/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/array-examples/standard_two_index_02.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-13 05:01:42,559 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-13 05:01:42,563 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-13 05:01:42,607 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-13 05:01:42,607 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-13 05:01:42,615 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-13 05:01:42,617 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-13 05:01:42,619 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-13 05:01:42,621 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-13 05:01:42,623 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-13 05:01:42,624 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-13 05:01:42,626 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-13 05:01:42,627 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-13 05:01:42,630 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-13 05:01:42,632 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-13 05:01:42,634 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-13 05:01:42,635 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-13 05:01:42,636 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-13 05:01:42,638 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-13 05:01:42,645 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-13 05:01:42,648 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-13 05:01:42,650 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-13 05:01:42,651 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-13 05:01:42,652 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-13 05:01:42,662 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-13 05:01:42,662 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-13 05:01:42,663 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-13 05:01:42,666 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-13 05:01:42,666 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-13 05:01:42,669 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-13 05:01:42,669 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-13 05:01:42,670 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-13 05:01:42,671 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-13 05:01:42,672 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-13 05:01:42,673 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-13 05:01:42,673 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-13 05:01:42,673 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-13 05:01:42,674 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-13 05:01:42,674 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-13 05:01:42,677 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-13 05:01:42,677 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-13 05:01:42,678 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 05:01:42,720 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-13 05:01:42,721 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-13 05:01:42,723 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-13 05:01:42,723 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-13 05:01:42,723 INFO L138 SettingsManager]: * Use SBE=true [2020-10-13 05:01:42,724 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-13 05:01:42,724 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-13 05:01:42,724 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-13 05:01:42,724 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-13 05:01:42,724 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-13 05:01:42,726 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-13 05:01:42,726 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-13 05:01:42,726 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-13 05:01:42,727 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-13 05:01:42,727 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-13 05:01:42,727 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-13 05:01:42,727 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-13 05:01:42,727 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-13 05:01:42,728 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-13 05:01:42,728 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-13 05:01:42,728 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-13 05:01:42,728 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-13 05:01:42,729 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-13 05:01:42,729 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-13 05:01:42,729 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-13 05:01:42,729 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-13 05:01:42,729 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-13 05:01:42,729 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-13 05:01:42,730 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-13 05:01:42,730 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 05:01:43,023 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-13 05:01:43,037 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-13 05:01:43,041 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-13 05:01:43,043 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-13 05:01:43,043 INFO L275 PluginConnector]: CDTParser initialized [2020-10-13 05:01:43,044 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_two_index_02.i [2020-10-13 05:01:43,103 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b5a5263c9/59c9c1ff747342b090727277807a123f/FLAG6a7529f0f [2020-10-13 05:01:43,594 INFO L306 CDTParser]: Found 1 translation units. [2020-10-13 05:01:43,594 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-examples/standard_two_index_02.i [2020-10-13 05:01:43,601 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b5a5263c9/59c9c1ff747342b090727277807a123f/FLAG6a7529f0f [2020-10-13 05:01:43,957 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b5a5263c9/59c9c1ff747342b090727277807a123f [2020-10-13 05:01:43,968 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-13 05:01:43,969 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-13 05:01:43,970 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-13 05:01:43,971 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-13 05:01:43,974 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-13 05:01:43,975 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:01:43" (1/1) ... [2020-10-13 05:01:43,978 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@582ac9d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:01:43, skipping insertion in model container [2020-10-13 05:01:43,978 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:01:43" (1/1) ... [2020-10-13 05:01:43,986 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-13 05:01:44,002 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-13 05:01:44,194 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 05:01:44,197 INFO L203 MainTranslator]: Completed pre-run [2020-10-13 05:01:44,217 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 05:01:44,237 INFO L208 MainTranslator]: Completed translation [2020-10-13 05:01:44,237 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:01:44 WrapperNode [2020-10-13 05:01:44,238 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-13 05:01:44,238 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-13 05:01:44,238 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-13 05:01:44,239 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-13 05:01:44,336 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:01:44" (1/1) ... [2020-10-13 05:01:44,336 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:01:44" (1/1) ... [2020-10-13 05:01:44,343 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:01:44" (1/1) ... [2020-10-13 05:01:44,343 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:01:44" (1/1) ... [2020-10-13 05:01:44,361 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:01:44" (1/1) ... [2020-10-13 05:01:44,368 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:01:44" (1/1) ... [2020-10-13 05:01:44,374 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:01:44" (1/1) ... [2020-10-13 05:01:44,376 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-13 05:01:44,377 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-13 05:01:44,377 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-13 05:01:44,377 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-13 05:01:44,378 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:01:44" (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 05:01:44,435 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-13 05:01:44,435 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-13 05:01:44,435 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-13 05:01:44,435 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-13 05:01:44,436 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-13 05:01:44,436 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-13 05:01:44,436 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-13 05:01:44,436 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-13 05:01:44,436 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-13 05:01:44,436 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-13 05:01:44,437 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-13 05:01:44,437 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-13 05:01:44,437 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-13 05:01:44,437 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-13 05:01:44,653 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-13 05:01:44,654 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-10-13 05:01:44,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:01:44 BoogieIcfgContainer [2020-10-13 05:01:44,657 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-13 05:01:44,659 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-13 05:01:44,659 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-13 05:01:44,662 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-13 05:01:44,662 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:01:43" (1/3) ... [2020-10-13 05:01:44,663 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36a5c873 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:01:44, skipping insertion in model container [2020-10-13 05:01:44,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:01:44" (2/3) ... [2020-10-13 05:01:44,664 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36a5c873 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:01:44, skipping insertion in model container [2020-10-13 05:01:44,664 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:01:44" (3/3) ... [2020-10-13 05:01:44,666 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_two_index_02.i [2020-10-13 05:01:44,677 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-13 05:01:44,684 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-13 05:01:44,704 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-13 05:01:44,742 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-13 05:01:44,743 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-13 05:01:44,743 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-13 05:01:44,743 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-13 05:01:44,744 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-13 05:01:44,744 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-13 05:01:44,744 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-13 05:01:44,744 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-13 05:01:44,769 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-10-13 05:01:44,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-13 05:01:44,775 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:44,776 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:44,777 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:44,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:44,784 INFO L82 PathProgramCache]: Analyzing trace with hash -2029643862, now seen corresponding path program 1 times [2020-10-13 05:01:44,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:44,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [588323149] [2020-10-13 05:01:44,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:44,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:44,926 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:44,978 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:45,172 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:45,173 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-13 05:01:45,173 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:01:45,173 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 265 [2020-10-13 05:01:45,177 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:45,177 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:45,178 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 05:01:45,178 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:45,178 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-10-13 05:01:45,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:45,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:45,268 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:45,275 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:45,275 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:45,276 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:45,276 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-10-13 05:01:45,276 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:45,277 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:45,277 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:45,277 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:45,278 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:01:45,285 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 05:01:45,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [588323149] [2020-10-13 05:01:45,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 05:01:45,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-13 05:01:45,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393778841] [2020-10-13 05:01:45,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-13 05:01:45,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:45,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-13 05:01:45,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-13 05:01:45,311 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 3 states. [2020-10-13 05:01:45,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:45,402 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-10-13 05:01:45,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-13 05:01:45,404 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-10-13 05:01:45,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:45,413 INFO L225 Difference]: With dead ends: 41 [2020-10-13 05:01:45,413 INFO L226 Difference]: Without dead ends: 19 [2020-10-13 05:01:45,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-13 05:01:45,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-10-13 05:01:45,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-10-13 05:01:45,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-10-13 05:01:45,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-10-13 05:01:45,457 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2020-10-13 05:01:45,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:45,457 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-10-13 05:01:45,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-13 05:01:45,458 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-10-13 05:01:45,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-13 05:01:45,459 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:45,459 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:45,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-13 05:01:45,459 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:45,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:45,460 INFO L82 PathProgramCache]: Analyzing trace with hash 905206694, now seen corresponding path program 1 times [2020-10-13 05:01:45,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:45,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1934960714] [2020-10-13 05:01:45,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:45,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:45,484 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:45,520 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:45,649 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:45,649 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 23 [2020-10-13 05:01:45,649 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:01:45,650 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 174 [2020-10-13 05:01:45,650 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:45,650 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 05:01:45,650 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:01:45,650 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 05:01:45,651 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:45,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:45,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:45,679 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:45,681 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:45,681 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:45,681 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:45,682 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:01:45,682 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:45,682 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:45,682 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:45,683 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:45,683 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:45,686 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 05:01:45,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1934960714] [2020-10-13 05:01:45,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 05:01:45,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-13 05:01:45,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600746140] [2020-10-13 05:01:45,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-13 05:01:45,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:45,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-13 05:01:45,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 05:01:45,690 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 4 states. [2020-10-13 05:01:45,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:45,747 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-10-13 05:01:45,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-13 05:01:45,747 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-10-13 05:01:45,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:45,748 INFO L225 Difference]: With dead ends: 32 [2020-10-13 05:01:45,749 INFO L226 Difference]: Without dead ends: 20 [2020-10-13 05:01:45,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 05:01:45,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-10-13 05:01:45,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-10-13 05:01:45,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-10-13 05:01:45,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-10-13 05:01:45,756 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2020-10-13 05:01:45,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:45,757 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-10-13 05:01:45,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-13 05:01:45,757 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-10-13 05:01:45,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-13 05:01:45,758 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:45,758 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:45,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-13 05:01:45,758 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:45,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:45,759 INFO L82 PathProgramCache]: Analyzing trace with hash -764882998, now seen corresponding path program 1 times [2020-10-13 05:01:45,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:45,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1763041192] [2020-10-13 05:01:45,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:45,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:45,782 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:45,804 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:45,911 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:45,911 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-10-13 05:01:45,912 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:01:45,912 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 134 [2020-10-13 05:01:45,912 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:45,912 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 05:01:45,913 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-10-13 05:01:45,913 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 05:01:45,913 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:45,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:45,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:45,944 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:45,945 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:45,945 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:45,946 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:45,946 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:01:45,946 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:45,946 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:45,946 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:45,946 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:45,947 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:45,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-13 05:01:45,949 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1763041192] [2020-10-13 05:01:45,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 05:01:45,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-13 05:01:45,950 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898842955] [2020-10-13 05:01:45,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-13 05:01:45,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:45,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-13 05:01:45,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 05:01:45,951 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 4 states. [2020-10-13 05:01:46,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:46,016 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2020-10-13 05:01:46,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-13 05:01:46,017 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-10-13 05:01:46,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:46,020 INFO L225 Difference]: With dead ends: 34 [2020-10-13 05:01:46,021 INFO L226 Difference]: Without dead ends: 24 [2020-10-13 05:01:46,021 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-13 05:01:46,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-13 05:01:46,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2020-10-13 05:01:46,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-10-13 05:01:46,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-10-13 05:01:46,032 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2020-10-13 05:01:46,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:46,032 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-10-13 05:01:46,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-13 05:01:46,033 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-10-13 05:01:46,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-13 05:01:46,033 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:46,033 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:46,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-13 05:01:46,034 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:46,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:46,034 INFO L82 PathProgramCache]: Analyzing trace with hash -59429947, now seen corresponding path program 1 times [2020-10-13 05:01:46,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:46,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105581091] [2020-10-13 05:01:46,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:46,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:46,049 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:46,061 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:46,150 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:46,355 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:46,355 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-10-13 05:01:46,355 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:01:46,355 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 310 [2020-10-13 05:01:46,356 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:46,356 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-13 05:01:46,356 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:01:46,356 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 3 [2020-10-13 05:01:46,356 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:46,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:46,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:46,393 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:46,397 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:46,398 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:46,398 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:46,398 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-13 05:01:46,398 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:46,399 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:46,399 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:46,399 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:46,401 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-13 05:01:46,406 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-13 05:01:46,407 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105581091] [2020-10-13 05:01:46,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:01:46,408 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 05:01:46,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549508543] [2020-10-13 05:01:46,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 05:01:46,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:46,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 05:01:46,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 05:01:46,410 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 5 states. [2020-10-13 05:01:46,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:46,515 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-10-13 05:01:46,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 05:01:46,516 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-10-13 05:01:46,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:46,517 INFO L225 Difference]: With dead ends: 38 [2020-10-13 05:01:46,517 INFO L226 Difference]: Without dead ends: 25 [2020-10-13 05:01:46,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 05:01:46,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-10-13 05:01:46,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-10-13 05:01:46,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-10-13 05:01:46,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-10-13 05:01:46,531 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2020-10-13 05:01:46,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:46,532 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-10-13 05:01:46,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 05:01:46,532 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-10-13 05:01:46,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-13 05:01:46,532 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:46,533 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:46,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-13 