570 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:57:59,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1835031971] [2020-10-13 10:57:59,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:57:59,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-10-13 10:57:59,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388764841] [2020-10-13 10:57:59,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-10-13 10:57:59,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:57:59,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-10-13 10:57:59,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-10-13 10:57:59,572 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 23 states. [2020-10-13 10:58:00,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:00,336 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-10-13 10:58:00,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-10-13 10:58:00,341 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 33 [2020-10-13 10:58:00,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:00,342 INFO L225 Difference]: With dead ends: 42 [2020-10-13 10:58:00,342 INFO L226 Difference]: Without dead ends: 35 [2020-10-13 10:58:00,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-10-13 10:58:00,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-10-13 10:58:00,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-10-13 10:58:00,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-13 10:58:00,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-10-13 10:58:00,359 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-10-13 10:58:00,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:00,359 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-10-13 10:58:00,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-10-13 10:58:00,359 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-10-13 10:58:00,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-10-13 10:58:00,360 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:00,363 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:00,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-10-13 10:58:00,363 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:00,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:00,364 INFO L82 PathProgramCache]: Analyzing trace with hash 1246843412, now seen corresponding path program 20 times [2020-10-13 10:58:00,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:00,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762930213] [2020-10-13 10:58:00,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:00,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:00,391 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:00,714 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:00,906 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:00,906 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 42 [2020-10-13 10:58:00,907 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:00,907 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 524 [2020-10-13 10:58:00,907 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:00,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 22 [2020-10-13 10:58:00,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:00,908 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 24 [2020-10-13 10:58:00,908 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:01,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:01,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:01,337 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:01,338 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:01,338 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:01,338 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:01,339 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:01,339 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:01,339 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:01,340 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:01,340 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:01,340 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:58:01,346 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:01,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762930213] [2020-10-13 10:58:01,346 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:01,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-10-13 10:58:01,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783632614] [2020-10-13 10:58:01,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-10-13 10:58:01,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:01,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-10-13 10:58:01,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-10-13 10:58:01,349 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 24 states. [2020-10-13 10:58:02,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:02,258 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-10-13 10:58:02,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-10-13 10:58:02,260 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2020-10-13 10:58:02,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:02,261 INFO L225 Difference]: With dead ends: 43 [2020-10-13 10:58:02,261 INFO L226 Difference]: Without dead ends: 36 [2020-10-13 10:58:02,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-10-13 10:58:02,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-13 10:58:02,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-10-13 10:58:02,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-10-13 10:58:02,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-10-13 10:58:02,268 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-10-13 10:58:02,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:02,268 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-10-13 10:58:02,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-10-13 10:58:02,268 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-10-13 10:58:02,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-10-13 10:58:02,269 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:02,269 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:02,269 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-10-13 10:58:02,269 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:02,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:02,270 INFO L82 PathProgramCache]: Analyzing trace with hash -2064085898, now seen corresponding path program 21 times [2020-10-13 10:58:02,270 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:02,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162213657] [2020-10-13 10:58:02,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:02,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:02,290 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:02,667 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:02,946 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:02,946 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 43 [2020-10-13 10:58:02,947 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:02,947 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 664 [2020-10-13 10:58:02,947 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:02,948 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 23 [2020-10-13 10:58:02,948 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:02,948 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 25 [2020-10-13 10:58:02,949 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:58:03,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:03,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:03,627 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:03,628 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:03,629 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:03,629 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:03,629 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:03,630 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:03,630 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:03,630 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:03,631 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:03,631 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:58:03,636 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:03,637 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162213657] [2020-10-13 10:58:03,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:03,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-10-13 10:58:03,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870575585] [2020-10-13 10:58:03,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-10-13 10:58:03,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:03,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-10-13 10:58:03,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-10-13 10:58:03,644 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 25 states. [2020-10-13 10:58:04,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:04,524 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-10-13 10:58:04,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-10-13 10:58:04,525 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 35 [2020-10-13 10:58:04,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:04,525 INFO L225 Difference]: With dead ends: 44 [2020-10-13 10:58:04,525 INFO L226 Difference]: Without dead ends: 37 [2020-10-13 10:58:04,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-10-13 10:58:04,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-10-13 10:58:04,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-10-13 10:58:04,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-10-13 10:58:04,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-10-13 10:58:04,533 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-10-13 10:58:04,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:04,533 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-10-13 10:58:04,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-10-13 10:58:04,534 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-10-13 10:58:04,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-10-13 10:58:04,534 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:04,534 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:04,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-10-13 10:58:04,535 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:04,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:04,535 INFO L82 PathProgramCache]: Analyzing trace with hash -1623679404, now seen corresponding path program 22 times [2020-10-13 10:58:04,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:04,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527700701] [2020-10-13 10:58:04,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:04,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:04,557 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:04,989 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:05,235 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:05,235 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-10-13 10:58:05,236 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:05,236 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 688 [2020-10-13 10:58:05,236 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:05,237 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 24 [2020-10-13 10:58:05,237 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:05,237 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 26 [2020-10-13 10:58:05,238 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:58:05,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:05,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:05,771 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:05,772 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:05,772 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:05,772 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:05,772 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:05,773 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:05,773 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:05,773 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:05,773 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:05,773 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:05,776 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:05,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527700701] [2020-10-13 10:58:05,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:05,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-10-13 10:58:05,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658215903] [2020-10-13 10:58:05,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-10-13 10:58:05,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:05,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-10-13 10:58:05,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-10-13 10:58:05,777 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 26 states. [2020-10-13 10:58:06,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:06,730 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-10-13 10:58:06,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-10-13 10:58:06,731 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 36 [2020-10-13 10:58:06,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:06,732 INFO L225 Difference]: With dead ends: 45 [2020-10-13 10:58:06,732 INFO L226 Difference]: Without dead ends: 38 [2020-10-13 10:58:06,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-10-13 10:58:06,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-10-13 10:58:06,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-10-13 10:58:06,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-10-13 10:58:06,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-10-13 10:58:06,741 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-10-13 10:58:06,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:06,742 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-10-13 10:58:06,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-10-13 10:58:06,742 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-10-13 10:58:06,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-10-13 10:58:06,742 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:06,743 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:06,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-10-13 10:58:06,744 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:06,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:06,744 INFO L82 PathProgramCache]: Analyzing trace with hash -855979978, now seen corresponding path program 23 times [2020-10-13 10:58:06,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:06,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013958075] [2020-10-13 10:58:06,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:06,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:06,764 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:07,239 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:07,582 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:07,582 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 45 [2020-10-13 10:58:07,582 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:07,582 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 825 [2020-10-13 10:58:07,583 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:07,583 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 25 [2020-10-13 10:58:07,583 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:07,583 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 27 [2020-10-13 10:58:07,583 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:08,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:08,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:08,119 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:08,120 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:08,120 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:08,120 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:08,120 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:08,121 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:08,121 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:08,121 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:08,121 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:08,122 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:08,124 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:08,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013958075] [2020-10-13 10:58:08,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:08,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-10-13 10:58:08,125 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693893383] [2020-10-13 10:58:08,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-10-13 10:58:08,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:08,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-10-13 10:58:08,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-10-13 10:58:08,126 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 27 states. [2020-10-13 10:58:09,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:09,150 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-10-13 10:58:09,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-10-13 10:58:09,150 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 37 [2020-10-13 10:58:09,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:09,151 INFO L225 Difference]: With dead ends: 46 [2020-10-13 10:58:09,151 INFO L226 Difference]: Without dead ends: 39 [2020-10-13 10:58:09,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-10-13 10:58:09,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-10-13 10:58:09,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-10-13 10:58:09,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-10-13 10:58:09,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-10-13 10:58:09,157 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-10-13 10:58:09,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:09,158 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-10-13 10:58:09,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-10-13 10:58:09,158 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-10-13 10:58:09,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-10-13 10:58:09,158 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:09,158 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:09,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-10-13 10:58:09,159 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:09,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:09,159 INFO L82 PathProgramCache]: Analyzing trace with hash 1467865748, now seen corresponding path program 24 times [2020-10-13 10:58:09,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:09,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239555301] [2020-10-13 10:58:09,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:09,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:09,181 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:09,850 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:10,028 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:10,028 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 46 [2020-10-13 10:58:10,028 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:10,028 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 856 [2020-10-13 10:58:10,029 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:10,029 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 26 [2020-10-13 10:58:10,029 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:10,029 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 28 [2020-10-13 10:58:10,029 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:10,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:10,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:10,596 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:10,597 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:10,597 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:10,597 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:10,597 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:10,597 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:10,598 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:10,598 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:10,598 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:10,598 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:10,601 