05:01:46,533 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:46,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:46,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1302144745, now seen corresponding path program 2 times [2020-10-13 05:01:46,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:46,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [597354089] [2020-10-13 05:01:46,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:46,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:46,552 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:46,571 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:46,715 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:47,030 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:47,030 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 26 [2020-10-13 05:01:47,030 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:01:47,030 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 483 [2020-10-13 05:01:47,031 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:47,031 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-13 05:01:47,031 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-13 05:01:47,031 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 3 [2020-10-13 05:01:47,031 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:47,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:47,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:47,069 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:47,072 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:47,072 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:47,072 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:47,073 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:01:47,073 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:47,073 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:47,074 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:47,074 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:47,074 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:01:47,078 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-10-13 05:01:47,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [597354089] [2020-10-13 05:01:47,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:01:47,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 05:01:47,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810633105] [2020-10-13 05:01:47,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 05:01:47,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:47,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 05:01:47,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 05:01:47,081 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 5 states. [2020-10-13 05:01:47,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:47,177 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-10-13 05:01:47,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 05:01:47,178 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2020-10-13 05:01:47,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:47,180 INFO L225 Difference]: With dead ends: 39 [2020-10-13 05:01:47,180 INFO L226 Difference]: Without dead ends: 29 [2020-10-13 05:01:47,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-13 05:01:47,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-10-13 05:01:47,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 23. [2020-10-13 05:01:47,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-13 05:01:47,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-10-13 05:01:47,191 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 18 [2020-10-13 05:01:47,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:47,191 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-10-13 05:01:47,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 05:01:47,192 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-10-13 05:01:47,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-10-13 05:01:47,193 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:47,193 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:47,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-13 05:01:47,193 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:47,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:47,194 INFO L82 PathProgramCache]: Analyzing trace with hash -406079354, now seen corresponding path program 3 times [2020-10-13 05:01:47,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:47,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076025393] [2020-10-13 05:01:47,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:47,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:47,210 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:47,230 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:47,400 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:47,545 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:47,545 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 27 [2020-10-13 05:01:47,545 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:01:47,546 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 338 [2020-10-13 05:01:47,546 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:47,546 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 05:01:47,546 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-13 05:01:47,546 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-13 05:01:47,547 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:47,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:47,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:47,607 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:47,609 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:47,610 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:47,610 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:47,610 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:01:47,610 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:47,611 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:47,611 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:47,611 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:47,611 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:47,614 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-10-13 05:01:47,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1076025393] [2020-10-13 05:01:47,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:01:47,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-13 05:01:47,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793044381] [2020-10-13 05:01:47,618 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-13 05:01:47,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:47,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-13 05:01:47,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-13 05:01:47,619 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 6 states. [2020-10-13 05:01:47,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:47,735 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-10-13 05:01:47,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-13 05:01:47,736 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-10-13 05:01:47,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:47,737 INFO L225 Difference]: With dead ends: 48 [2020-10-13 05:01:47,737 INFO L226 Difference]: Without dead ends: 34 [2020-10-13 05:01:47,740 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-13 05:01:47,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-13 05:01:47,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2020-10-13 05:01:47,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-10-13 05:01:47,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-10-13 05:01:47,754 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 19 [2020-10-13 05:01:47,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:47,754 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-10-13 05:01:47,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-13 05:01:47,754 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-10-13 05:01:47,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-13 05:01:47,757 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:47,758 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:47,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-13 05:01:47,758 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:47,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:47,759 INFO L82 PathProgramCache]: Analyzing trace with hash -820912923, now seen corresponding path program 4 times [2020-10-13 05:01:47,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:47,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274419281] [2020-10-13 05:01:47,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:47,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:47,772 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:47,793 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:48,036 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:48,350 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:48,351 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 29 [2020-10-13 05:01:48,351 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:01:48,351 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 581 [2020-10-13 05:01:48,351 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:48,351 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-13 05:01:48,352 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:01:48,352 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-13 05:01:48,352 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:48,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:48,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:48,405 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:48,407 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:48,408 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:48,408 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:48,408 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:01:48,408 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:48,409 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:48,409 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:48,409 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:48,409 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:48,411 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-10-13 05:01:48,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274419281] [2020-10-13 05:01:48,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:01:48,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-13 05:01:48,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174527435] [2020-10-13 05:01:48,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-13 05:01:48,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:48,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-13 05:01:48,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-13 05:01:48,414 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 7 states. [2020-10-13 05:01:48,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:48,509 INFO L93 Difference]: Finished difference Result 47 states and 53 transitions. [2020-10-13 05:01:48,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-13 05:01:48,510 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-10-13 05:01:48,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:48,511 INFO L225 Difference]: With dead ends: 47 [2020-10-13 05:01:48,511 INFO L226 Difference]: Without dead ends: 32 [2020-10-13 05:01:48,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-13 05:01:48,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-10-13 05:01:48,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 26. [2020-10-13 05:01:48,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-13 05:01:48,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-10-13 05:01:48,518 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2020-10-13 05:01:48,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:48,518 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-10-13 05:01:48,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-13 05:01:48,518 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-10-13 05:01:48,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-13 05:01:48,519 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:48,519 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:48,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-13 05:01:48,520 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:48,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:48,520 INFO L82 PathProgramCache]: Analyzing trace with hash 130000393, now seen corresponding path program 5 times [2020-10-13 05:01:48,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:48,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896810213] [2020-10-13 05:01:48,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:48,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:48,538 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:48,563 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:48,818 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:49,527 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:49,528 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 30 [2020-10-13 05:01:49,528 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:01:49,528 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 995 [2020-10-13 05:01:49,529 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:49,529 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-13 05:01:49,529 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 17 [2020-10-13 05:01:49,530 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-13 05:01:49,530 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:01:49,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:49,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:49,603 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:49,605 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:49,605 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:49,606 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:49,606 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:01:49,606 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:49,607 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:49,607 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:49,607 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:49,608 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:01:49,611 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-10-13 05:01:49,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896810213] [2020-10-13 05:01:49,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:01:49,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-13 05:01:49,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650122878] [2020-10-13 05:01:49,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-13 05:01:49,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:49,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-13 05:01:49,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-13 05:01:49,615 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 7 states. [2020-10-13 05:01:49,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:49,783 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-10-13 05:01:49,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-13 05:01:49,784 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-10-13 05:01:49,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:49,785 INFO L225 Difference]: With dead ends: 49 [2020-10-13 05:01:49,786 INFO L226 Difference]: Without dead ends: 39 [2020-10-13 05:01:49,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-13 05:01:49,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-10-13 05:01:49,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 27. [2020-10-13 05:01:49,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-10-13 05:01:49,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-10-13 05:01:49,800 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 22 [2020-10-13 05:01:49,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:49,801 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-10-13 05:01:49,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-13 05:01:49,801 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-10-13 05:01:49,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-13 05:01:49,805 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:49,805 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:49,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-13 05:01:49,805 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:49,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:49,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1912151398, now seen corresponding path program 6 times [2020-10-13 05:01:49,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:49,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019672395] [2020-10-13 05:01:49,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:49,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:49,837 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:49,870 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:50,368 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:51,150 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:51,150 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 31 [2020-10-13 05:01:51,151 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:01:51,151 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1322 [2020-10-13 05:01:51,151 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:51,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 05:01:51,152 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:01:51,152 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-13 05:01:51,152 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:51,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:51,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:51,218 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:51,220 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:51,220 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:51,220 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:51,220 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:01:51,221 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:51,221 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:51,221 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:51,221 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:51,221 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:51,225 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-10-13 05:01:51,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019672395] [2020-10-13 05:01:51,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:01:51,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-13 05:01:51,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892385072] [2020-10-13 05:01:51,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-13 05:01:51,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:51,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-13 05:01:51,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 05:01:51,230 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 8 states. [2020-10-13 05:01:51,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:51,347 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2020-10-13 05:01:51,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-13 05:01:51,348 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-10-13 05:01:51,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:51,349 INFO L225 Difference]: With dead ends: 50 [2020-10-13 05:01:51,349 INFO L226 Difference]: Without dead ends: 34 [2020-10-13 05:01:51,350 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 05:01:51,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-13 05:01:51,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 28. [2020-10-13 05:01:51,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-10-13 05:01:51,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-10-13 05:01:51,360 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2020-10-13 05:01:51,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:51,363 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-10-13 05:01:51,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-13 05:01:51,363 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-10-13 05:01:51,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-13 05:01:51,364 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:51,364 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:51,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-13 05:01:51,364 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:51,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:51,365 INFO L82 PathProgramCache]: Analyzing trace with hash 911814026, now seen corresponding path program 7 times [2020-10-13 05:01:51,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:51,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146497808] [2020-10-13 05:01:51,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:51,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:51,383 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:51,404 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:51,801 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:52,640 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:52,640 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 32 [2020-10-13 05:01:52,641 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:01:52,641 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1263 [2020-10-13 05:01:52,641 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:52,641 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 05:01:52,641 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 18 [2020-10-13 05:01:52,642 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-13 05:01:52,642 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:52,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:52,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:52,707 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:52,708 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:52,708 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:52,709 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:52,709 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:01:52,709 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:52,710 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:52,710 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:52,710 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:52,710 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:01:52,713 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-13 05:01:52,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146497808] [2020-10-13 05:01:52,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:01:52,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-13 05:01:52,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001779729] [2020-10-13 05:01:52,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-13 05:01:52,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:52,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-13 05:01:52,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 05:01:52,716 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2020-10-13 05:01:52,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:52,863 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-10-13 05:01:52,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-13 05:01:52,864 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-10-13 05:01:52,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:52,865 INFO L225 Difference]: With dead ends: 54 [2020-10-13 05:01:52,865 INFO L226 Difference]: Without dead ends: 44 [2020-10-13 05:01:52,866 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-13 05:01:52,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-10-13 05:01:52,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 29. [2020-10-13 05:01:52,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-10-13 05:01:52,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-10-13 05:01:52,874 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 24 [2020-10-13 05:01:52,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:52,875 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-10-13 05:01:52,875 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-13 05:01:52,875 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-10-13 05:01:52,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-13 05:01:52,878 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:52,878 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:52,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-13 05:01:52,878 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:52,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:52,879 INFO L82 PathProgramCache]: Analyzing trace with hash 378570245, now seen corresponding path program 8 times [2020-10-13 05:01:52,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:52,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [753097890] [2020-10-13 05:01:52,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:52,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:52,900 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:52,925 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:53,404 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:54,087 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:54,087 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 33 [2020-10-13 05:01:54,087 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:01:54,088 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1194 [2020-10-13 05:01:54,088 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:54,088 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-10-13 05:01:54,088 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 18 [2020-10-13 05:01:54,088 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-13 05:01:54,089 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:54,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:54,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:54,160 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:54,162 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:54,163 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:54,164 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:54,165 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:01:54,165 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:54,165 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:54,165 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:54,165 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:54,166 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:54,169 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-13 05:01:54,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [753097890] [2020-10-13 05:01:54,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:01:54,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-10-13 05:01:54,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093900693] [2020-10-13 05:01:54,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-13 05:01:54,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:54,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-13 05:01:54,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-10-13 05:01:54,173 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 9 states. [2020-10-13 05:01:54,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:54,328 INFO L93 Difference]: Finished difference Result 66 states and 77 transitions. [2020-10-13 05:01:54,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-13 05:01:54,329 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-10-13 05:01:54,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:54,330 INFO L225 Difference]: With dead ends: 66 [2020-10-13 05:01:54,330 INFO L226 Difference]: Without dead ends: 49 [2020-10-13 05:01:54,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-10-13 