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:10,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [239555301] [2020-10-13 10:58:10,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:10,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-10-13 10:58:10,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991484427] [2020-10-13 10:58:10,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-10-13 10:58:10,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:10,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-10-13 10:58:10,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-10-13 10:58:10,603 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 28 states. [2020-10-13 10:58:11,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:11,699 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-10-13 10:58:11,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-10-13 10:58:11,700 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 38 [2020-10-13 10:58:11,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:11,701 INFO L225 Difference]: With dead ends: 47 [2020-10-13 10:58:11,701 INFO L226 Difference]: Without dead ends: 40 [2020-10-13 10:58:11,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 300 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=153, Invalid=2603, Unknown=0, NotChecked=0, Total=2756 [2020-10-13 10:58:11,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-10-13 10:58:11,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-10-13 10:58:11,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-10-13 10:58:11,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-10-13 10:58:11,707 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-10-13 10:58:11,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:11,707 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-10-13 10:58:11,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-10-13 10:58:11,708 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-10-13 10:58:11,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-10-13 10:58:11,708 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:11,708 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:11,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-10-13 10:58:11,709 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:11,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:11,709 INFO L82 PathProgramCache]: Analyzing trace with hash 492639222, now seen corresponding path program 25 times [2020-10-13 10:58:11,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:11,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [766358360] [2020-10-13 10:58:11,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:11,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:11,731 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:12,386 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:12,510 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:12,510 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 47 [2020-10-13 10:58:12,510 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:12,511 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 788 [2020-10-13 10:58:12,511 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:12,511 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 27 [2020-10-13 10:58:12,511 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:12,511 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 29 [2020-10-13 10:58:12,511 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:13,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:13,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:13,060 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:13,061 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:13,061 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:13,061 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:13,061 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:58:13,062 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:13,062 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:13,062 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:13,062 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:13,062 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:13,066 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:13,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [766358360] [2020-10-13 10:58:13,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:13,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-10-13 10:58:13,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426560235] [2020-10-13 10:58:13,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-10-13 10:58:13,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:13,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-10-13 10:58:13,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-10-13 10:58:13,068 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 29 states. [2020-10-13 10:58:14,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:14,122 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-10-13 10:58:14,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-10-13 10:58:14,123 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 39 [2020-10-13 10:58:14,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:14,123 INFO L225 Difference]: With dead ends: 48 [2020-10-13 10:58:14,123 INFO L226 Difference]: Without dead ends: 41 [2020-10-13 10:58:14,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=159, Invalid=2811, Unknown=0, NotChecked=0, Total=2970 [2020-10-13 10:58:14,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-10-13 10:58:14,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-10-13 10:58:14,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-13 10:58:14,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-10-13 10:58:14,133 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-10-13 10:58:14,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:14,133 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-10-13 10:58:14,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-10-13 10:58:14,133 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-10-13 10:58:14,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-10-13 10:58:14,133 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:14,134 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:14,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-10-13 10:58:14,134 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:14,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:14,134 INFO L82 PathProgramCache]: Analyzing trace with hash 325387988, now seen corresponding path program 26 times [2020-10-13 10:58:14,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:14,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [652986907] [2020-10-13 10:58:14,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:14,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:14,152 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:14,694 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:14,916 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:14,916 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 48 [2020-10-13 10:58:14,917 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:14,917 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 770 [2020-10-13 10:58:14,917 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:14,917 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 28 [2020-10-13 10:58:14,918 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:14,918 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 30 [2020-10-13 10:58:14,918 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:58:15,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:15,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:15,581 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:15,581 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:15,582 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:15,582 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:15,582 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:58:15,582 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:15,582 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:15,582 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:15,582 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:15,582 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:15,586 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:15,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [652986907] [2020-10-13 10:58:15,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:15,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-10-13 10:58:15,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561553641] [2020-10-13 10:58:15,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-10-13 10:58:15,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:15,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-10-13 10:58:15,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-10-13 10:58:15,588 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 30 states. [2020-10-13 10:58:16,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:16,844 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-10-13 10:58:16,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-10-13 10:58:16,844 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 40 [2020-10-13 10:58:16,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:16,845 INFO L225 Difference]: With dead ends: 49 [2020-10-13 10:58:16,845 INFO L226 Difference]: Without dead ends: 42 [2020-10-13 10:58:16,847 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=165, Invalid=3027, Unknown=0, NotChecked=0, Total=3192 [2020-10-13 10:58:16,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-10-13 10:58:16,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-10-13 10:58:16,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-10-13 10:58:16,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-10-13 10:58:16,853 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-10-13 10:58:16,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:16,853 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-10-13 10:58:16,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-10-13 10:58:16,854 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-10-13 10:58:16,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-10-13 10:58:16,854 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:16,854 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:16,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-10-13 10:58:16,855 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:16,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:16,855 INFO L82 PathProgramCache]: Analyzing trace with hash -564432970, now seen corresponding path program 27 times [2020-10-13 10:58:16,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:16,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559955617] [2020-10-13 10:58:16,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:16,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:16,877 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:17,348 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:18,015 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:18,015 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 49 [2020-10-13 10:58:18,015 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:18,016 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1146 [2020-10-13 10:58:18,016 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:18,016 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 29 [2020-10-13 10:58:18,016 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:18,016 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 31 [2020-10-13 10:58:18,016 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:18,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:18,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:18,681 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:18,682 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:18,683 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:18,683 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:18,683 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:18,683 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:18,684 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:18,684 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:18,684 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:18,684 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:18,688 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:18,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559955617] [2020-10-13 10:58:18,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:18,689 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-10-13 10:58:18,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538401045] [2020-10-13 10:58:18,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-10-13 10:58:18,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:18,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-10-13 10:58:18,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-10-13 10:58:18,690 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 31 states. [2020-10-13 10:58:20,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:20,019 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-10-13 10:58:20,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-10-13 10:58:20,019 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 41 [2020-10-13 10:58:20,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:20,020 INFO L225 Difference]: With dead ends: 50 [2020-10-13 10:58:20,020 INFO L226 Difference]: Without dead ends: 43 [2020-10-13 10:58:20,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=171, Invalid=3251, Unknown=0, NotChecked=0, Total=3422 [2020-10-13 10:58:20,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-10-13 10:58:20,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-10-13 10:58:20,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-10-13 10:58:20,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-10-13 10:58:20,027 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-10-13 10:58:20,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:20,027 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-10-13 10:58:20,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-10-13 10:58:20,028 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-10-13 10:58:20,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-13 10:58:20,028 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:20,028 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:20,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-10-13 10:58:20,029 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:20,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:20,029 INFO L82 PathProgramCache]: Analyzing trace with hash 1915888404, now seen corresponding path program 28 times [2020-10-13 10:58:20,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:20,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [907397932] [2020-10-13 10:58:20,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:20,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:20,055 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:20,557 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:20,587 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:20,587 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50 [2020-10-13 10:58:20,588 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:20,588 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 547 [2020-10-13 10:58:20,588 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:20,588 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 30 [2020-10-13 10:58:20,588 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:20,588 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 32 [2020-10-13 10:58:20,588 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:21,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:21,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:21,301 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:21,302 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:21,302 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:21,303 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:21,303 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:21,303 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:21,303 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:21,303 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:21,303 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:21,303 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:21,306 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:21,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [907397932] [2020-10-13 10:58:21,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:21,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-10-13 10:58:21,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231854202] [2020-10-13 10:58:21,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-10-13 10:58:21,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:21,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-10-13 10:58:21,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-10-13 10:58:21,309 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 32 states. [2020-10-13 10:58:22,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:22,723 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-10-13 10:58:22,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-10-13 10:58:22,724 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 42 [2020-10-13 10:58:22,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:22,725 INFO L225 Difference]: With dead ends: 51 [2020-10-13 10:58:22,725 INFO L226 Difference]: Without dead ends: 44 [2020-10-13 10:58:22,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 406 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=177, Invalid=3483, Unknown=0, NotChecked=0, Total=3660 [2020-10-13 10:58:22,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-10-13 10:58:22,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-10-13 10:58:22,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-10-13 10:58:22,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-10-13 10:58:22,732 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-10-13 10:58:22,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:22,733 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-10-13 10:58:22,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-10-13 10:58:22,733 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-10-13 10:58:22,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-10-13 10:58:22,733 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:22,733 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:22,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-10-13 10:58:22,734 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:22,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:22,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1496439670, now seen corresponding path program 29 times [2020-10-13 10:58:22,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:22,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280527554] [2020-10-13 10:58:22,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:22,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:22,751 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:23,133 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:23,170 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:23,170 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 51 [2020-10-13 10:58:23,171 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:23,171 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 425 [2020-10-13 10:58:23,171 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:23,171 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 31 [2020-10-13 10:58:23,171 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:23,171 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 33 [2020-10-13 10:58:23,171 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:23,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:23,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:23,934 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:23,935 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:23,935 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:23,935 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:23,935 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:58:23,935 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:23,935 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:23,935 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:23,935 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:23,936 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:23,939 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:23,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280527554] [2020-10-13 10:58:23,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:23,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-10-13 10:58:23,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541197001] [2020-10-13 10:58:23,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-10-13 10:58:23,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:23,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-10-13 10:58:23,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-10-13 10:58:23,940 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 33 states. [2020-10-13 10:58:25,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:25,369 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-10-13 10:58:25,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-10-13 10:58:25,370 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 43 [2020-10-13 10:58:25,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:25,370 INFO L225 Difference]: With dead ends: 52 [2020-10-13 10:58:25,370 INFO L226 Difference]: Without dead ends: 45 [2020-10-13 10:58:25,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=183, Invalid=3723, Unknown=0, NotChecked=0, Total=3906 [2020-10-13 10:58:25,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-10-13 10:58:25,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-10-13 10:58:25,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-10-13 10:58:25,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-10-13 10:58:25,380 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-10-13 10:58:25,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:25,381 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-10-13 10:58:25,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-10-13 10:58:25,381 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-10-13 10:58:25,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-10-13 10:58:25,381 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:25,381 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:25,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-10-13 10:58:25,382 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:25,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:25,382 INFO L82 PathProgramCache]: Analyzing trace with hash 1378430804, now seen corresponding path program 30 times [2020-10-13 10:58:25,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:25,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885814187] [2020-10-13 10:58:25,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:25,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:25,399 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:25,786 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:26,379 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:26,379 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 52 [2020-10-13 10:58:26,379 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:26,380 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 986 [2020-10-13 10:58:26,380 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:26,380 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 32 [2020-10-13 10:58:26,380 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:26,380 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 34 [2020-10-13 10:58:26,380 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:27,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:27,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:27,395 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:27,396 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:27,396 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:27,397 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:27,402 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:27,403 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:27,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:27,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:27,403 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:27,404 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:58:27,414 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:27,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885814187] [2020-10-13 10:58:27,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:27,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-10-13 10:58:27,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839558527] [2020-10-13 10:58:27,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-10-13 10:58:27,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:27,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-10-13 10:58:27,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-10-13 10:58:27,419 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 34 states. [2020-10-13 10:58:29,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:29,081 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-10-13 10:58:29,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-10-13 10:58:29,083 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 44 [2020-10-13 10:58:29,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:29,083 INFO L225 Difference]: With dead ends: 53 [2020-10-13 10:58:29,084 INFO L226 Difference]: Without dead ends: 46 [2020-10-13 10:58:29,086 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 465 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=189, Invalid=3971, Unknown=0, NotChecked=0, Total=4160 [2020-10-13 10:58:29,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-10-13 10:58:29,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-10-13 10:58:29,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-13 10:58:29,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-10-13 10:58:29,090 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-10-13 10:58:29,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:29,090 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-10-13 10:58:29,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-10-13 10:58:29,090 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-10-13 10:58:29,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-13 10:58:29,091 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:29,091 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:29,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-10-13 10:58:29,091 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:29,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:29,092 INFO L82 PathProgramCache]: Analyzing trace with hash 2015123254, now seen corresponding path program 31 times [2020-10-13 10:58:29,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:29,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1155968288] [2020-10-13 10:58:29,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:29,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:29,112 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:29,431 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:30,113 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:30,114 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 53 [2020-10-13 10:58:30,114 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:30,114 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1008 [2020-10-13 10:58:30,114 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:30,114 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 33 [2020-10-13 10:58:30,114 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:30,114 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 35 [2020-10-13 10:58:30,114 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:31,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:31,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:31,042 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:31,042 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:31,042 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:31,042 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:31,043 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:58:31,043 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:31,043 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:31,043 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:31,043 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:31,043 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:31,047 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:31,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1155968288] [2020-10-13 10:58:31,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:31,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-10-13 10:58:31,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038484432] [2020-10-13 10:58:31,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-10-13 10:58:31,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:31,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-10-13 10:58:31,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-10-13 10:58:31,048 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 35 states. [2020-10-13 10:58:32,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:32,682 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-10-13 10:58:32,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-10-13 10:58:32,683 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 45 [2020-10-13 10:58:32,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:32,683 INFO L225 Difference]: With dead ends: 54 [2020-10-13 10:58:32,684 INFO L226 Difference]: Without dead ends: 47 [2020-10-13 10:58:32,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=195, Invalid=4227, Unknown=0, NotChecked=0, Total=4422 [2020-10-13 10:58:32,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-10-13 10:58:32,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-10-13 10:58:32,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-10-13 10:58:32,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-10-13 10:58:32,691 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-10-13 10:58:32,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:32,691 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-10-13 10:58:32,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-10-13 10:58:32,691 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-10-13 10:58:32,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-10-13 10:58:32,692 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:32,692 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:32,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-10-13 10:58:32,692 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:32,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:32,692 INFO L82 PathProgramCache]: Analyzing trace with hash 277752724, now seen corresponding path program 32 times [2020-10-13 10:58:32,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:32,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1332893529] [2020-10-13 10:58:32,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:32,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:32,720 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:33,177 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:33,306 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:33,306 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 54 [2020-10-13 10:58:33,306 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:33,306 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 593 [2020-10-13 10:58:33,306 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:33,307 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 34 [2020-10-13 10:58:33,307 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:33,307 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 36 [2020-10-13 10:58:33,307 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:34,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:34,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:34,149 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:34,150 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:34,150 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:34,150 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:34,150 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:34,151 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:34,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:34,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:34,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:34,151 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:34,156 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:34,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1332893529] [2020-10-13 10:58:34,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:34,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-10-13 10:58:34,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236075617] [2020-10-13 10:58:34,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-10-13 10:58:34,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:34,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-10-13 10:58:34,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-10-13 10:58:34,158 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 36 states. [2020-10-13 10:58:35,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:35,866 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-10-13 10:58:35,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-10-13 10:58:35,866 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 46 [2020-10-13 10:58:35,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:35,867 INFO L225 Difference]: With dead ends: 55 [2020-10-13 10:58:35,867 INFO L226 Difference]: Without dead ends: 48 [2020-10-13 10:58:35,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=201, Invalid=4491, Unknown=0, NotChecked=0, Total=4692 [2020-10-13 10:58:35,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-13 10:58:35,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-10-13 10:58:35,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-10-13 10:58:35,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-10-13 10:58:35,872 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-10-13 10:58:35,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:35,872 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-10-13 10:58:35,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-10-13 10:58:35,872 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-10-13 10:58:35,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-10-13 10:58:35,872 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:35,873 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:35,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-10-13 10:58:35,873 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:35,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:35,873 INFO L82 PathProgramCache]: Analyzing trace with hash -2041126154, now seen corresponding path program 33 times [2020-10-13 10:58:35,873 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:35,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1326946325] [2020-10-13 10:58:35,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:35,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:35,896 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:36,236 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:37,091 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:37,092 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 55 [2020-10-13 10:58:37,092 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:37,092 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1203 [2020-10-13 10:58:37,092 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:37,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 35 [2020-10-13 10:58:37,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:37,093 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 37 [2020-10-13 10:58:37,093 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:38,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:38,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:38,084 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:38,086 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:38,086 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:38,086 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:38,086 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:38,086 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:38,086 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:38,086 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:38,087 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:38,087 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:38,090 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:38,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1326946325] [2020-10-13 10:58:38,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:38,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-10-13 10:58:38,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456666059] [2020-10-13 10:58:38,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-10-13 10:58:38,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:38,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-10-13 10:58:38,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-10-13 10:58:38,092 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 37 states. [2020-10-13 10:58:40,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:40,010 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-10-13 10:58:40,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-10-13 10:58:40,011 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 47 [2020-10-13 10:58:40,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:40,012 INFO L225 Difference]: With dead ends: 56 [2020-10-13 10:58:40,012 INFO L226 Difference]: Without dead ends: 49 [2020-10-13 10:58:40,014 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=207, Invalid=4763, Unknown=0, NotChecked=0, Total=4970 [2020-10-13 10:58:40,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-10-13 10:58:40,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-10-13 10:58:40,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-10-13 10:58:40,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-10-13 10:58:40,018 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-10-13 10:58:40,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:40,019 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-10-13 10:58:40,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-10-13 10:58:40,019 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-10-13 10:58:40,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-10-13 10:58:40,019 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:40,020 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:40,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-10-13 10:58:40,020 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:40,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:40,020 INFO L82 PathProgramCache]: Analyzing trace with hash -911927340, now seen corresponding path program 34 times [2020-10-13 10:58:40,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:40,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504190917] [2020-10-13 10:58:40,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:40,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:40,048 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:40,460 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:41,299 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:41,299 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 56 [2020-10-13 10:58:41,299 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:41,300 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1263 [2020-10-13 10:58:41,300 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:41,300 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 36 [2020-10-13 10:58:41,300 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:41,300 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 