05:01:54,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-10-13 05:01:54,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 31. [2020-10-13 05:01:54,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-13 05:01:54,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2020-10-13 05:01:54,336 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 25 [2020-10-13 05:01:54,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:54,336 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2020-10-13 05:01:54,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-13 05:01:54,337 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2020-10-13 05:01:54,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-13 05:01:54,337 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:54,337 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:54,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-13 05:01:54,338 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:54,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:54,338 INFO L82 PathProgramCache]: Analyzing trace with hash -1539667386, now seen corresponding path program 9 times [2020-10-13 05:01:54,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:54,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [141102379] [2020-10-13 05:01:54,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:54,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:54,358 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:54,386 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:55,030 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:56,277 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:56,278 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 35 [2020-10-13 05:01:56,278 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:01:56,278 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1926 [2020-10-13 05:01:56,279 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:56,279 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-13 05:01:56,279 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 19 [2020-10-13 05:01:56,279 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-13 05:01:56,279 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:56,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:56,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:56,364 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:56,365 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:56,365 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:56,365 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:56,365 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:01:56,366 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:56,366 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:56,366 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:56,367 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:56,367 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:01:56,369 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-10-13 05:01:56,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [141102379] [2020-10-13 05:01:56,370 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:01:56,370 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-13 05:01:56,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421929205] [2020-10-13 05:01:56,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-13 05:01:56,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:56,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-13 05:01:56,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-10-13 05:01:56,372 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 10 states. [2020-10-13 05:01:56,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:56,540 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2020-10-13 05:01:56,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-13 05:01:56,541 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-10-13 05:01:56,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:56,542 INFO L225 Difference]: With dead ends: 72 [2020-10-13 05:01:56,542 INFO L226 Difference]: Without dead ends: 54 [2020-10-13 05:01:56,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-10-13 05:01:56,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-10-13 05:01:56,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 33. [2020-10-13 05:01:56,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-10-13 05:01:56,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-10-13 05:01:56,552 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 27 [2020-10-13 05:01:56,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:56,553 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-10-13 05:01:56,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-13 05:01:56,553 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-10-13 05:01:56,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-13 05:01:56,553 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:56,554 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:56,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-10-13 05:01:56,557 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:56,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:56,558 INFO L82 PathProgramCache]: Analyzing trace with hash -411883739, now seen corresponding path program 10 times [2020-10-13 05:01:56,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:56,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [188883194] [2020-10-13 05:01:56,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:56,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:56,583 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:56,616 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:57,491 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:59,259 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:59,259 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 37 [2020-10-13 05:01:59,259 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:01:59,260 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2683 [2020-10-13 05:01:59,260 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:59,260 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-13 05:01:59,260 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:01:59,260 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-10-13 05:01:59,261 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:59,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:01:59,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:59,351 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:59,352 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:01:59,352 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:01:59,352 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:01:59,352 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:01:59,353 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:01:59,353 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:01:59,353 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:01:59,353 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:01:59,353 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:01:59,356 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-10-13 05:01:59,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [188883194] [2020-10-13 05:01:59,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:01:59,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-13 05:01:59,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43576270] [2020-10-13 05:01:59,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-13 05:01:59,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:01:59,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-13 05:01:59,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-10-13 05:01:59,360 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 11 states. [2020-10-13 05:01:59,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:01:59,492 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2020-10-13 05:01:59,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-13 05:01:59,493 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-10-13 05:01:59,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:01:59,493 INFO L225 Difference]: With dead ends: 65 [2020-10-13 05:01:59,494 INFO L226 Difference]: Without dead ends: 46 [2020-10-13 05:01:59,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-10-13 05:01:59,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-10-13 05:01:59,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 34. [2020-10-13 05:01:59,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-13 05:01:59,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-10-13 05:01:59,506 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2020-10-13 05:01:59,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:01:59,507 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-10-13 05:01:59,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-13 05:01:59,507 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-10-13 05:01:59,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-13 05:01:59,508 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:01:59,508 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:01:59,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-10-13 05:01:59,508 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:01:59,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:01:59,509 INFO L82 PathProgramCache]: Analyzing trace with hash -1209562039, now seen corresponding path program 11 times [2020-10-13 05:01:59,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:01:59,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [710782829] [2020-10-13 05:01:59,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:01:59,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:01:59,530 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:01:59,563 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:00,653 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:01,799 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:01,799 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 38 [2020-10-13 05:02:01,799 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:01,800 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2275 [2020-10-13 05:02:01,800 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:01,800 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-13 05:02:01,800 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 21 [2020-10-13 05:02:01,800 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-10-13 05:02:01,800 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:01,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:01,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:01,896 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:01,898 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:01,898 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:01,898 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:01,898 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:01,898 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:01,899 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:01,899 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:01,899 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:01,899 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:01,902 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-10-13 05:02:01,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [710782829] [2020-10-13 05:02:01,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:01,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-13 05:02:01,903 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110816944] [2020-10-13 05:02:01,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-13 05:02:01,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:01,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-13 05:02:01,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-10-13 05:02:01,905 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 11 states. [2020-10-13 05:02:02,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:02,094 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2020-10-13 05:02:02,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-13 05:02:02,094 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-10-13 05:02:02,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:02,095 INFO L225 Difference]: With dead ends: 69 [2020-10-13 05:02:02,095 INFO L226 Difference]: Without dead ends: 59 [2020-10-13 05:02:02,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-10-13 05:02:02,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-10-13 05:02:02,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 35. [2020-10-13 05:02:02,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-13 05:02:02,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-10-13 05:02:02,104 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 30 [2020-10-13 05:02:02,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:02,106 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-10-13 05:02:02,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-13 05:02:02,106 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-10-13 05:02:02,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-10-13 05:02:02,106 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:02,107 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:02,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-10-13 05:02:02,107 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:02,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:02,107 INFO L82 PathProgramCache]: Analyzing trace with hash -959578330, now seen corresponding path program 12 times [2020-10-13 05:02:02,108 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:02,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016555631] [2020-10-13 05:02:02,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:02,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:02,127 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:02,153 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:03,017 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:04,709 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:04,709 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 39 [2020-10-13 05:02:04,709 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:04,710 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2589 [2020-10-13 05:02:04,710 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:04,710 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-13 05:02:04,710 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:02:04,710 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-13 05:02:04,711 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:04,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:04,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:04,794 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:04,795 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:04,795 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:04,796 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:04,796 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:04,796 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:04,796 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:04,796 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:04,797 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:04,797 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:04,799 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-10-13 05:02:04,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016555631] [2020-10-13 05:02:04,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:04,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-13 05:02:04,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638192700] [2020-10-13 05:02:04,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-13 05:02:04,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:04,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-13 05:02:04,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-10-13 05:02:04,801 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 12 states. [2020-10-13 05:02:04,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:04,905 INFO L93 Difference]: Finished difference Result 68 states and 76 transitions. [2020-10-13 05:02:04,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-13 05:02:04,905 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-10-13 05:02:04,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:04,906 INFO L225 Difference]: With dead ends: 68 [2020-10-13 05:02:04,906 INFO L226 Difference]: Without dead ends: 48 [2020-10-13 05:02:04,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-10-13 05:02:04,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-13 05:02:04,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-10-13 05:02:04,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-10-13 05:02:04,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-10-13 05:02:04,911 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2020-10-13 05:02:04,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:04,912 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-10-13 05:02:04,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-13 05:02:04,912 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-10-13 05:02:04,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-13 05:02:04,913 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:04,913 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:04,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-10-13 05:02:04,913 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:04,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:04,914 INFO L82 PathProgramCache]: Analyzing trace with hash 1270721354, now seen corresponding path program 13 times [2020-10-13 05:02:04,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:04,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352198266] [2020-10-13 05:02:04,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:04,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:04,931 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:04,968 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:05,843 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:06,911 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:06,911 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-13 05:02:06,911 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:06,911 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1986 [2020-10-13 05:02:06,911 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:06,911 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-13 05:02:06,912 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 22 [2020-10-13 05:02:06,912 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-13 05:02:06,912 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:07,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:07,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:07,016 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:07,018 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:07,018 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:07,018 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:07,019 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:07,019 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:07,019 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:07,019 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:07,020 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:07,020 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:07,023 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-10-13 05:02:07,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352198266] [2020-10-13 05:02:07,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:07,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-13 05:02:07,027 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327314980] [2020-10-13 05:02:07,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-13 05:02:07,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:07,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-13 05:02:07,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-10-13 05:02:07,029 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 12 states. [2020-10-13 05:02:07,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:07,217 INFO L93 Difference]: Finished difference Result 74 states and 86 transitions. [2020-10-13 05:02:07,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-13 05:02:07,217 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-10-13 05:02:07,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:07,218 INFO L225 Difference]: With dead ends: 74 [2020-10-13 05:02:07,218 INFO L226 Difference]: Without dead ends: 64 [2020-10-13 05:02:07,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-10-13 05:02:07,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-10-13 05:02:07,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 37. [2020-10-13 05:02:07,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-10-13 05:02:07,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-10-13 05:02:07,227 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 32 [2020-10-13 05:02:07,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:07,228 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-10-13 05:02:07,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-13 05:02:07,228 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-10-13 05:02:07,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-13 05:02:07,231 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:07,231 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:07,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-10-13 05:02:07,231 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:07,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:07,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1380204475, now seen corresponding path program 14 times [2020-10-13 05:02:07,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:07,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280801628] [2020-10-13 05:02:07,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:07,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:07,255 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:07,292 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:08,133 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:09,413 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:09,413 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 41 [2020-10-13 05:02:09,413 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:09,413 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2164 [2020-10-13 05:02:09,414 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:09,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 11 [2020-10-13 05:02:09,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:02:09,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-10-13 05:02:09,414 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:09,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:09,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:09,513 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:09,514 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:09,514 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:09,514 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:09,514 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:09,514 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:09,514 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:09,515 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:09,515 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:09,515 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:09,517 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-10-13 05:02:09,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280801628] [2020-10-13 05:02:09,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:09,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-10-13 05:02:09,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857912322] [2020-10-13 05:02:09,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-13 05:02:09,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:09,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-13 05:02:09,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-10-13 05:02:09,519 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 13 states. [2020-10-13 05:02:09,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:09,653 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-10-13 05:02:09,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-13 05:02:09,653 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-10-13 05:02:09,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:09,654 INFO L225 Difference]: With dead ends: 74 [2020-10-13 05:02:09,654 INFO L226 Difference]: Without dead ends: 53 [2020-10-13 05:02:09,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-10-13 05:02:09,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-10-13 05:02:09,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 38. [2020-10-13 05:02:09,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-10-13 05:02:09,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-10-13 05:02:09,660 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 33 [2020-10-13 05:02:09,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:09,660 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-10-13 05:02:09,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-13 05:02:09,660 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-10-13 05:02:09,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-10-13 05:02:09,661 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:09,661 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:09,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-10-13 05:02:09,661 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:09,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:09,662 INFO L82 PathProgramCache]: Analyzing trace with hash -1250888855, now seen corresponding path program 15 times [2020-10-13 05:02:09,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:09,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071959970] [2020-10-13 05:02:09,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:09,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:09,679 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:09,722 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:10,942 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:12,827 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:12,828 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 42 [2020-10-13 05:02:12,828 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:12,828 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3154 [2020-10-13 05:02:12,828 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:12,829 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 11 [2020-10-13 05:02:12,829 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-10-13 05:02:12,829 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-10-13 05:02:12,829 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:12,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:12,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:12,930 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:12,931 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:12,931 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:12,932 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:12,932 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:12,932 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:12,932 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:12,932 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:12,932 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:12,933 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:12,935 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-10-13 05:02:12,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071959970] [2020-10-13 05:02:12,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:12,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-10-13 05:02:12,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488595047] [2020-10-13 05:02:12,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-13 05:02:12,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:12,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-13 05:02:12,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-10-13 05:02:12,937 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 13 states. [2020-10-13 05:02:13,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:13,132 INFO L93 Difference]: Finished difference Result 79 states and 92 transitions. [2020-10-13 05:02:13,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-13 05:02:13,133 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-10-13 05:02:13,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:13,133 INFO L225 Difference]: With dead ends: 79 [2020-10-13 05:02:13,134 INFO L226 Difference]: Without dead ends: 69 [2020-10-13 05:02:13,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-10-13 05:02:13,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-10-13 05:02:13,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 39. [2020-10-13 05:02:13,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-10-13 05:02:13,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-10-13 05:02:13,140 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 34 [2020-10-13 05:02:13,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:13,140 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-10-13 05:02:13,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-13 05:02:13,141 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-10-13 05:02:13,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-10-13 05:02:13,141 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:13,141 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:13,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-10-13 05:02:13,142 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:13,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:13,142 INFO L82 PathProgramCache]: Analyzing trace with hash 2054257670, now seen corresponding path program 16 times [2020-10-13 05:02:13,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:13,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1720851495] [2020-10-13 05:02:13,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:13,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:13,160 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:13,192 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:14,169 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:15,806 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:15,806 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 43 [2020-10-13 05:02:15,807 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:15,807 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2652 [2020-10-13 05:02:15,807 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:15,807 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-10-13 05:02:15,807 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-10-13 05:02:15,807 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-10-13 05:02:15,807 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:15,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:15,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:15,930 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:15,931 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:15,931 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:15,931 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:15,931 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 05:02:15,931 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:15,931 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:15,932 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:15,932 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:15,932 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:15,934 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-10-13 05:02:15,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1720851495] [2020-10-13 05:02:15,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:15,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-10-13 05:02:15,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598440084] [2020-10-13 05:02:15,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-13 05:02:15,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:15,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-13 05:02:15,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-10-13 05:02:15,936 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 14 states. [2020-10-13 05:02:16,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:16,134 INFO L93 Difference]: Finished difference Result 96 states and 112 transitions. [2020-10-13 05:02:16,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-13 05:02:16,134 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-10-13 05:02:16,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:16,135 INFO L225 Difference]: With dead ends: 96 [2020-10-13 05:02:16,135 INFO L226 Difference]: Without dead ends: 74 [2020-10-13 05:02:16,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-10-13 05:02:16,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-10-13 05:02:16,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 41. [2020-10-13 05:02:16,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-13 05:02:16,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2020-10-13 05:02:16,140 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 35 [2020-10-13 05:02:16,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:16,140 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2020-10-13 05:02:16,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-13 05:02:16,141 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2020-10-13 05:02:16,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-10-13 05:02:16,141 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:16,141 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:16,141 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-10-13 05:02:16,141 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:16,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:16,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1290555749, now seen corresponding path program 17 times [2020-10-13 05:02:16,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:16,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729329687] [2020-10-13 05:02:16,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:16,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:16,162 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:16,210 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:17,470 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:19,404 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:19,404 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 45 [2020-10-13 05:02:19,404 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:19,404 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3248 [2020-10-13 05:02:19,405 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:19,405 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 13 [2020-10-13 05:02:19,405 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 24 [2020-10-13 05:02:19,405 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 13 [2020-10-13 05:02:19,405 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:19,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:19,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:19,540 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:19,541 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:19,541 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:19,541 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:19,541 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:19,542 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:19,542 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:19,542 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:19,542 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:19,542 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:19,545 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-10-13 05:02:19,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729329687] [2020-10-13 05:02:19,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:19,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-10-13 05:02:19,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892997087] [2020-10-13 05:02:19,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-13 05:02:19,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:19,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-13 05:02:19,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-10-13 05:02:19,547 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 15 states. [2020-10-13 05:02:19,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:19,822 INFO L93 Difference]: Finished difference Result 102 states and 119 transitions. [2020-10-13 05:02:19,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-10-13 05:02:19,823 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-10-13 05:02:19,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:19,824 INFO L225 Difference]: With dead ends: 102 [2020-10-13 05:02:19,824 INFO L226 Difference]: Without dead ends: 79 [2020-10-13 05:02:19,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-10-13 05:02:19,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-10-13 05:02:19,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 43. [2020-10-13 05:02:19,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-10-13 05:02:19,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2020-10-13 05:02:19,838 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 37 [2020-10-13 05:02:19,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:19,839 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2020-10-13 05:02:19,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-13 05:02:19,839 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2020-10-13 05:02:19,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-10-13 05:02:19,839 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:19,839 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:19,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-10-13 05:02:19,840 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:19,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:19,840 INFO L82 PathProgramCache]: Analyzing trace with hash -1738342170, now seen corresponding path program 18 times [2020-10-13 05:02:19,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:19,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066314134] [2020-10-13 05:02:19,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:19,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:19,861 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:19,915 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:21,993 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:24,774 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:24,774 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 47 [2020-10-13 05:02:24,774 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:24,775 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4920 [2020-10-13 05:02:24,775 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:24,775 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 14 [2020-10-13 05:02:24,775 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 25 [2020-10-13 05:02:24,775 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 14 [2020-10-13 05:02:24,775 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:24,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:24,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:24,905 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:24,906 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:24,907 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:24,907 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:24,907 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:24,907 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:24,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:24,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:24,908 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:24,908 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:24,911 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-10-13 05:02:24,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066314134] [2020-10-13 05:02:24,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:24,912 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-10-13 05:02:24,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312202517] [2020-10-13 05:02:24,913 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-10-13 05:02:24,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:24,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-10-13 05:02:24,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-10-13 05:02:24,914 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 16 states. [2020-10-13 05:02:25,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:25,185 INFO L93 Difference]: Finished difference Result 108 states and 126 transitions. [2020-10-13 05:02:25,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-13 05:02:25,185 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-10-13 05:02:25,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:25,186 INFO L225 Difference]: With dead ends: 108 [2020-10-13 05:02:25,186 INFO L226 Difference]: Without dead ends: 84 [2020-10-13 05:02:25,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-10-13 05:02:25,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-10-13 05:02:25,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 45. [2020-10-13 05:02:25,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-10-13 05:02:25,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2020-10-13 05:02:25,192 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 39 [2020-10-13 05:02:25,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:25,192 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2020-10-13 05:02:25,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-10-13 05:02:25,192 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2020-10-13 05:02:25,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-10-13 05:02:25,193 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:25,193 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:25,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-10-13 05:02:25,193 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:25,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:25,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1074190981, now seen corresponding path program 19 times [2020-10-13 05:02:25,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:25,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [966704095] [2020-10-13 05:02:25,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:25,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:25,211 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:25,254 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:27,601 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:30,090 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:30,090 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 49 [2020-10-13 05:02:30,090 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:30,090 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4885 [2020-10-13 05:02:30,090 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:30,090 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 15 [2020-10-13 05:02:30,090 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:02:30,091 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-10-13 05:02:30,091 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:30,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:30,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:30,248 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:30,249 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:30,249 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:30,249 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:30,249 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:30,249 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:30,250 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:30,250 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:30,250 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:30,250 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:30,252 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-10-13 05:02:30,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [966704095] [2020-10-13 05:02:30,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:30,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-10-13 05:02:30,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120414638] [2020-10-13 05:02:30,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-13 05:02:30,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:30,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-13 05:02:30,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-10-13 05:02:30,254 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 17 states. [2020-10-13 05:02:30,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:30,492 INFO L93 Difference]: Finished difference Result 92 states and 103 transitions. [2020-10-13 05:02:30,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-10-13 05:02:30,495 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-10-13 05:02:30,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:30,496 INFO L225 Difference]: With dead ends: 92 [2020-10-13 05:02:30,496 INFO L226 Difference]: Without dead ends: 67 [2020-10-13 05:02:30,497 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-10-13 05:02:30,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-10-13 05:02:30,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 46. [2020-10-13 05:02:30,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-13 05:02:30,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-10-13 05:02:30,513 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 41 [2020-10-13 05:02:30,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:30,513 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-10-13 05:02:30,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-13 05:02:30,513 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-10-13 05:02:30,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-13 05:02:30,514 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:30,514 INFO L422 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:30,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-10-13 05:02:30,514 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:30,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:30,515 INFO L82 PathProgramCache]: Analyzing trace with hash 1048095145, now seen corresponding path program 20 times [2020-10-13 05:02:30,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:30,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [938485362] [2020-10-13 05:02:30,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:30,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:30,542 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:30,587 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:32,880 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:35,538 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:35,538 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50 [2020-10-13 05:02:35,538 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:35,538 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5003 [2020-10-13 05:02:35,538 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:35,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 15 [2020-10-13 05:02:35,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 27 [2020-10-13 05:02:35,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-10-13 05:02:35,539 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:35,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:35,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:35,690 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:35,691 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:35,692 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:35,692 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:35,692 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:35,692 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:35,692 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:35,692 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:35,692 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:35,692 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:35,695 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-10-13 05:02:35,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [938485362] [2020-10-13 05:02:35,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:35,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-10-13 05:02:35,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090055564] [2020-10-13 05:02:35,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-13 05:02:35,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:35,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-13 05:02:35,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-10-13 05:02:35,697 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 17 states. [2020-10-13 05:02:35,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:35,965 INFO L93 Difference]: Finished difference Result 99 states and 116 transitions. [2020-10-13 05:02:35,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-10-13 05:02:35,966 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 42 [2020-10-13 05:02:35,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:35,967 INFO L225 Difference]: With dead ends: 99 [2020-10-13 05:02:35,968 INFO L226 Difference]: Without dead ends: 89 [2020-10-13 05:02:35,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-10-13 05:02:35,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-10-13 05:02:35,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 47. [2020-10-13 05:02:35,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-10-13 05:02:35,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2020-10-13 05:02:35,982 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 42 [2020-10-13 05:02:35,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:35,982 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2020-10-13 05:02:35,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-13 05:02:35,983 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2020-10-13 05:02:35,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-10-13 05:02:35,983 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:35,983 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:35,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-10-13 05:02:35,984 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:35,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:35,984 INFO L82 PathProgramCache]: Analyzing trace with hash 308317638, now seen corresponding path program 21 times [2020-10-13 05:02:35,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:35,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1258166854] [2020-10-13 05:02:35,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:35,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:36,003 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:36,051 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:38,586 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:40,999 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:40,999 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 51 [2020-10-13 05:02:41,000 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:41,000 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5002 [2020-10-13 05:02:41,000 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:41,000 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 16 [2020-10-13 05:02:41,000 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 27 [2020-10-13 05:02:41,000 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-13 05:02:41,001 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:41,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:41,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:41,172 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:41,173 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:41,173 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:41,173 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:41,173 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:41,173 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:41,173 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:41,173 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:41,174 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:41,174 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:41,176 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-10-13 05:02:41,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1258166854] [2020-10-13 05:02:41,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:41,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-10-13 05:02:41,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103003280] [2020-10-13 05:02:41,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-10-13 05:02:41,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:41,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-10-13 05:02:41,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-10-13 05:02:41,178 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 18 states. [2020-10-13 05:02:41,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:41,525 INFO L93 Difference]: Finished difference Result 120 states and 140 transitions. [2020-10-13 05:02:41,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-10-13 05:02:41,526 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-10-13 05:02:41,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:41,528 INFO L225 Difference]: With dead ends: 120 [2020-10-13 05:02:41,528 INFO L226 Difference]: Without dead ends: 94 [2020-10-13 05:02:41,529 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-10-13 05:02:41,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-10-13 05:02:41,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 49. [2020-10-13 05:02:41,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-10-13 05:02:41,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2020-10-13 05:02:41,535 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 43 [2020-10-13 05:02:41,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:41,535 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2020-10-13 05:02:41,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-10-13 05:02:41,535 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2020-10-13 05:02:41,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-13 05:02:41,536 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:41,536 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:41,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-10-13 05:02:41,536 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:41,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:41,537 INFO L82 PathProgramCache]: Analyzing trace with hash -1181918299, now seen corresponding path program 22 times [2020-10-13 05:02:41,537 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:41,537 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1604834690] [2020-10-13 05:02:41,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:41,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:41,555 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:41,613 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:44,698 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:46,548 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:46,549 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 53 [2020-10-13 05:02:46,549 