38 [2020-10-13 10:58:41,300 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:42,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:42,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:42,306 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:42,307 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:42,307 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:42,308 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:42,308 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:42,308 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:42,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:42,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:42,308 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:42,308 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:42,312 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:42,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504190917] [2020-10-13 10:58:42,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:42,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-10-13 10:58:42,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354760303] [2020-10-13 10:58:42,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-10-13 10:58:42,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:42,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-10-13 10:58:42,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-10-13 10:58:42,314 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 38 states. [2020-10-13 10:58:44,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:44,295 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-10-13 10:58:44,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-10-13 10:58:44,298 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 48 [2020-10-13 10:58:44,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:44,299 INFO L225 Difference]: With dead ends: 57 [2020-10-13 10:58:44,299 INFO L226 Difference]: Without dead ends: 50 [2020-10-13 10:58:44,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=213, Invalid=5043, Unknown=0, NotChecked=0, Total=5256 [2020-10-13 10:58:44,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-10-13 10:58:44,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-10-13 10:58:44,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-10-13 10:58:44,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-10-13 10:58:44,304 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-10-13 10:58:44,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:44,307 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-10-13 10:58:44,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-10-13 10:58:44,307 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-10-13 10:58:44,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-10-13 10:58:44,307 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:44,307 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:44,307 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-10-13 10:58:44,308 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:44,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:44,308 INFO L82 PathProgramCache]: Analyzing trace with hash -266502474, now seen corresponding path program 35 times [2020-10-13 10:58:44,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:44,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200385082] [2020-10-13 10:58:44,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:44,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:44,332 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:44,923 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:45,002 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:45,003 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 57 [2020-10-13 10:58:45,003 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:45,003 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 683 [2020-10-13 10:58:45,003 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:45,003 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 37 [2020-10-13 10:58:45,003 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:45,004 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 39 [2020-10-13 10:58:45,004 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:46,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:46,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:46,044 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:46,045 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:46,045 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:46,046 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:46,046 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:46,046 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:46,046 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:46,046 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:46,046 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:46,046 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:46,050 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:46,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200385082] [2020-10-13 10:58:46,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:46,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-10-13 10:58:46,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452838319] [2020-10-13 10:58:46,052 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-10-13 10:58:46,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:46,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-10-13 10:58:46,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-10-13 10:58:46,053 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 39 states. [2020-10-13 10:58:48,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:48,109 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-10-13 10:58:48,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-10-13 10:58:48,109 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 49 [2020-10-13 10:58:48,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:48,111 INFO L225 Difference]: With dead ends: 58 [2020-10-13 10:58:48,111 INFO L226 Difference]: Without dead ends: 51 [2020-10-13 10:58:48,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=219, Invalid=5331, Unknown=0, NotChecked=0, Total=5550 [2020-10-13 10:58:48,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-10-13 10:58:48,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-10-13 10:58:48,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-10-13 10:58:48,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-10-13 10:58:48,117 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-10-13 10:58:48,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:48,117 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-10-13 10:58:48,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-10-13 10:58:48,117 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-10-13 10:58:48,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-10-13 10:58:48,118 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:48,118 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:48,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-10-13 10:58:48,118 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:48,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:48,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1733168108, now seen corresponding path program 36 times [2020-10-13 10:58:48,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:48,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [962504778] [2020-10-13 10:58:48,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:48,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:48,150 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:48,576 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:49,814 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:49,815 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 58 [2020-10-13 10:58:49,815 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:49,815 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1677 [2020-10-13 10:58:49,815 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:49,815 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 38 [2020-10-13 10:58:49,815 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:49,815 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 40 [2020-10-13 10:58:49,815 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:50,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:50,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:50,972 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:50,973 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:50,973 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:50,973 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:50,973 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:50,974 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:50,974 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:50,974 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:50,974 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:50,974 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:50,979 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:50,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [962504778] [2020-10-13 10:58:50,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:50,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-10-13 10:58:50,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982370602] [2020-10-13 10:58:50,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-10-13 10:58:50,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:50,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-10-13 10:58:50,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-10-13 10:58:50,981 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 40 states. [2020-10-13 10:58:53,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:53,209 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-10-13 10:58:53,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-10-13 10:58:53,210 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 50 [2020-10-13 10:58:53,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:53,211 INFO L225 Difference]: With dead ends: 59 [2020-10-13 10:58:53,211 INFO L226 Difference]: Without dead ends: 52 [2020-10-13 10:58:53,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=225, Invalid=5627, Unknown=0, NotChecked=0, Total=5852 [2020-10-13 10:58:53,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-10-13 10:58:53,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-10-13 10:58:53,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-10-13 10:58:53,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-10-13 10:58:53,215 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-10-13 10:58:53,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:53,215 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-10-13 10:58:53,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-10-13 10:58:53,216 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-10-13 10:58:53,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-10-13 10:58:53,216 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:53,216 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:53,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-10-13 10:58:53,216 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:53,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:53,216 INFO L82 PathProgramCache]: Analyzing trace with hash 44837494, now seen corresponding path program 37 times [2020-10-13 10:58:53,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:53,217 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [966995718] [2020-10-13 10:58:53,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:53,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:53,237 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:53,847 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:54,214 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:54,214 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 59 [2020-10-13 10:58:54,215 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:54,215 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 985 [2020-10-13 10:58:54,215 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:54,215 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 39 [2020-10-13 10:58:54,215 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:54,215 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 41 [2020-10-13 10:58:54,215 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:55,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:55,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:55,404 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:55,404 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:55,404 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:55,405 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:55,405 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:58:55,405 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:55,405 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:55,405 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:55,405 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:55,405 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:55,410 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:55,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [966995718] [2020-10-13 10:58:55,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:55,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-10-13 10:58:55,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549872301] [2020-10-13 10:58:55,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-10-13 10:58:55,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:55,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-10-13 10:58:55,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-10-13 10:58:55,411 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 41 states. [2020-10-13 10:58:57,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:58:57,658 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-10-13 10:58:57,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-10-13 10:58:57,659 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 51 [2020-10-13 10:58:57,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:58:57,660 INFO L225 Difference]: With dead ends: 60 [2020-10-13 10:58:57,660 INFO L226 Difference]: Without dead ends: 53 [2020-10-13 10:58:57,662 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 703 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=231, Invalid=5931, Unknown=0, NotChecked=0, Total=6162 [2020-10-13 10:58:57,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-10-13 10:58:57,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-10-13 10:58:57,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-10-13 10:58:57,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-10-13 10:58:57,667 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-10-13 10:58:57,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:58:57,667 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-10-13 10:58:57,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-10-13 10:58:57,667 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-10-13 10:58:57,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-10-13 10:58:57,668 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:58:57,668 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:58:57,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-10-13 10:58:57,668 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:58:57,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:58:57,669 INFO L82 PathProgramCache]: Analyzing trace with hash -671563692, now seen corresponding path program 38 times [2020-10-13 10:58:57,669 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:58:57,669 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [884856140] [2020-10-13 10:58:57,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:58:57,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:57,697 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:58,379 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:58,490 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:58,490 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 60 [2020-10-13 10:58:58,490 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:58:58,491 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 802 [2020-10-13 10:58:58,491 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:58,491 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 40 [2020-10-13 10:58:58,491 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:58:58,492 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 42 [2020-10-13 10:58:58,492 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:59,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:58:59,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:58:59,696 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:58:59,697 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:58:59,697 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:58:59,697 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:58:59,697 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:58:59,697 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:58:59,697 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:58:59,698 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:58:59,698 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:58:59,698 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:58:59,703 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:58:59,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [884856140] [2020-10-13 10:58:59,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:58:59,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-10-13 10:58:59,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152589613] [2020-10-13 10:58:59,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-10-13 10:58:59,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:58:59,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-10-13 10:58:59,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-10-13 10:58:59,704 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 42 states. [2020-10-13 10:59:02,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:59:02,078 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-10-13 10:59:02,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-10-13 10:59:02,083 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 52 [2020-10-13 10:59:02,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:59:02,084 INFO L225 Difference]: With dead ends: 61 [2020-10-13 10:59:02,084 INFO L226 Difference]: Without dead ends: 54 [2020-10-13 10:59:02,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 741 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=237, Invalid=6243, Unknown=0, NotChecked=0, Total=6480 [2020-10-13 10:59:02,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-10-13 10:59:02,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-10-13 10:59:02,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-10-13 10:59:02,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-10-13 10:59:02,090 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-10-13 10:59:02,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:59:02,090 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-10-13 10:59:02,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-10-13 10:59:02,091 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-10-13 10:59:02,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-10-13 10:59:02,091 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:59:02,091 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:59:02,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-10-13 10:59:02,092 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:59:02,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:59:02,092 INFO L82 PathProgramCache]: Analyzing trace with hash -1405163978, now seen corresponding path program 39 times [2020-10-13 10:59:02,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:59:02,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527519729] [2020-10-13 10:59:02,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:59:02,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:02,122 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:02,689 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:03,654 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:03,654 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 61 [2020-10-13 10:59:03,654 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:59:03,654 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1543 [2020-10-13 10:59:03,655 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:03,655 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 41 [2020-10-13 10:59:03,655 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:59:03,655 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 43 [2020-10-13 10:59:03,655 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:04,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:59:04,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:04,981 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:04,982 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:04,982 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:59:04,982 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:59:04,982 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:59:04,982 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:04,982 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:59:04,982 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:59:04,982 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:59:04,983 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:04,987 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:59:04,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527519729] [2020-10-13 10:59:04,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:59:04,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-10-13 10:59:04,988 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004345406] [2020-10-13 10:59:04,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-10-13 10:59:04,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:59:04,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-10-13 10:59:04,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-10-13 10:59:04,989 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 43 states. [2020-10-13 10:59:07,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:59:07,634 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-10-13 10:59:07,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-10-13 10:59:07,635 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 53 [2020-10-13 10:59:07,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:59:07,636 INFO L225 Difference]: With dead ends: 62 [2020-10-13 10:59:07,636 INFO L226 Difference]: Without dead ends: 55 [2020-10-13 10:59:07,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 780 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=243, Invalid=6563, Unknown=0, NotChecked=0, Total=6806 [2020-10-13 10:59:07,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-10-13 10:59:07,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-10-13 10:59:07,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-10-13 10:59:07,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-10-13 10:59:07,641 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-10-13 10:59:07,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:59:07,642 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-10-13 10:59:07,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-10-13 10:59:07,642 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-10-13 10:59:07,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-10-13 10:59:07,642 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:59:07,642 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:59:07,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-10-13 10:59:07,643 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:59:07,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:59:07,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1623030932, now seen corresponding path program 40 times [2020-10-13 10:59:07,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:59:07,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517309044] [2020-10-13 10:59:07,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:59:07,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:07,669 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:08,406 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:08,860 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:08,861 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 62 [2020-10-13 10:59:08,861 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:59:08,861 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1202 [2020-10-13 10:59:08,861 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:08,861 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 42 [2020-10-13 10:59:08,861 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:59:08,861 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 44 [2020-10-13 10:59:08,861 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:10,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:59:10,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:10,223 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:10,224 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:10,224 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:59:10,224 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:59:10,225 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:59:10,225 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:10,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:59:10,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:59:10,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:59:10,225 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:10,230 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:59:10,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517309044] [2020-10-13 10:59:10,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:59:10,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-10-13 10:59:10,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380005156] [2020-10-13 10:59:10,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-10-13 10:59:10,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:59:10,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-10-13 10:59:10,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-10-13 10:59:10,232 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 44 states. [2020-10-13 10:59:12,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:59:12,953 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-10-13 10:59:12,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-10-13 10:59:12,954 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 54 [2020-10-13 10:59:12,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:59:12,954 INFO L225 Difference]: With dead ends: 63 [2020-10-13 10:59:12,955 INFO L226 Difference]: Without dead ends: 56 [2020-10-13 10:59:12,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=249, Invalid=6891, Unknown=0, NotChecked=0, Total=7140 [2020-10-13 10:59:12,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-10-13 10:59:12,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-10-13 10:59:12,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-10-13 10:59:12,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-10-13 10:59:12,958 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-10-13 10:59:12,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:59:12,958 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-10-13 10:59:12,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-10-13 10:59:12,959 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-10-13 10:59:12,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-10-13 10:59:12,959 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:59:12,959 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:59:12,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-10-13 10:59:12,959 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:59:12,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:59:12,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1007792630, now seen corresponding path program 41 times [2020-10-13 10:59:12,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:59:12,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2129601936] [2020-10-13 10:59:12,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:59:12,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:12,987 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:13,567 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:14,577 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:14,577 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 63 [2020-10-13 10:59:14,577 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:59:14,577 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1600 [2020-10-13 10:59:14,577 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:14,577 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 43 [2020-10-13 10:59:14,577 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:59:14,578 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 45 [2020-10-13 10:59:14,578 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:16,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:59:16,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:16,088 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:16,089 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:16,090 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:59:16,090 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:59:16,090 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:59:16,090 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:16,091 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:59:16,091 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:59:16,091 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:59:16,092 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:59:16,103 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:59:16,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2129601936] [2020-10-13 10:59:16,103 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:59:16,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-10-13 10:59:16,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587333725] [2020-10-13 10:59:16,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-10-13 10:59:16,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:59:16,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-10-13 10:59:16,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-10-13 10:59:16,105 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 45 states. [2020-10-13 10:59:19,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:59:19,043 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-10-13 10:59:19,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-10-13 10:59:19,043 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 55 [2020-10-13 10:59:19,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:59:19,045 INFO L225 Difference]: With dead ends: 64 [2020-10-13 10:59:19,045 INFO L226 Difference]: Without dead ends: 57 [2020-10-13 10:59:19,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 861 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=255, Invalid=7227, Unknown=0, NotChecked=0, Total=7482 [2020-10-13 10:59:19,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-10-13 10:59:19,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-10-13 10:59:19,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-10-13 10:59:19,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-10-13 10:59:19,051 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-10-13 10:59:19,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:59:19,051 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-10-13 10:59:19,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-10-13 10:59:19,051 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-10-13 10:59:19,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-10-13 10:59:19,052 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:59:19,052 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:59:19,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-10-13 10:59:19,052 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:59:19,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:59:19,053 INFO L82 PathProgramCache]: Analyzing trace with hash -884725548, now seen corresponding path program 42 times [2020-10-13 10:59:19,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:59:19,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [800856640] [2020-10-13 10:59:19,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:59:19,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:19,092 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:19,756 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:20,595 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:20,595 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 64 [2020-10-13 10:59:20,595 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:59:20,595 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1520 [2020-10-13 10:59:20,595 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:20,595 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 44 [2020-10-13 10:59:20,596 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:59:20,596 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 46 [2020-10-13 10:59:20,596 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:22,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:59:22,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:22,156 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:22,156 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:22,157 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:59:22,157 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:59:22,157 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:59:22,157 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:22,157 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:59:22,157 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:59:22,157 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:59:22,157 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:22,163 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:59:22,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [800856640] [2020-10-13 10:59:22,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:59:22,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-10-13 10:59:22,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143105796] [2020-10-13 10:59:22,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-10-13 10:59:22,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:59:22,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-10-13 10:59:22,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=1981, Unknown=0, NotChecked=0, Total=2070 [2020-10-13 10:59:22,164 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 46 states. [2020-10-13 10:59:25,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:59:25,282 INFO L93 Difference]: Finished difference Result 65 states and 65 transitions. [2020-10-13 10:59:25,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-10-13 10:59:25,283 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 56 [2020-10-13 10:59:25,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:59:25,284 INFO L225 Difference]: With dead ends: 65 [2020-10-13 10:59:25,284 INFO L226 Difference]: Without dead ends: 58 [2020-10-13 10:59:25,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=261, Invalid=7571, Unknown=0, NotChecked=0, Total=7832 [2020-10-13 10:59:25,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-10-13 10:59:25,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-10-13 10:59:25,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-10-13 10:59:25,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-10-13 10:59:25,291 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-10-13 10:59:25,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:59:25,291 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-10-13 10:59:25,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-10-13 10:59:25,291 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-10-13 10:59:25,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-10-13 10:59:25,292 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:59:25,292 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:59:25,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-10-13 10:59:25,292 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:59:25,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:59:25,292 INFO L82 PathProgramCache]: Analyzing trace with hash 576753078, now seen corresponding path program 43 times [2020-10-13 10:59:25,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:59:25,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [8407135] [2020-10-13 10:59:25,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:59:25,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:25,322 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:26,119 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:26,802 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:26,802 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 65 [2020-10-13 10:59:26,803 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:59:26,803 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1491 [2020-10-13 10:59:26,803 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:26,803 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 45 [2020-10-13 10:59:26,803 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:59:26,803 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 47 [2020-10-13 10:59:26,804 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:28,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:59:28,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:28,413 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:28,414 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:28,414 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:59:28,414 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:59:28,414 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:59:28,414 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:28,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:59:28,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:59:28,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:59:28,415 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:28,420 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:59:28,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [8407135] [2020-10-13 10:59:28,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:59:28,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-10-13 10:59:28,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338946233] [2020-10-13 10:59:28,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-10-13 10:59:28,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:59:28,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-10-13 10:59:28,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=2071, Unknown=0, NotChecked=0, Total=2162 [2020-10-13 10:59:28,422 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 47 states. [2020-10-13 10:59:31,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:59:31,595 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-10-13 10:59:31,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-10-13 10:59:31,596 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 57 [2020-10-13 10:59:31,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:59:31,597 INFO L225 Difference]: With dead ends: 66 [2020-10-13 10:59:31,597 INFO L226 Difference]: Without dead ends: 59 [2020-10-13 10:59:31,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 946 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=267, Invalid=7923, Unknown=0, NotChecked=0, Total=8190 [2020-10-13 10:59:31,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-10-13 10:59:31,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-10-13 10:59:31,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-10-13 10:59:31,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-10-13 10:59:31,606 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-10-13 10:59:31,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:59:31,607 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-10-13 10:59:31,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-10-13 10:59:31,607 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-10-13 