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:46,549 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5000 [2020-10-13 05:02:46,549 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:46,549 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 17 [2020-10-13 05:02:46,549 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 28 [2020-10-13 05:02:46,549 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 17 [2020-10-13 05:02:46,549 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:46,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:46,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:46,756 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:46,758 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:46,758 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:46,758 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:46,759 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:02:46,759 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:46,759 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:46,759 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:46,760 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:46,760 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:46,764 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-10-13 05:02:46,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1604834690] [2020-10-13 05:02:46,765 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:46,765 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-10-13 05:02:46,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331334975] [2020-10-13 05:02:46,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-10-13 05:02:46,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:46,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-10-13 05:02:46,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-10-13 05:02:46,769 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 19 states. [2020-10-13 05:02:47,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:47,146 INFO L93 Difference]: Finished difference Result 126 states and 147 transitions. [2020-10-13 05:02:47,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-10-13 05:02:47,147 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-10-13 05:02:47,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:47,148 INFO L225 Difference]: With dead ends: 126 [2020-10-13 05:02:47,149 INFO L226 Difference]: Without dead ends: 99 [2020-10-13 05:02:47,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-10-13 05:02:47,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-10-13 05:02:47,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 51. [2020-10-13 05:02:47,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-10-13 05:02:47,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2020-10-13 05:02:47,160 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 45 [2020-10-13 05:02:47,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:47,161 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2020-10-13 05:02:47,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-10-13 05:02:47,161 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2020-10-13 05:02:47,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-10-13 05:02:47,162 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:47,162 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:47,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-10-13 05:02:47,163 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:47,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:47,163 INFO L82 PathProgramCache]: Analyzing trace with hash -760733018, now seen corresponding path program 23 times [2020-10-13 05:02:47,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:47,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1374878072] [2020-10-13 05:02:47,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:47,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:47,182 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:47,257 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:50,835 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:52,177 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:52,177 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 55 [2020-10-13 05:02:52,177 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:52,178 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5002 [2020-10-13 05:02:52,178 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:52,178 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 18 [2020-10-13 05:02:52,178 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 29 [2020-10-13 05:02:52,178 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-10-13 05:02:52,178 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:52,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:52,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:52,432 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:52,433 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:52,434 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:52,434 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:52,437 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:52,437 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:52,437 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:52,437 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:52,437 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:52,438 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:52,441 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-10-13 05:02:52,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1374878072] [2020-10-13 05:02:52,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:52,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-10-13 05:02:52,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678847484] [2020-10-13 05:02:52,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-10-13 05:02:52,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:52,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-10-13 05:02:52,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-10-13 05:02:52,447 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 20 states. [2020-10-13 05:02:52,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:52,836 INFO L93 Difference]: Finished difference Result 132 states and 154 transitions. [2020-10-13 05:02:52,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-10-13 05:02:52,837 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-10-13 05:02:52,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:52,838 INFO L225 Difference]: With dead ends: 132 [2020-10-13 05:02:52,838 INFO L226 Difference]: Without dead ends: 104 [2020-10-13 05:02:52,839 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-10-13 05:02:52,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-10-13 05:02:52,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 53. [2020-10-13 05:02:52,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-10-13 05:02:52,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2020-10-13 05:02:52,848 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 47 [2020-10-13 05:02:52,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:52,849 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2020-10-13 05:02:52,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-10-13 05:02:52,849 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2020-10-13 05:02:52,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-10-13 05:02:52,852 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:52,852 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:52,852 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-10-13 05:02:52,852 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:52,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:52,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1014901563, now seen corresponding path program 24 times [2020-10-13 05:02:52,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:52,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856058200] [2020-10-13 05:02:52,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:52,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:52,868 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:52,933 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:57,518 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:57,867 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:57,867 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 57 [2020-10-13 05:02:57,868 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 05:02:57,868 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5004 [2020-10-13 05:02:57,868 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:57,868 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 19 [2020-10-13 05:02:57,868 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 30 [2020-10-13 05:02:57,868 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 19 [2020-10-13 05:02:57,868 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:02:58,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:02:58,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:58,145 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:58,147 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:02:58,147 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:02:58,147 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:02:58,148 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:02:58,148 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:02:58,148 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:02:58,149 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:02:58,149 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:02:58,149 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 05:02:58,154 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-10-13 05:02:58,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856058200] [2020-10-13 05:02:58,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:02:58,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-10-13 05:02:58,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693353165] [2020-10-13 05:02:58,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-10-13 05:02:58,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:02:58,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-10-13 05:02:58,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-10-13 05:02:58,168 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand 21 states. [2020-10-13 05:02:58,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:02:58,667 INFO L93 Difference]: Finished difference Result 138 states and 161 transitions. [2020-10-13 05:02:58,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-10-13 05:02:58,668 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-10-13 05:02:58,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:02:58,669 INFO L225 Difference]: With dead ends: 138 [2020-10-13 05:02:58,669 INFO L226 Difference]: Without dead ends: 109 [2020-10-13 05:02:58,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-10-13 05:02:58,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-10-13 05:02:58,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 55. [2020-10-13 05:02:58,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-10-13 05:02:58,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2020-10-13 05:02:58,692 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 49 [2020-10-13 05:02:58,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:02:58,692 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2020-10-13 05:02:58,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-10-13 05:02:58,692 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2020-10-13 05:02:58,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-10-13 05:02:58,693 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:02:58,693 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:02:58,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-10-13 05:02:58,694 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:02:58,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:02:58,695 INFO L82 PathProgramCache]: Analyzing trace with hash -1678262394, now seen corresponding path program 25 times [2020-10-13 05:02:58,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:02:58,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1113119107] [2020-10-13 05:02:58,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:02:58,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:02:58,723 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:02:58,882 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:03,713 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:03,713 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 59 [2020-10-13 05:03:03,714 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:03,714 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4999 [2020-10-13 05:03:03,714 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:03,714 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 20 [2020-10-13 05:03:03,714 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:03:03,714 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 20 [2020-10-13 05:03:03,714 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:03,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:03,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:03,976 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:03,977 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:03,978 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:03,978 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:03,978 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:03:03,978 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:03,978 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:03,979 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:03,979 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:03,979 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:03,983 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-10-13 05:03:03,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1113119107] [2020-10-13 05:03:03,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:03,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-10-13 05:03:03,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200038625] [2020-10-13 05:03:03,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-10-13 05:03:03,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:03,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-10-13 05:03:03,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-10-13 05:03:03,985 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand 22 states. [2020-10-13 05:03:04,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:04,197 INFO L93 Difference]: Finished difference Result 113 states and 126 transitions. [2020-10-13 05:03:04,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-10-13 05:03:04,198 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-10-13 05:03:04,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:04,199 INFO L225 Difference]: With dead ends: 113 [2020-10-13 05:03:04,199 INFO L226 Difference]: Without dead ends: 83 [2020-10-13 05:03:04,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-10-13 05:03:04,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-10-13 05:03:04,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 56. [2020-10-13 05:03:04,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-10-13 05:03:04,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-10-13 05:03:04,207 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2020-10-13 05:03:04,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:04,207 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-10-13 05:03:04,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-10-13 05:03:04,208 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-10-13 05:03:04,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-10-13 05:03:04,212 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:04,212 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:04,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-10-13 05:03:04,213 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:04,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:04,213 INFO L82 PathProgramCache]: Analyzing trace with hash -572788310, now seen corresponding path program 26 times [2020-10-13 05:03:04,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:04,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1384822048] [2020-10-13 05:03:04,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:04,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:04,236 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:04,331 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:09,238 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:09,238 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 60 [2020-10-13 05:03:09,238 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:09,238 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5009 [2020-10-13 05:03:09,238 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:09,238 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 20 [2020-10-13 05:03:09,238 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 32 [2020-10-13 05:03:09,239 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 20 [2020-10-13 05:03:09,239 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:09,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:09,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:09,496 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:09,497 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:09,497 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:09,497 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:09,497 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:09,498 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:09,498 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:09,498 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:09,498 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:09,498 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:09,501 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-10-13 05:03:09,501 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1384822048] [2020-10-13 05:03:09,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:09,502 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-10-13 05:03:09,502 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643665203] [2020-10-13 05:03:09,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-10-13 05:03:09,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:09,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-10-13 05:03:09,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-10-13 05:03:09,503 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 22 states. [2020-10-13 05:03:09,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:09,813 INFO L93 Difference]: Finished difference Result 124 states and 146 transitions. [2020-10-13 05:03:09,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-10-13 05:03:09,814 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 52 [2020-10-13 05:03:09,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:09,815 INFO L225 Difference]: With dead ends: 124 [2020-10-13 05:03:09,815 INFO L226 Difference]: Without dead ends: 114 [2020-10-13 05:03:09,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-10-13 05:03:09,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-10-13 05:03:09,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 57. [2020-10-13 05:03:09,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-10-13 05:03:09,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-10-13 05:03:09,822 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 52 [2020-10-13 05:03:09,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:09,822 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-10-13 05:03:09,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-10-13 05:03:09,822 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-10-13 05:03:09,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-10-13 05:03:09,823 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:09,823 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:09,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-10-13 05:03:09,823 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:09,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:09,823 INFO L82 PathProgramCache]: Analyzing trace with hash 1600538085, now seen corresponding path program 27 times [2020-10-13 05:03:09,824 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:09,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1647514933] [2020-10-13 05:03:09,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:09,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:09,839 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:09,923 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:14,836 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:14,837 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 61 [2020-10-13 05:03:14,837 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:14,837 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5002 [2020-10-13 05:03:14,837 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:14,837 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 21 [2020-10-13 05:03:14,837 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:03:14,837 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-13 05:03:14,838 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:15,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:15,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:15,110 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:15,110 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:15,111 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:15,111 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:15,111 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:15,111 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:15,111 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:15,111 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:15,111 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:15,111 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:15,114 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-10-13 05:03:15,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1647514933] [2020-10-13 05:03:15,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:15,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-10-13 05:03:15,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373909792] [2020-10-13 05:03:15,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-10-13 05:03:15,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:15,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-10-13 05:03:15,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-10-13 05:03:15,116 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 23 states. [2020-10-13 05:03:15,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:15,358 INFO L93 Difference]: Finished difference Result 119 states and 133 transitions. [2020-10-13 05:03:15,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-10-13 05:03:15,360 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-10-13 05:03:15,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:15,361 INFO L225 Difference]: With dead ends: 119 [2020-10-13 05:03:15,361 INFO L226 Difference]: Without dead ends: 88 [2020-10-13 05:03:15,362 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-10-13 05:03:15,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-10-13 05:03:15,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 58. [2020-10-13 05:03:15,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-10-13 05:03:15,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-10-13 05:03:15,367 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2020-10-13 05:03:15,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:15,367 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-10-13 05:03:15,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-10-13 05:03:15,367 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-10-13 05:03:15,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-10-13 05:03:15,368 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:15,368 INFO L422 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:15,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-10-13 05:03:15,368 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:15,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:15,368 INFO L82 PathProgramCache]: Analyzing trace with hash -1190756599, now seen corresponding path program 28 times [2020-10-13 05:03:15,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:15,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1063272973] [2020-10-13 05:03:15,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:15,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:15,389 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:15,486 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:20,392 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:20,392 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 62 [2020-10-13 05:03:20,392 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:20,392 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5010 [2020-10-13 05:03:20,392 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:20,392 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 21 [2020-10-13 05:03:20,392 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 33 [2020-10-13 05:03:20,393 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-13 05:03:20,393 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:20,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:20,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:20,682 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:20,682 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:20,683 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:20,683 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:20,683 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:20,683 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:20,683 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:20,684 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:20,684 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:20,684 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:20,687 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-10-13 05:03:20,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1063272973] [2020-10-13 05:03:20,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:20,688 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-10-13 05:03:20,688 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432513537] [2020-10-13 05:03:20,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-10-13 05:03:20,689 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:20,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-10-13 05:03:20,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-10-13 05:03:20,690 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 23 states. [2020-10-13 05:03:21,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:21,125 INFO L93 Difference]: Finished difference Result 129 states and 152 transitions. [2020-10-13 05:03:21,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-10-13 05:03:21,126 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 54 [2020-10-13 05:03:21,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:21,127 INFO L225 Difference]: With dead ends: 129 [2020-10-13 05:03:21,127 INFO L226 Difference]: Without dead ends: 119 [2020-10-13 05:03:21,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-10-13 05:03:21,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2020-10-13 05:03:21,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 59. [2020-10-13 05:03:21,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-10-13 05:03:21,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2020-10-13 05:03:21,134 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 54 [2020-10-13 05:03:21,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:21,134 