10:59:31,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-10-13 10:59:31,610 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:59:31,610 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:59:31,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-10-13 10:59:31,613 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:59:31,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:59:31,613 INFO L82 PathProgramCache]: Analyzing trace with hash -1362049772, now seen corresponding path program 44 times [2020-10-13 10:59:31,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:59:31,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290637191] [2020-10-13 10:59:31,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:59:31,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:31,653 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:32,584 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:32,927 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:32,927 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 66 [2020-10-13 10:59:32,927 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:59:32,927 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1287 [2020-10-13 10:59:32,927 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:32,928 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 46 [2020-10-13 10:59:32,928 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:59:32,928 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 48 [2020-10-13 10:59:32,928 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:34,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:59:34,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:34,588 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:34,589 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:34,589 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:59:34,589 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:59:34,589 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:59:34,590 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:34,590 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:59:34,590 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:59:34,590 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:59:34,590 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:34,597 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:59:34,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290637191] [2020-10-13 10:59:34,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:59:34,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-10-13 10:59:34,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100016366] [2020-10-13 10:59:34,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-10-13 10:59:34,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:59:34,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-10-13 10:59:34,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=2163, Unknown=0, NotChecked=0, Total=2256 [2020-10-13 10:59:34,599 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 48 states. [2020-10-13 10:59:37,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:59:37,998 INFO L93 Difference]: Finished difference Result 67 states and 67 transitions. [2020-10-13 10:59:37,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-10-13 10:59:37,999 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 58 [2020-10-13 10:59:38,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:59:38,000 INFO L225 Difference]: With dead ends: 67 [2020-10-13 10:59:38,000 INFO L226 Difference]: Without dead ends: 60 [2020-10-13 10:59:38,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 990 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=273, Invalid=8283, Unknown=0, NotChecked=0, Total=8556 [2020-10-13 10:59:38,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-10-13 10:59:38,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-10-13 10:59:38,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-10-13 10:59:38,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2020-10-13 10:59:38,005 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 58 [2020-10-13 10:59:38,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:59:38,006 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2020-10-13 10:59:38,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-10-13 10:59:38,006 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2020-10-13 10:59:38,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-10-13 10:59:38,006 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:59:38,006 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:59:38,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-10-13 10:59:38,007 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:59:38,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:59:38,007 INFO L82 PathProgramCache]: Analyzing trace with hash -1335395978, now seen corresponding path program 45 times [2020-10-13 10:59:38,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:59:38,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029814613] [2020-10-13 10:59:38,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:59:38,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:38,034 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:38,956 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:39,594 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:39,594 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 67 [2020-10-13 10:59:39,595 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:59:39,595 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1572 [2020-10-13 10:59:39,595 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:39,595 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 47 [2020-10-13 10:59:39,595 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:59:39,595 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 49 [2020-10-13 10:59:39,595 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:41,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:59:41,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:41,324 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:41,324 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:41,325 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:59:41,325 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:59:41,325 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:59:41,325 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:41,325 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:59:41,325 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:59:41,326 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:59:41,326 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:41,334 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:59:41,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029814613] [2020-10-13 10:59:41,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:59:41,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-10-13 10:59:41,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869667842] [2020-10-13 10:59:41,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-10-13 10:59:41,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:59:41,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-10-13 10:59:41,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=2257, Unknown=0, NotChecked=0, Total=2352 [2020-10-13 10:59:41,335 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 49 states. [2020-10-13 10:59:44,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:59:44,827 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-10-13 10:59:44,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-10-13 10:59:44,828 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 59 [2020-10-13 10:59:44,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:59:44,829 INFO L225 Difference]: With dead ends: 68 [2020-10-13 10:59:44,829 INFO L226 Difference]: Without dead ends: 61 [2020-10-13 10:59:44,830 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1035 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=279, Invalid=8651, Unknown=0, NotChecked=0, Total=8930 [2020-10-13 10:59:44,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-10-13 10:59:44,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-10-13 10:59:44,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-10-13 10:59:44,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-10-13 10:59:44,835 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 59 [2020-10-13 10:59:44,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:59:44,835 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-10-13 10:59:44,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-10-13 10:59:44,836 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-10-13 10:59:44,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-10-13 10:59:44,836 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:59:44,836 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:59:44,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-10-13 10:59:44,836 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:59:44,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:59:44,837 INFO L82 PathProgramCache]: Analyzing trace with hash -509128364, now seen corresponding path program 46 times [2020-10-13 10:59:44,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:59:44,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1634708519] [2020-10-13 10:59:44,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:59:44,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:44,866 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:45,620 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:47,391 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:47,392 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 68 [2020-10-13 10:59:47,392 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:59:47,392 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2537 [2020-10-13 10:59:47,392 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:47,392 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 48 [2020-10-13 10:59:47,393 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:59:47,393 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 50 [2020-10-13 10:59:47,393 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:49,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:59:49,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:49,254 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:49,255 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:49,255 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:59:49,255 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:59:49,255 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:59:49,255 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:49,256 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:59:49,256 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:59:49,256 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:59:49,256 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:49,263 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:59:49,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1634708519] [2020-10-13 10:59:49,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:59:49,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-10-13 10:59:49,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975356529] [2020-10-13 10:59:49,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-10-13 10:59:49,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:59:49,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-10-13 10:59:49,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=2353, Unknown=0, NotChecked=0, Total=2450 [2020-10-13 10:59:49,265 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 50 states. [2020-10-13 10:59:52,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:59:52,969 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2020-10-13 10:59:52,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-10-13 10:59:52,970 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 60 [2020-10-13 10:59:52,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:59:52,971 INFO L225 Difference]: With dead ends: 69 [2020-10-13 10:59:52,971 INFO L226 Difference]: Without dead ends: 62 [2020-10-13 10:59:52,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1081 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=285, Invalid=9027, Unknown=0, NotChecked=0, Total=9312 [2020-10-13 10:59:52,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-10-13 10:59:52,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2020-10-13 10:59:52,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-10-13 10:59:52,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 62 transitions. [2020-10-13 10:59:52,977 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 62 transitions. Word has length 60 [2020-10-13 10:59:52,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:59:52,978 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 62 transitions. [2020-10-13 10:59:52,978 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-10-13 10:59:52,978 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 62 transitions. [2020-10-13 10:59:52,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-10-13 10:59:52,979 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:59:52,979 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:59:52,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-10-13 10:59:52,979 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:59:52,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:59:52,979 INFO L82 PathProgramCache]: Analyzing trace with hash -664636106, now seen corresponding path program 47 times [2020-10-13 10:59:52,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:59:52,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233268363] [2020-10-13 10:59:52,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:59:53,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:53,016 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:54,135 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:55,150 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:55,150 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 69 [2020-10-13 10:59:55,150 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:59:55,150 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2146 [2020-10-13 10:59:55,150 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:55,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 49 [2020-10-13 10:59:55,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:59:55,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 51 [2020-10-13 10:59:55,151 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:57,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:59:57,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:59:57,086 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:59:57,086 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:59:57,087 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 10:59:57,087 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:59:57,087 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:59:57,087 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:59:57,087 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:59:57,087 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:59:57,088 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:59:57,088 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:59:57,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:59:57,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233268363] [2020-10-13 10:59:57,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:59:57,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-10-13 10:59:57,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094876774] [2020-10-13 10:59:57,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-10-13 10:59:57,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:59:57,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-10-13 10:59:57,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=2451, Unknown=0, NotChecked=0, Total=2550 [2020-10-13 10:59:57,096 INFO L87 Difference]: Start difference. First operand 62 states and 62 transitions. Second operand 51 states. [2020-10-13 11:00:00,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:00:00,903 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-10-13 11:00:00,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-10-13 11:00:00,904 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 61 [2020-10-13 11:00:00,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:00:00,905 INFO L225 Difference]: With dead ends: 70 [2020-10-13 11:00:00,905 INFO L226 Difference]: Without dead ends: 63 [2020-10-13 11:00:00,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1128 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=291, Invalid=9411, Unknown=0, NotChecked=0, Total=9702 [2020-10-13 11:00:00,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-10-13 11:00:00,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-10-13 11:00:00,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-10-13 11:00:00,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-10-13 11:00:00,911 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 61 [2020-10-13 11:00:00,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:00:00,911 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-10-13 11:00:00,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-10-13 11:00:00,911 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-10-13 11:00:00,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-10-13 11:00:00,912 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:00:00,912 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:00:00,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-10-13 11:00:00,912 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:00:00,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:00:00,913 INFO L82 PathProgramCache]: Analyzing trace with hash -1190408812, now seen corresponding path program 48 times [2020-10-13 11:00:00,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:00:00,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56624603] [2020-10-13 11:00:00,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:00:00,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:00,943 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:01,823 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:03,252 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:03,252 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 70 [2020-10-13 11:00:03,252 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:00:03,252 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2321 [2020-10-13 11:00:03,252 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:03,252 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 50 [2020-10-13 11:00:03,253 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 11:00:03,253 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 52 [2020-10-13 11:00:03,253 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:05,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:00:05,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:05,231 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:05,231 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:05,232 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:00:05,232 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:00:05,232 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 11:00:05,232 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:05,232 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:00:05,232 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:00:05,232 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:00:05,232 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:05,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1176 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:00:05,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56624603] [2020-10-13 11:00:05,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:00:05,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-10-13 11:00:05,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781766533] [2020-10-13 11:00:05,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-10-13 11:00:05,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:00:05,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-10-13 11:00:05,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=2551, Unknown=0, NotChecked=0, Total=2652 [2020-10-13 11:00:05,240 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 52 states. [2020-10-13 11:00:09,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:00:09,816 INFO L93 Difference]: Finished difference Result 71 states and 71 transitions. [2020-10-13 11:00:09,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-10-13 11:00:09,817 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 62 [2020-10-13 11:00:09,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:00:09,818 INFO L225 Difference]: With dead ends: 71 [2020-10-13 11:00:09,818 INFO L226 Difference]: Without dead ends: 64 [2020-10-13 11:00:09,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=393, Invalid=9707, Unknown=0, NotChecked=0, Total=10100 [2020-10-13 11:00:09,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-10-13 11:00:09,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-10-13 11:00:09,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-10-13 11:00:09,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 64 transitions. [2020-10-13 11:00:09,825 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 64 transitions. Word has length 62 [2020-10-13 11:00:09,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:00:09,825 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 64 transitions. [2020-10-13 11:00:09,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-10-13 11:00:09,825 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 64 transitions. [2020-10-13 11:00:09,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-10-13 11:00:09,826 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:00:09,826 INFO L422 BasicCegarLoop]: trace histogram [49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:00:09,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-10-13 11:00:09,826 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:00:09,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:00:09,827 INFO L82 PathProgramCache]: Analyzing trace with hash -309493514, now seen corresponding path program 49 times [2020-10-13 11:00:09,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:00:09,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506914999] [2020-10-13 11:00:09,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:00:09,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:09,860 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:10,853 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:11,810 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:11,810 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 71 [2020-10-13 11:00:11,810 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:00:11,810 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1964 [2020-10-13 11:00:11,810 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:11,810 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 51 [2020-10-13 11:00:11,810 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 11:00:11,810 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 53 [2020-10-13 11:00:11,811 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:13,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:00:13,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:13,917 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:13,918 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:13,918 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:00:13,919 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:00:13,919 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 11:00:13,919 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:13,919 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:00:13,919 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:00:13,919 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:00:13,919 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:13,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:00:13,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506914999] [2020-10-13 11:00:13,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:00:13,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-10-13 11:00:13,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354383507] [2020-10-13 11:00:13,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-10-13 11:00:13,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:00:13,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-10-13 11:00:13,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=2653, Unknown=0, NotChecked=0, Total=2756 [2020-10-13 11:00:13,928 INFO L87 Difference]: Start difference. First operand 64 states and 64 transitions. Second operand 53 states. [2020-10-13 11:00:17,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:00:17,923 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-10-13 11:00:17,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-10-13 11:00:17,924 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 63 [2020-10-13 11:00:17,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:00:17,925 INFO L225 Difference]: With dead ends: 72 [2020-10-13 11:00:17,925 INFO L226 Difference]: Without dead ends: 65 [2020-10-13 11:00:17,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=303, Invalid=10203, Unknown=0, NotChecked=0, Total=10506 [2020-10-13 11:00:17,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-10-13 11:00:17,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2020-10-13 11:00:17,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-10-13 11:00:17,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-10-13 11:00:17,930 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 63 [2020-10-13 11:00:17,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:00:17,930 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-10-13 11:00:17,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-10-13 11:00:17,930 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-10-13 11:00:17,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-10-13 11:00:17,931 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:00:17,931 INFO L422 BasicCegarLoop]: trace histogram [50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:00:17,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-10-13 11:00:17,931 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:00:17,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:00:17,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1229076948, now seen corresponding path program 50 times [2020-10-13 11:00:17,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:00:17,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1103615221] [2020-10-13 11:00:17,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:00:17,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:17,965 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:19,318 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:19,385 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:19,385 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-13 11:00:19,385 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:00:19,386 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1434 [2020-10-13 11:00:19,386 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:19,386 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 52 [2020-10-13 11:00:19,386 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 11:00:19,386 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 54 [2020-10-13 11:00:19,386 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:21,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:00:21,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:21,596 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:21,596 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:21,596 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:00:21,597 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:00:21,597 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 11:00:21,597 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:21,597 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:00:21,597 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:00:21,597 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:00:21,597 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:21,604 INFO L134 CoverageAnalysis]: Checked inductivity of 1275 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:00:21,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1103615221] [2020-10-13 11:00:21,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:00:21,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-10-13 11:00:21,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450525575] [2020-10-13 11:00:21,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-10-13 11:00:21,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:00:21,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-10-13 11:00:21,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=2757, Unknown=0, NotChecked=0, Total=2862 [2020-10-13 11:00:21,606 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 54 states. [2020-10-13 11:00:25,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:00:25,784 INFO L93 Difference]: Finished difference Result 73 states and 73 transitions. [2020-10-13 11:00:25,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-10-13 11:00:25,784 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 64 [2020-10-13 11:00:25,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:00:25,785 INFO L225 Difference]: With dead ends: 73 [2020-10-13 11:00:25,786 INFO L226 Difference]: Without dead ends: 66 [2020-10-13 11:00:25,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1275 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=309, Invalid=10611, Unknown=0, NotChecked=0, Total=10920 [2020-10-13 11:00:25,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-10-13 11:00:25,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-10-13 11:00:25,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-10-13 11:00:25,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2020-10-13 11:00:25,793 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 64 [2020-10-13 11:00:25,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:00:25,793 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2020-10-13 11:00:25,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-10-13 11:00:25,793 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2020-10-13 11:00:25,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-10-13 11:00:25,794 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:00:25,794 INFO L422 BasicCegarLoop]: trace histogram [51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:00:25,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-10-13 11:00:25,794 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:00:25,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:00:25,795 INFO L82 PathProgramCache]: Analyzing trace with hash 1680121014, now seen corresponding path program 51 times [2020-10-13 11:00:25,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:00:25,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [701772240] [2020-10-13 11:00:25,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:00:25,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:25,828 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:27,183 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:27,320 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:27,321 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 73 [2020-10-13 11:00:27,321 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:00:27,321 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1507 [2020-10-13 11:00:27,321 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:27,321 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 53 [2020-10-13 11:00:27,321 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 11:00:27,322 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 55 [2020-10-13 11:00:27,322 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:29,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:00:29,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:29,661 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:29,661 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:29,661 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:00:29,661 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:00:29,661 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 11:00:29,662 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:29,662 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:00:29,662 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:00:29,662 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:00:29,662 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:29,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1326 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:00:29,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [701772240] [2020-10-13 11:00:29,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:00:29,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-10-13 11:00:29,672 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089079267] [2020-10-13 11:00:29,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-10-13 11:00:29,672 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:00:29,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-10-13 11:00:29,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=2863, Unknown=0, NotChecked=0, Total=2970 [2020-10-13 11:00:29,673 INFO L87 Difference]: Start difference. First operand 66 states and 66 transitions. Second operand 55 states. [2020-10-13 11:00:34,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:00:34,166 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-10-13 11:00:34,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-10-13 11:00:34,167 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 65 [2020-10-13 11:00:34,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:00:34,168 INFO L225 Difference]: With dead ends: 74 [2020-10-13 11:00:34,168 INFO L226 Difference]: Without dead ends: 67 [2020-10-13 11:00:34,168 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1326 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=315, Invalid=11027, Unknown=0, NotChecked=0, Total=11342 [2020-10-13 11:00:34,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-10-13 11:00:34,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-10-13 11:00:34,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-10-13 11:00:34,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-10-13 11:00:34,174 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 65 [2020-10-13 11:00:34,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:00:34,174 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-10-13 11:00:34,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-10-13 11:00:34,175 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-10-13 11:00:34,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-10-13 11:00:34,175 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:00:34,175 INFO L422 BasicCegarLoop]: trace histogram [52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:00:34,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-10-13 11:00:34,176 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:00:34,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:00:34,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1517382124, now seen corresponding path program 52 times [2020-10-13 11:00:34,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:00:34,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474521189] [2020-10-13 11:00:34,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:00:34,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:34,216 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:35,736 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:35,878 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:35,878 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 74 [2020-10-13 11:00:35,878 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:00:35,878 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1680 [2020-10-13 11:00:35,878 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:35,879 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 54 [2020-10-13 11:00:35,879 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 11:00:35,879 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 56 [2020-10-13 11:00:35,879 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:38,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:00:38,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:38,264 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:38,265 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:38,265 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:00:38,265 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:00:38,265 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 11:00:38,265 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:38,265 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:00:38,266 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:00:38,266 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:00:38,266 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:38,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1378 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:00:38,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474521189] [2020-10-13 11:00:38,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:00:38,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-10-13 11:00:38,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140968615] [2020-10-13 11:00:38,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-10-13 11:00:38,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:00:38,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-10-13 11:00:38,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=2971, Unknown=0, NotChecked=0, Total=3080 [2020-10-13 11:00:38,274 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 56 states. [2020-10-13 11:00:42,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:00:42,624 INFO L93 Difference]: Finished difference Result 75 states and 75 transitions. [2020-10-13 11:00:42,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-10-13 11:00:42,624 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 66 [2020-10-13 11:00:42,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:00:42,625 INFO L225 Difference]: With dead ends: 75 [2020-10-13 11:00:42,625 INFO L226 Difference]: Without dead ends: 68 [2020-10-13 11:00:42,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1378 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=321, Invalid=11451, Unknown=0, NotChecked=0, Total=11772 [2020-10-13 11:00:42,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-10-13 11:00:42,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-10-13 11:00:42,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-10-13 11:00:42,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 68 transitions. [2020-10-13 11:00:42,631 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 68 transitions. Word has length 66 [2020-10-13 11:00:42,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:00:42,631 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 68 transitions. [2020-10-13 11:00:42,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-10-13 11:00:42,631 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 68 transitions. [2020-10-13 11:00:42,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-10-13 11:00:42,632 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:00:42,632 INFO L422 BasicCegarLoop]: trace histogram [53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:00:42,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-10-13 11:00:42,632 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:00:42,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:00:42,633 INFO L82 PathProgramCache]: Analyzing trace with hash -1855731594, now seen corresponding path program 53 times [2020-10-13 11:00:42,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:00:42,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70684996] [2020-10-13 11:00:42,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:00:42,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:42,667 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:44,179 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:44,684 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:44,684 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 75 [2020-10-13 11:00:44,684 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:00:44,684 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2032 [2020-10-13 11:00:44,684 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:44,684 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 55 [2020-10-13 11:00:44,684 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 11:00:44,684 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 57 [2020-10-13 11:00:44,685 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:47,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:00:47,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:47,120 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:47,120 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:47,121 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:00:47,121 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:00:47,121 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 11:00:47,121 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:47,121 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:00:47,121 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:00:47,121 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:00:47,121 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:47,129 INFO L134 CoverageAnalysis]: Checked inductivity of 1431 backedges. 