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2020-10-13 05:03:21,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-10-13 05:03:21,134 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2020-10-13 05:03:21,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-10-13 05:03:21,135 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:21,135 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:21,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-10-13 05:03:21,135 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:21,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:21,136 INFO L82 PathProgramCache]: Analyzing trace with hash -376609690, now seen corresponding path program 29 times [2020-10-13 05:03:21,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:21,136 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165717846] [2020-10-13 05:03:21,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:21,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:21,159 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:21,259 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:26,156 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:26,157 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 63 [2020-10-13 05:03:26,157 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:26,157 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5006 [2020-10-13 05:03:26,157 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:26,157 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 22 [2020-10-13 05:03:26,157 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 33 [2020-10-13 05:03:26,157 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 22 [2020-10-13 05:03:26,157 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:26,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:26,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:26,435 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:26,436 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:26,436 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:26,436 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:26,436 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:26,436 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:26,436 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:26,437 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:26,437 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:26,437 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:26,440 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-10-13 05:03:26,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165717846] [2020-10-13 05:03:26,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:26,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-10-13 05:03:26,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144904862] [2020-10-13 05:03:26,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-10-13 05:03:26,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:26,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-10-13 05:03:26,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-10-13 05:03:26,442 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 24 states. [2020-10-13 05:03:26,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:26,896 INFO L93 Difference]: Finished difference Result 156 states and 182 transitions. [2020-10-13 05:03:26,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-10-13 05:03:26,897 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-10-13 05:03:26,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:26,899 INFO L225 Difference]: With dead ends: 156 [2020-10-13 05:03:26,899 INFO L226 Difference]: Without dead ends: 124 [2020-10-13 05:03:26,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-10-13 05:03:26,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-10-13 05:03:26,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 61. [2020-10-13 05:03:26,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-10-13 05:03:26,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2020-10-13 05:03:26,905 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 55 [2020-10-13 05:03:26,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:26,905 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2020-10-13 05:03:26,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-10-13 05:03:26,906 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2020-10-13 05:03:26,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-10-13 05:03:26,906 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:26,906 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:26,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-10-13 05:03:26,907 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:26,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:26,907 INFO L82 PathProgramCache]: Analyzing trace with hash -1505972475, now seen corresponding path program 30 times [2020-10-13 05:03:26,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:26,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925788128] [2020-10-13 05:03:26,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:26,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:26,930 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:27,041 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:31,932 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:31,933 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 65 [2020-10-13 05:03:31,933 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:31,933 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5010 [2020-10-13 05:03:31,933 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:31,933 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 23 [2020-10-13 05:03:31,934 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 34 [2020-10-13 05:03:31,934 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-10-13 05:03:31,934 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:32,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:32,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:32,259 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:32,259 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:32,259 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:32,260 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:32,260 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:32,260 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:32,260 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:32,260 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:32,260 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:32,260 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:32,264 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-10-13 05:03:32,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1925788128] [2020-10-13 05:03:32,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:32,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-10-13 05:03:32,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083163119] [2020-10-13 05:03:32,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-10-13 05:03:32,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:32,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-10-13 05:03:32,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-10-13 05:03:32,269 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand 25 states. [2020-10-13 05:03:32,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:32,822 INFO L93 Difference]: Finished difference Result 162 states and 189 transitions. [2020-10-13 05:03:32,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-10-13 05:03:32,823 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-10-13 05:03:32,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:32,825 INFO L225 Difference]: With dead ends: 162 [2020-10-13 05:03:32,827 INFO L226 Difference]: Without dead ends: 129 [2020-10-13 05:03:32,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-10-13 05:03:32,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-10-13 05:03:32,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 63. [2020-10-13 05:03:32,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-10-13 05:03:32,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2020-10-13 05:03:32,839 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 57 [2020-10-13 05:03:32,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:32,839 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2020-10-13 05:03:32,839 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-10-13 05:03:32,839 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2020-10-13 05:03:32,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-10-13 05:03:32,840 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:32,840 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:32,840 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-10-13 05:03:32,841 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:32,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:32,841 INFO L82 PathProgramCache]: Analyzing trace with hash -819523258, now seen corresponding path program 31 times [2020-10-13 05:03:32,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:32,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028758196] [2020-10-13 05:03:32,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:32,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:32,885 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:33,022 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:37,879 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:37,879 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 67 [2020-10-13 05:03:37,879 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:37,879 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5012 [2020-10-13 05:03:37,879 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:37,879 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 24 [2020-10-13 05:03:37,880 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 35 [2020-10-13 05:03:37,880 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 24 [2020-10-13 05:03:37,880 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:38,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:38,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:38,223 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:38,224 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:38,224 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:38,225 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:38,225 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:38,225 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:38,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:38,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:38,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:38,225 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:38,228 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2020-10-13 05:03:38,228 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2028758196] [2020-10-13 05:03:38,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:38,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-10-13 05:03:38,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246388162] [2020-10-13 05:03:38,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-10-13 05:03:38,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:38,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-10-13 05:03:38,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-10-13 05:03:38,230 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 26 states. [2020-10-13 05:03:38,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:38,661 INFO L93 Difference]: Finished difference Result 168 states and 196 transitions. [2020-10-13 05:03:38,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-10-13 05:03:38,662 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-10-13 05:03:38,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:38,663 INFO L225 Difference]: With dead ends: 168 [2020-10-13 05:03:38,663 INFO L226 Difference]: Without dead ends: 134 [2020-10-13 05:03:38,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-10-13 05:03:38,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-10-13 05:03:38,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 65. [2020-10-13 05:03:38,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-10-13 05:03:38,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2020-10-13 05:03:38,669 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 59 [2020-10-13 05:03:38,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:38,670 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2020-10-13 05:03:38,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-10-13 05:03:38,670 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2020-10-13 05:03:38,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-10-13 05:03:38,670 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:38,671 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:38,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-10-13 05:03:38,671 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:38,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:38,671 INFO L82 PathProgramCache]: Analyzing trace with hash -393801691, now seen corresponding path program 32 times [2020-10-13 05:03:38,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:38,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1882129098] [2020-10-13 05:03:38,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:38,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:38,699 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:38,817 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:43,688 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:43,689 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 69 [2020-10-13 05:03:43,689 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:43,689 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5000 [2020-10-13 05:03:43,689 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:43,689 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 25 [2020-10-13 05:03:43,689 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 36 [2020-10-13 05:03:43,689 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 25 [2020-10-13 05:03:43,689 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:44,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:44,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:44,065 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:44,067 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:44,068 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:44,068 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:44,068 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:03:44,068 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:44,068 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:44,069 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:44,069 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:44,069 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:44,073 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2020-10-13 05:03:44,074 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1882129098] [2020-10-13 05:03:44,074 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:44,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-10-13 05:03:44,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189794769] [2020-10-13 05:03:44,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-10-13 05:03:44,076 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:44,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-10-13 05:03:44,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-10-13 05:03:44,077 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand 27 states. [2020-10-13 05:03:44,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:44,533 INFO L93 Difference]: Finished difference Result 174 states and 203 transitions. [2020-10-13 05:03:44,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-10-13 05:03:44,533 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-10-13 05:03:44,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:44,535 INFO L225 Difference]: With dead ends: 174 [2020-10-13 05:03:44,535 INFO L226 Difference]: Without dead ends: 139 [2020-10-13 05:03:44,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-10-13 05:03:44,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2020-10-13 05:03:44,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 67. [2020-10-13 05:03:44,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-10-13 05:03:44,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2020-10-13 05:03:44,543 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 61 [2020-10-13 05:03:44,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:44,543 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2020-10-13 05:03:44,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-10-13 05:03:44,544 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2020-10-13 05:03:44,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-10-13 05:03:44,544 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:44,544 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:44,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-10-13 05:03:44,544 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:44,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:44,545 INFO L82 PathProgramCache]: Analyzing trace with hash -654129626, now seen corresponding path program 33 times [2020-10-13 05:03:44,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:44,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [68866046] [2020-10-13 05:03:44,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:44,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:44,579 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:44,732 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:49,569 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:49,570 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 71 [2020-10-13 05:03:49,570 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:49,570 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5003 [2020-10-13 05:03:49,570 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:49,570 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 26 [2020-10-13 05:03:49,570 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:03:49,570 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 26 [2020-10-13 05:03:49,570 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:49,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:49,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:49,947 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:49,949 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:49,949 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:49,949 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:49,949 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:03:49,949 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:49,949 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:49,949 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:49,949 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:49,950 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:49,953 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-10-13 05:03:49,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [68866046] [2020-10-13 05:03:49,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:49,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-10-13 05:03:49,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525062221] [2020-10-13 05:03:49,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-10-13 05:03:49,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:49,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-10-13 05:03:49,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-10-13 05:03:49,954 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand 28 states. [2020-10-13 05:03:50,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:50,249 INFO L93 Difference]: Finished difference Result 140 states and 156 transitions. [2020-10-13 05:03:50,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-10-13 05:03:50,249 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-10-13 05:03:50,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:50,250 INFO L225 Difference]: With dead ends: 140 [2020-10-13 05:03:50,250 INFO L226 Difference]: Without dead ends: 104 [2020-10-13 05:03:50,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-10-13 05:03:50,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-10-13 05:03:50,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 68. [2020-10-13 05:03:50,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-10-13 05:03:50,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-10-13 05:03:50,258 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 63 [2020-10-13 05:03:50,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:50,260 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-10-13 05:03:50,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-10-13 05:03:50,261 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-10-13 05:03:50,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-10-13 05:03:50,261 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:50,261 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:50,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-10-13 05:03:50,262 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:50,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:50,262 INFO L82 PathProgramCache]: Analyzing trace with hash -2036800950, now seen corresponding path program 34 times [2020-10-13 05:03:50,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:50,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921402183] [2020-10-13 05:03:50,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:50,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:50,301 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:50,435 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:55,290 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:55,290 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 72 [2020-10-13 05:03:55,290 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:03:55,290 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5004 [2020-10-13 05:03:55,290 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:55,290 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 26 [2020-10-13 05:03:55,291 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 38 [2020-10-13 05:03:55,291 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 26 [2020-10-13 05:03:55,291 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:55,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:03:55,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:55,690 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:55,692 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:03:55,693 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:03:55,693 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:03:55,693 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:03:55,693 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:03:55,693 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:03:55,694 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:03:55,694 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:03:55,694 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:03:55,697 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-10-13 05:03:55,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921402183] [2020-10-13 05:03:55,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:03:55,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-10-13 05:03:55,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835239341] [2020-10-13 05:03:55,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-10-13 05:03:55,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:03:55,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-10-13 05:03:55,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-10-13 05:03:55,699 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 28 states. [2020-10-13 05:03:56,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:03:56,243 INFO L93 Difference]: Finished difference Result 154 states and 182 transitions. [2020-10-13 05:03:56,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-10-13 05:03:56,243 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 64 [2020-10-13 05:03:56,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:03:56,245 INFO L225 Difference]: With dead ends: 154 [2020-10-13 05:03:56,245 INFO L226 Difference]: Without dead ends: 144 [2020-10-13 05:03:56,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-10-13 05:03:56,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-10-13 05:03:56,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 69. [2020-10-13 05:03:56,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-10-13 05:03:56,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2020-10-13 05:03:56,252 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 64 [2020-10-13 05:03:56,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:03:56,252 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2020-10-13 05:03:56,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-10-13 05:03:56,252 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2020-10-13 05:03:56,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-10-13 05:03:56,253 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:03:56,253 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:03:56,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-10-13 05:03:56,253 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:03:56,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:03:56,254 INFO L82 PathProgramCache]: Analyzing trace with hash -834180795, now seen corresponding path program 35 times [2020-10-13 05:03:56,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:03:56,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1405555064] [2020-10-13 05:03:56,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:03:56,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:03:56,295 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:03:56,503 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:01,283 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:01,283 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 73 [2020-10-13 05:04:01,283 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:01,283 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5006 [2020-10-13 05:04:01,284 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:01,284 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 27 [2020-10-13 05:04:01,284 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 38 [2020-10-13 05:04:01,284 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 27 [2020-10-13 05:04:01,284 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:01,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:01,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:01,664 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:01,665 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:01,665 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:01,666 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:01,666 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:01,666 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:01,669 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:01,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:01,670 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:01,670 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-10-13 05:04:01,675 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-10-13 05:04:01,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1405555064] [2020-10-13 05:04:01,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:01,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-10-13 05:04:01,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643926504] [2020-10-13 05:04:01,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-10-13 05:04:01,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:01,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-10-13 05:04:01,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-10-13 05:04:01,679 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand 29 states. [2020-10-13 05:04:02,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:02,131 INFO L93 Difference]: Finished difference Result 186 states and 217 transitions. [2020-10-13 05:04:02,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-10-13 05:04:02,132 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-10-13 05:04:02,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:02,133 INFO L225 Difference]: With dead ends: 186 [2020-10-13 05:04:02,134 INFO L226 Difference]: Without dead ends: 149 [2020-10-13 05:04:02,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-10-13 05:04:02,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2020-10-13 05:04:02,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 71. [2020-10-13 05:04:02,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-10-13 05:04:02,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2020-10-13 05:04:02,140 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 65 [2020-10-13 05:04:02,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:02,141 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2020-10-13 05:04:02,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-10-13 05:04:02,141 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2020-10-13 05:04:02,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-10-13 05:04:02,141 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:02,142 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:02,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-10-13 05:04:02,142 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:02,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:02,142 INFO L82 PathProgramCache]: Analyzing trace with hash -337739002, now seen corresponding path program 36 times [2020-10-13 05:04:02,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:02,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1382349089] [2020-10-13 05:04:02,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:02,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:02,173 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:02,372 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:07,176 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:07,176 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 75 [2020-10-13 05:04:07,176 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:07,176 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5018 [2020-10-13 05:04:07,176 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:07,177 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 28 [2020-10-13 05:04:07,177 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 39 [2020-10-13 05:04:07,177 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 28 [2020-10-13 05:04:07,177 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:07,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:07,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:07,614 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:07,615 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:07,615 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:07,615 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:07,615 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:07,615 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:07,616 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:07,616 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:07,616 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:07,616 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:07,620 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2020-10-13 05:04:07,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1382349089] [2020-10-13 05:04:07,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:07,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-10-13 05:04:07,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262252354] [2020-10-13 05:04:07,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-10-13 05:04:07,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:07,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-10-13 05:04:07,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-10-13 05:04:07,622 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand 30 states. [2020-10-13 05:04:08,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:08,282 INFO L93 Difference]: Finished difference Result 192 states and 224 transitions. [2020-10-13 05:04:08,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-10-13 05:04:08,283 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-10-13 05:04:08,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:08,285 INFO L225 Difference]: With dead ends: 192 [2020-10-13 05:04:08,285 INFO L226 Difference]: Without dead ends: 154 [2020-10-13 05:04:08,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-10-13 05:04:08,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-10-13 05:04:08,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 73. [2020-10-13 05:04:08,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-10-13 05:04:08,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2020-10-13 05:04:08,292 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 67 [2020-10-13 05:04:08,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:08,292 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2020-10-13 05:04:08,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-10-13 05:04:08,292 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2020-10-13 05:04:08,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-10-13 05:04:08,293 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:08,293 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:08,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-10-13 05:04:08,294 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:08,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:08,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1996470885, now seen corresponding path program 37 times [2020-10-13 05:04:08,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:08,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1436746866] [2020-10-13 05:04:08,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:08,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:08,333 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:08,514 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:13,318 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:13,319 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 77 [2020-10-13 05:04:13,319 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:13,319 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5002 [2020-10-13 05:04:13,319 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:13,319 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 29 [2020-10-13 05:04:13,319 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 40 [2020-10-13 05:04:13,319 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 29 [2020-10-13 05:04:13,319 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:13,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:13,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:13,777 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:13,778 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:13,778 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:13,778 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:13,778 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:13,778 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:13,779 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:13,779 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:13,779 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:13,779 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:13,783 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2020-10-13 05:04:13,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1436746866] [2020-10-13 05:04:13,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:13,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-10-13 05:04:13,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761054566] [2020-10-13 05:04:13,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-10-13 05:04:13,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:13,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-10-13 05:04:13,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-10-13 05:04:13,784 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 31 states. [2020-10-13 05:04:14,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:14,413 INFO L93 Difference]: Finished difference Result 198 states and 231 transitions. [2020-10-13 05:04:14,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-10-13 05:04:14,413 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-10-13 05:04:14,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:14,415 INFO L225 Difference]: With dead ends: 198 [2020-10-13 05:04:14,416 INFO L226 Difference]: Without dead ends: 159 [2020-10-13 05:04:14,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-10-13 05:04:14,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2020-10-13 05:04:14,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 75. [2020-10-13 05:04:14,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-10-13 05:04:14,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2020-10-13 05:04:14,422 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 69 [2020-10-13 05:04:14,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:14,422 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2020-10-13 05:04:14,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-10-13 05:04:14,422 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2020-10-13 05:04:14,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-10-13 05:04:14,423 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:14,423 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:14,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-10-13 05:04:14,423 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:14,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:14,424 INFO L82 PathProgramCache]: Analyzing trace with hash 620251110, now seen corresponding path program 38 times [2020-10-13 05:04:14,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:14,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1550900688] [2020-10-13 05:04:14,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:14,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:14,454 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:14,683 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:19,460 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:19,460 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 79 [2020-10-13 05:04:19,460 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:19,460 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5017 [2020-10-13 05:04:19,460 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:19,461 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 30 [2020-10-13 05:04:19,461 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 41 [2020-10-13 05:04:19,461 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 30 [2020-10-13 05:04:19,461 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:19,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:19,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:19,948 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:19,949 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:19,949 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:19,949 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:19,949 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:19,949 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:19,949 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:19,950 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:19,950 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:19,950 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:19,954 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2020-10-13 05:04:19,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1550900688] [2020-10-13 05:04:19,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:19,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-10-13 05:04:19,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [3121620] [2020-10-13 05:04:19,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-10-13 05:04:19,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:19,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-10-13 05:04:19,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-10-13 05:04:19,956 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand 32 states. [2020-10-13 05:04:20,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:20,526 INFO L93 Difference]: Finished difference Result 204 states and 238 transitions. [2020-10-13 05:04:20,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-10-13 05:04:20,527 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-10-13 05:04:20,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:20,528 INFO L225 Difference]: With dead ends: 204 [2020-10-13 05:04:20,529 INFO L226 Difference]: Without dead ends: 164 [2020-10-13 05:04:20,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-10-13 05:04:20,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2020-10-13 05:04:20,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 77. [2020-10-13 05:04:20,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-10-13 05:04:20,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2020-10-13 05:04:20,542 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 71 [2020-10-13 05:04:20,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:20,542 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2020-10-13 05:04:20,542 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-10-13 05:04:20,543 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2020-10-13 05:04:20,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-10-13 05:04:20,543 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:20,543 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:20,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-10-13 05:04:20,544 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:20,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:20,544 INFO L82 PathProgramCache]: Analyzing trace with hash -1716386939, now seen corresponding path program 39 times [2020-10-13 05:04:20,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:20,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [35509621] [2020-10-13 05:04:20,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:20,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:20,586 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:20,845 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:25,571 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:25,572 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 81 [2020-10-13 05:04:25,572 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:25,572 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5002 [2020-10-13 05:04:25,572 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:25,572 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 31 [2020-10-13 05:04:25,572 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 42 [2020-10-13 05:04:25,572 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 31 [2020-10-13 05:04:25,572 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:26,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:26,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:26,108 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:26,109 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:26,109 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:26,109 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:26,109 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:26,109 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:26,109 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:26,109 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:26,109 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:26,110 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:26,114 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2020-10-13 05:04:26,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [35509621] [2020-10-13 05:04:26,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:26,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-10-13 05:04:26,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786576970] [2020-10-13 05:04:26,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-10-13 05:04:26,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:26,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-10-13 05:04:26,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-10-13 05:04:26,115 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand 33 states. [2020-10-13 05:04:26,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:26,788 INFO L93 Difference]: Finished difference Result 210 states and 245 transitions. [2020-10-13 05:04:26,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-10-13 05:04:26,788 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-10-13 05:04:26,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:26,791 INFO L225 Difference]: With dead ends: 210 [2020-10-13 05:04:26,791 INFO L226 Difference]: Without dead ends: 169 [2020-10-13 05:04:26,792 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-10-13 05:04:26,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2020-10-13 05:04:26,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 79. [2020-10-13 05:04:26,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-10-13 05:04:26,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2020-10-13 05:04:26,798 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 73 [2020-10-13 05:04:26,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:26,798 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2020-10-13 05:04:26,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-10-13 05:04:26,799 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2020-10-13 05:04:26,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-10-13 05:04:26,799 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:26,799 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:26,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-10-13 05:04:26,800 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:26,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:26,800 INFO L82 PathProgramCache]: Analyzing trace with hash -1173482298, now seen corresponding path program 40 times [2020-10-13 05:04:26,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:26,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727186631] [2020-10-13 05:04:26,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:26,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:26,836 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:27,089 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:31,843 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:31,843 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 83 [2020-10-13 05:04:31,843 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:31,843 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5020 [2020-10-13 05:04:31,843 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:31,843 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 32 [2020-10-13 05:04:31,843 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 43 [2020-10-13 05:04:31,844 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 32 [2020-10-13 05:04:31,844 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:32,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:32,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:32,404 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:32,405 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:32,405 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:32,405 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:32,405 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:32,406 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:32,406 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:32,406 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:32,406 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:32,406 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:32,411 INFO L134 CoverageAnalysis]: Checked inductivity of 930 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2020-10-13 05:04:32,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727186631] [2020-10-13 05:04:32,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:32,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-10-13 05:04:32,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297832170] [2020-10-13 05:04:32,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-10-13 05:04:32,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:32,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-10-13 05:04:32,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-10-13 05:04:32,414 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand 34 states. [2020-10-13 05:04:32,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:32,991 INFO L93 Difference]: Finished difference Result 216 states and 252 transitions. [2020-10-13 05:04:32,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-10-13 05:04:32,992 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-10-13 05:04:32,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:32,994 INFO L225 Difference]: With dead ends: 216 [2020-10-13 05:04:32,994 INFO L226 Difference]: Without dead ends: 174 [2020-10-13 05:04:32,998 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-10-13 05:04:32,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2020-10-13 05:04:33,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 81. [2020-10-13 05:04:33,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-10-13 05:04:33,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2020-10-13 05:04:33,009 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 75 [2020-10-13 05:04:33,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:33,012 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2020-10-13 05:04:33,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-10-13 05:04:33,012 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2020-10-13 05:04:33,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-10-13 05:04:33,014 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:33,014 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:33,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-10-13 05:04:33,014 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:33,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:33,015 INFO L82 PathProgramCache]: Analyzing trace with hash -1528806235, now seen corresponding path program 41 times [2020-10-13 05:04:33,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:33,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311342072] [2020-10-13 05:04:33,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:33,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:33,071 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:33,785 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:38,054 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:38,054 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 85 [2020-10-13 05:04:38,054 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:38,054 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5008 [2020-10-13 05:04:38,055 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:38,055 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 33 [2020-10-13 05:04:38,055 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:04:38,055 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 33 [2020-10-13 05:04:38,055 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:38,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:38,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:38,664 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:38,666 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:38,666 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:38,666 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:38,667 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:38,667 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:38,667 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:38,667 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:38,667 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:38,667 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:38,672 INFO L134 CoverageAnalysis]: Checked inductivity of 992 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 496 trivial. 