0 proven. 1431 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:00:47,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70684996] [2020-10-13 11:00:47,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:00:47,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-10-13 11:00:47,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792285882] [2020-10-13 11:00:47,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-10-13 11:00:47,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:00:47,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-10-13 11:00:47,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=3081, Unknown=0, NotChecked=0, Total=3192 [2020-10-13 11:00:47,130 INFO L87 Difference]: Start difference. First operand 68 states and 68 transitions. Second operand 57 states. [2020-10-13 11:00:51,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:00:51,784 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-10-13 11:00:51,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-10-13 11:00:51,785 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 67 [2020-10-13 11:00:51,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:00:51,787 INFO L225 Difference]: With dead ends: 76 [2020-10-13 11:00:51,787 INFO L226 Difference]: Without dead ends: 69 [2020-10-13 11:00:51,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1431 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=327, Invalid=11883, Unknown=0, NotChecked=0, Total=12210 [2020-10-13 11:00:51,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-10-13 11:00:51,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2020-10-13 11:00:51,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-10-13 11:00:51,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-10-13 11:00:51,794 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 67 [2020-10-13 11:00:51,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:00:51,795 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-10-13 11:00:51,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-10-13 11:00:51,795 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-10-13 11:00:51,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-10-13 11:00:51,795 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:00:51,796 INFO L422 BasicCegarLoop]: trace histogram [54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:00:51,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-10-13 11:00:51,796 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:00:51,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:00:51,796 INFO L82 PathProgramCache]: Analyzing trace with hash 540336724, now seen corresponding path program 54 times [2020-10-13 11:00:51,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:00:51,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171976091] [2020-10-13 11:00:51,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:00:51,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:51,834 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:52,936 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:55,252 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:55,252 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 76 [2020-10-13 11:00:55,252 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:00:55,252 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3433 [2020-10-13 11:00:55,253 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:55,253 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 56 [2020-10-13 11:00:55,253 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 11:00:55,253 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 58 [2020-10-13 11:00:55,253 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:57,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:00:57,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:00:57,826 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:00:57,826 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:00:57,826 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:00:57,826 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:00:57,827 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 11:00:57,827 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:00:57,827 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:00:57,827 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:00:57,827 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:00:57,827 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:00:57,835 INFO L134 CoverageAnalysis]: Checked inductivity of 1485 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:00:57,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171976091] [2020-10-13 11:00:57,835 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:00:57,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-10-13 11:00:57,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386123494] [2020-10-13 11:00:57,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-10-13 11:00:57,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:00:57,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-10-13 11:00:57,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=3193, Unknown=0, NotChecked=0, Total=3306 [2020-10-13 11:00:57,837 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 58 states. [2020-10-13 11:01:02,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:01:02,597 INFO L93 Difference]: Finished difference Result 77 states and 77 transitions. [2020-10-13 11:01:02,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-10-13 11:01:02,598 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 68 [2020-10-13 11:01:02,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:01:02,600 INFO L225 Difference]: With dead ends: 77 [2020-10-13 11:01:02,600 INFO L226 Difference]: Without dead ends: 70 [2020-10-13 11:01:02,601 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1485 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=333, Invalid=12323, Unknown=0, NotChecked=0, Total=12656 [2020-10-13 11:01:02,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-10-13 11:01:02,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-10-13 11:01:02,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-10-13 11:01:02,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 70 transitions. [2020-10-13 11:01:02,607 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 70 transitions. Word has length 68 [2020-10-13 11:01:02,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:01:02,607 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 70 transitions. [2020-10-13 11:01:02,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-10-13 11:01:02,607 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 70 transitions. [2020-10-13 11:01:02,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-10-13 11:01:02,608 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:01:02,608 INFO L422 BasicCegarLoop]: trace histogram [55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:01:02,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-10-13 11:01:02,608 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:01:02,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:01:02,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1804010550, now seen corresponding path program 55 times [2020-10-13 11:01:02,609 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:01:02,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772333419] [2020-10-13 11:01:02,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:01:02,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:01:02,646 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:01:03,890 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:01:05,964 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:01:05,964 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 77 [2020-10-13 11:01:05,965 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:01:05,965 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3334 [2020-10-13 11:01:05,965 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:01:05,965 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 57 [2020-10-13 11:01:05,965 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 11:01:05,965 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 59 [2020-10-13 11:01:05,965 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:01:08,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:01:08,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:01:08,637 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:01:08,638 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:01:08,638 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:01:08,638 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:01:08,638 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 11:01:08,638 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:01:08,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:01:08,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:01:08,639 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:01:08,639 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:01:08,646 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1540 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:01:08,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772333419] [2020-10-13 11:01:08,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:01:08,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-10-13 11:01:08,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194145079] [2020-10-13 11:01:08,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-10-13 11:01:08,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:01:08,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-10-13 11:01:08,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=3307, Unknown=0, NotChecked=0, Total=3422 [2020-10-13 11:01:08,648 INFO L87 Difference]: Start difference. First operand 70 states and 70 transitions. Second operand 59 states. [2020-10-13 11:01:13,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:01:13,554 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-10-13 11:01:13,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-10-13 11:01:13,555 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 69 [2020-10-13 11:01:13,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:01:13,556 INFO L225 Difference]: With dead ends: 78 [2020-10-13 11:01:13,556 INFO L226 Difference]: Without dead ends: 71 [2020-10-13 11:01:13,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1540 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=339, Invalid=12771, Unknown=0, NotChecked=0, Total=13110 [2020-10-13 11:01:13,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-10-13 11:01:13,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2020-10-13 11:01:13,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-10-13 11:01:13,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-10-13 11:01:13,563 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 69 [2020-10-13 11:01:13,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:01:13,563 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-10-13 11:01:13,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-10-13 11:01:13,563 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-10-13 11:01:13,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-10-13 11:01:13,564 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:01:13,564 INFO L422 BasicCegarLoop]: trace histogram [56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:01:13,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-10-13 11:01:13,564 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:01:13,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:01:13,565 INFO L82 PathProgramCache]: Analyzing trace with hash -1971773804, now seen corresponding path program 56 times [2020-10-13 11:01:13,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:01:13,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [815500923] [2020-10-13 11:01:13,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:01:13,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:01:13,617 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:01:15,520 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:01:16,060 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:01:16,060 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 78 [2020-10-13 11:01:16,061 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:01:16,061 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2467 [2020-10-13 11:01:16,061 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:01:16,061 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 58 [2020-10-13 11:01:16,061 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 11:01:16,061 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 60 [2020-10-13 11:01:16,061 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:01:18,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:01:18,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:01:18,814 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:01:18,815 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:01:18,815 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:01:18,815 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:01:18,815 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 11:01:18,815 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:01:18,816 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:01:18,816 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:01:18,816 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:01:18,816 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:01:18,824 INFO L134 CoverageAnalysis]: Checked inductivity of 1596 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:01:18,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [815500923] [2020-10-13 11:01:18,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:01:18,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-10-13 11:01:18,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110319115] [2020-10-13 11:01:18,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-10-13 11:01:18,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:01:18,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-10-13 11:01:18,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=3423, Unknown=0, NotChecked=0, Total=3540 [2020-10-13 11:01:18,825 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 60 states. [2020-10-13 11:01:23,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 11:01:23,905 INFO L93 Difference]: Finished difference Result 79 states and 79 transitions. [2020-10-13 11:01:23,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-10-13 11:01:23,906 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 70 [2020-10-13 11:01:23,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 11:01:23,907 INFO L225 Difference]: With dead ends: 79 [2020-10-13 11:01:23,908 INFO L226 Difference]: Without dead ends: 72 [2020-10-13 11:01:23,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1596 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=345, Invalid=13227, Unknown=0, NotChecked=0, Total=13572 [2020-10-13 11:01:23,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-10-13 11:01:23,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-10-13 11:01:23,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-10-13 11:01:23,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 72 transitions. [2020-10-13 11:01:23,915 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 72 transitions. Word has length 70 [2020-10-13 11:01:23,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 11:01:23,915 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 72 transitions. [2020-10-13 11:01:23,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-10-13 11:01:23,915 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 72 transitions. [2020-10-13 11:01:23,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-10-13 11:01:23,916 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 11:01:23,916 INFO L422 BasicCegarLoop]: trace histogram [57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 11:01:23,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-10-13 11:01:23,916 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 11:01:23,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 11:01:23,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1237995510, now seen corresponding path program 57 times [2020-10-13 11:01:23,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 11:01:23,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429887829] [2020-10-13 11:01:23,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 11:01:23,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:01:23,962 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:01:25,841 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:01:26,135 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:01:26,136 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 79 [2020-10-13 11:01:26,136 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 11:01:26,136 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2190 [2020-10-13 11:01:26,136 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:01:26,136 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 59 [2020-10-13 11:01:26,136 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 11:01:26,136 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 61 [2020-10-13 11:01:26,137 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:01:29,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 11:01:29,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 11:01:29,088 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 11:01:29,089 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 11:01:29,089 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 11:01:29,089 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 11:01:29,089 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 11:01:29,090 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 11:01:29,090 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 11:01:29,090 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 11:01:29,090 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 11:01:29,090 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 11:01:29,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1653 backedges. 0 proven. 1653 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 11:01:29,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [429887829] [2020-10-13 11:01:29,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 11:01:29,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-10-13 11:01:29,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739171475] [2020-10-13 11:01:29,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-10-13 11:01:29,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 11:01:29,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-10-13 11:01:29,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=3541, Unknown=0, NotChecked=0, Total=3660 [2020-10-13 11:01:29,100 INFO L87 Difference]: Start difference. First operand 72 states and 72 transitions. Second operand 61 states.