0 not checked. [2020-10-13 05:04:38,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1311342072] [2020-10-13 05:04:38,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:38,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-10-13 05:04:38,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529169082] [2020-10-13 05:04:38,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-10-13 05:04:38,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:38,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-10-13 05:04:38,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-10-13 05:04:38,674 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand 35 states. [2020-10-13 05:04:39,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:39,052 INFO L93 Difference]: Finished difference Result 173 states and 193 transitions. [2020-10-13 05:04:39,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-10-13 05:04:39,053 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-10-13 05:04:39,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:39,054 INFO L225 Difference]: With dead ends: 173 [2020-10-13 05:04:39,055 INFO L226 Difference]: Without dead ends: 130 [2020-10-13 05:04:39,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-10-13 05:04:39,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-10-13 05:04:39,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 82. [2020-10-13 05:04:39,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-10-13 05:04:39,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-10-13 05:04:39,061 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 77 [2020-10-13 05:04:39,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:39,062 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-10-13 05:04:39,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-10-13 05:04:39,062 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-10-13 05:04:39,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-10-13 05:04:39,063 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:39,063 INFO L422 BasicCegarLoop]: trace histogram [32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:39,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-10-13 05:04:39,063 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:39,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:39,064 INFO L82 PathProgramCache]: Analyzing trace with hash 1987072457, now seen corresponding path program 42 times [2020-10-13 05:04:39,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:39,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511350987] [2020-10-13 05:04:39,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:39,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:39,100 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:39,432 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:44,109 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:44,110 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 86 [2020-10-13 05:04:44,110 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:44,110 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5023 [2020-10-13 05:04:44,110 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:44,110 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 33 [2020-10-13 05:04:44,110 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 45 [2020-10-13 05:04:44,110 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 33 [2020-10-13 05:04:44,111 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:44,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:44,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:44,729 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:44,730 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:44,730 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:44,731 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:44,731 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:44,731 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:44,731 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:44,731 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:44,731 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:44,731 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:44,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2020-10-13 05:04:44,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511350987] [2020-10-13 05:04:44,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:44,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-10-13 05:04:44,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139678670] [2020-10-13 05:04:44,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-10-13 05:04:44,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:44,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-10-13 05:04:44,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-10-13 05:04:44,738 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 35 states. [2020-10-13 05:04:45,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:45,355 INFO L93 Difference]: Finished difference Result 189 states and 224 transitions. [2020-10-13 05:04:45,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-10-13 05:04:45,355 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 78 [2020-10-13 05:04:45,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:45,357 INFO L225 Difference]: With dead ends: 189 [2020-10-13 05:04:45,357 INFO L226 Difference]: Without dead ends: 179 [2020-10-13 05:04:45,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-10-13 05:04:45,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2020-10-13 05:04:45,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 83. [2020-10-13 05:04:45,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-10-13 05:04:45,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2020-10-13 05:04:45,370 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 78 [2020-10-13 05:04:45,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:45,370 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2020-10-13 05:04:45,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-10-13 05:04:45,370 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2020-10-13 05:04:45,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-10-13 05:04:45,373 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:45,373 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:45,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-10-13 05:04:45,373 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:45,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:45,374 INFO L82 PathProgramCache]: Analyzing trace with hash -648156762, now seen corresponding path program 43 times [2020-10-13 05:04:45,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:45,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912710751] [2020-10-13 05:04:45,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:45,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:45,407 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:45,740 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:50,418 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:50,418 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 87 [2020-10-13 05:04:50,418 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:50,419 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5021 [2020-10-13 05:04:50,419 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:50,419 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 34 [2020-10-13 05:04:50,419 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 45 [2020-10-13 05:04:50,419 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 34 [2020-10-13 05:04:50,419 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:51,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:51,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:51,148 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:51,150 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:51,150 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:51,150 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:51,150 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:51,150 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:51,150 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:51,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:51,151 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:51,151 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:51,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1056 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2020-10-13 05:04:51,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912710751] [2020-10-13 05:04:51,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:51,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-10-13 05:04:51,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513258000] [2020-10-13 05:04:51,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-10-13 05:04:51,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:51,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-10-13 05:04:51,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-10-13 05:04:51,158 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand 36 states. [2020-10-13 05:04:51,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:51,795 INFO L93 Difference]: Finished difference Result 228 states and 266 transitions. [2020-10-13 05:04:51,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-10-13 05:04:51,796 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-10-13 05:04:51,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:51,797 INFO L225 Difference]: With dead ends: 228 [2020-10-13 05:04:51,798 INFO L226 Difference]: Without dead ends: 184 [2020-10-13 05:04:51,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-10-13 05:04:51,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-10-13 05:04:51,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 85. [2020-10-13 05:04:51,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-10-13 05:04:51,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2020-10-13 05:04:51,808 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 79 [2020-10-13 05:04:51,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:51,808 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2020-10-13 05:04:51,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-10-13 05:04:51,808 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2020-10-13 05:04:51,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-10-13 05:04:51,813 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:51,813 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:51,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-10-13 05:04:51,814 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:51,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:51,814 INFO L82 PathProgramCache]: Analyzing trace with hash -561218107, now seen corresponding path program 44 times [2020-10-13 05:04:51,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:51,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1626731744] [2020-10-13 05:04:51,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:51,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:51,857 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:52,298 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:56,860 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:56,860 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 89 [2020-10-13 05:04:56,860 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:04:56,860 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5019 [2020-10-13 05:04:56,860 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:56,861 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 35 [2020-10-13 05:04:56,861 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:04:56,861 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 35 [2020-10-13 05:04:56,861 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:57,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:04:57,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:57,548 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:04:57,548 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:04:57,549 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:04:57,549 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:04:57,549 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:04:57,549 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:04:57,549 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:04:57,549 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:04:57,549 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:04:57,549 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:04:57,554 INFO L134 CoverageAnalysis]: Checked inductivity of 1122 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2020-10-13 05:04:57,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1626731744] [2020-10-13 05:04:57,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:04:57,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-10-13 05:04:57,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148074827] [2020-10-13 05:04:57,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-10-13 05:04:57,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:04:57,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-10-13 05:04:57,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-10-13 05:04:57,556 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand 37 states. [2020-10-13 05:04:58,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:04:58,063 INFO L93 Difference]: Finished difference Result 182 states and 203 transitions. [2020-10-13 05:04:58,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-10-13 05:04:58,064 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-10-13 05:04:58,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:04:58,066 INFO L225 Difference]: With dead ends: 182 [2020-10-13 05:04:58,066 INFO L226 Difference]: Without dead ends: 137 [2020-10-13 05:04:58,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-10-13 05:04:58,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2020-10-13 05:04:58,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 86. [2020-10-13 05:04:58,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-10-13 05:04:58,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-10-13 05:04:58,070 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 81 [2020-10-13 05:04:58,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:04:58,071 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-10-13 05:04:58,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-10-13 05:04:58,071 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-10-13 05:04:58,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-10-13 05:04:58,072 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:04:58,072 INFO L422 BasicCegarLoop]: trace histogram [34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:04:58,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-10-13 05:04:58,072 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:04:58,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:04:58,072 INFO L82 PathProgramCache]: Analyzing trace with hash 558455017, now seen corresponding path program 45 times [2020-10-13 05:04:58,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:04:58,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [161888859] [2020-10-13 05:04:58,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:04:58,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:04:58,111 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:01,459 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:03,122 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:03,122 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 90 [2020-10-13 05:05:03,122 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:03,122 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5026 [2020-10-13 05:05:03,122 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:03,122 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 35 [2020-10-13 05:05:03,122 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 47 [2020-10-13 05:05:03,123 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 35 [2020-10-13 05:05:03,123 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:03,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:03,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:03,839 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:03,841 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:03,841 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:03,841 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:03,841 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 05:05:03,842 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:03,842 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:03,842 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:03,842 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:03,842 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:03,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2020-10-13 05:05:03,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [161888859] [2020-10-13 05:05:03,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:03,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-10-13 05:05:03,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503156226] [2020-10-13 05:05:03,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-10-13 05:05:03,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:03,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-10-13 05:05:03,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-10-13 05:05:03,849 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 37 states. [2020-10-13 05:05:04,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:04,614 INFO L93 Difference]: Finished difference Result 199 states and 236 transitions. [2020-10-13 05:05:04,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-10-13 05:05:04,615 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 82 [2020-10-13 05:05:04,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:04,617 INFO L225 Difference]: With dead ends: 199 [2020-10-13 05:05:04,617 INFO L226 Difference]: Without dead ends: 189 [2020-10-13 05:05:04,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-10-13 05:05:04,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-10-13 05:05:04,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 87. [2020-10-13 05:05:04,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-10-13 05:05:04,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2020-10-13 05:05:04,624 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 82 [2020-10-13 05:05:04,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:04,624 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2020-10-13 05:05:04,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-10-13 05:05:04,625 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2020-10-13 05:05:04,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-10-13 05:05:04,626 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:04,626 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:04,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-10-13 05:05:04,626 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:04,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:04,626 INFO L82 PathProgramCache]: Analyzing trace with hash -1985624442, now seen corresponding path program 46 times [2020-10-13 05:05:04,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:04,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567103355] [2020-10-13 05:05:04,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:04,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:04,666 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:08,108 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:09,665 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:09,665 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 91 [2020-10-13 05:05:09,665 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:09,665 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5015 [2020-10-13 05:05:09,666 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:09,666 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 36 [2020-10-13 05:05:09,666 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 47 [2020-10-13 05:05:09,666 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 36 [2020-10-13 05:05:09,666 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:10,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:10,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:10,408 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:10,409 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:10,409 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:10,409 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:10,409 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 05:05:10,409 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:10,409 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:10,410 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:10,410 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:10,410 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:10,416 INFO L134 CoverageAnalysis]: Checked inductivity of 1190 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2020-10-13 05:05:10,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567103355] [2020-10-13 05:05:10,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:10,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-10-13 05:05:10,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357961520] [2020-10-13 05:05:10,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-10-13 05:05:10,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:10,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-10-13 05:05:10,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-10-13 05:05:10,418 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand 38 states. [2020-10-13 05:05:11,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:11,261 INFO L93 Difference]: Finished difference Result 240 states and 280 transitions. [2020-10-13 05:05:11,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-10-13 05:05:11,262 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-10-13 05:05:11,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:11,263 INFO L225 Difference]: With dead ends: 240 [2020-10-13 05:05:11,263 INFO L226 Difference]: Without dead ends: 194 [2020-10-13 05:05:11,264 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-10-13 05:05:11,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2020-10-13 05:05:11,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 89. [2020-10-13 05:05:11,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-10-13 05:05:11,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2020-10-13 05:05:11,270 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 83 [2020-10-13 05:05:11,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:11,270 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2020-10-13 05:05:11,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-10-13 05:05:11,270 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2020-10-13 05:05:11,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-10-13 05:05:11,271 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:11,271 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:11,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-10-13 05:05:11,271 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:11,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:11,272 INFO L82 PathProgramCache]: Analyzing trace with hash -2076659995, now seen corresponding path program 47 times [2020-10-13 05:05:11,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:11,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736256383] [2020-10-13 05:05:11,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:11,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:11,303 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:13,228 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:16,318 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:16,318 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 93 [2020-10-13 05:05:16,318 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:16,319 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5026 [2020-10-13 05:05:16,319 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:16,319 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 37 [2020-10-13 05:05:16,319 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 48 [2020-10-13 05:05:16,319 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 37 [2020-10-13 05:05:16,319 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:17,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:17,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:17,080 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:17,081 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:17,081 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:17,081 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:17,081 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:17,081 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:17,082 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:17,082 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:17,082 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:17,082 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:17,087 INFO L134 CoverageAnalysis]: Checked inductivity of 1260 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-10-13 05:05:17,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736256383] [2020-10-13 05:05:17,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:17,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-10-13 05:05:17,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585971675] [2020-10-13 05:05:17,088 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-10-13 05:05:17,088 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:17,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-10-13 05:05:17,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-10-13 05:05:17,089 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand 39 states. [2020-10-13 05:05:18,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:18,034 INFO L93 Difference]: Finished difference Result 246 states and 287 transitions. [2020-10-13 05:05:18,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-10-13 05:05:18,035 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-10-13 05:05:18,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:18,037 INFO L225 Difference]: With dead ends: 246 [2020-10-13 05:05:18,037 INFO L226 Difference]: Without dead ends: 199 [2020-10-13 05:05:18,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-10-13 05:05:18,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2020-10-13 05:05:18,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 91. [2020-10-13 05:05:18,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-10-13 05:05:18,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2020-10-13 05:05:18,043 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 85 [2020-10-13 05:05:18,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:18,044 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2020-10-13 05:05:18,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-10-13 05:05:18,044 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2020-10-13 05:05:18,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-10-13 05:05:18,044 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:18,045 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:18,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-10-13 05:05:18,045 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:18,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:18,045 INFO L82 PathProgramCache]: Analyzing trace with hash -1977373850, now seen corresponding path program 48 times [2020-10-13 05:05:18,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:18,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [979109011] [2020-10-13 05:05:18,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:18,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:18,075 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:22,158 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:23,076 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:23,076 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 95 [2020-10-13 05:05:23,076 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:23,076 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5013 [2020-10-13 05:05:23,076 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:23,077 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 38 [2020-10-13 05:05:23,077 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 49 [2020-10-13 05:05:23,077 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 38 [2020-10-13 05:05:23,077 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:23,866 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:23,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:23,868 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:23,869 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:23,869 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:23,870 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:23,870 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:23,870 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:23,870 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:23,870 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:23,870 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:23,871 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:23,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1332 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2020-10-13 05:05:23,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [979109011] [2020-10-13 05:05:23,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:23,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-10-13 05:05:23,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462610908] [2020-10-13 05:05:23,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-10-13 05:05:23,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:23,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-10-13 05:05:23,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-10-13 05:05:23,878 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand 40 states. [2020-10-13 05:05:24,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:24,865 INFO L93 Difference]: Finished difference Result 252 states and 294 transitions. [2020-10-13 05:05:24,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-10-13 05:05:24,866 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-10-13 05:05:24,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:24,867 INFO L225 Difference]: With dead ends: 252 [2020-10-13 05:05:24,867 INFO L226 Difference]: Without dead ends: 204 [2020-10-13 05:05:24,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-10-13 05:05:24,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2020-10-13 05:05:24,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 93. [2020-10-13 05:05:24,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-10-13 05:05:24,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2020-10-13 05:05:24,873 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 87 [2020-10-13 05:05:24,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:24,873 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2020-10-13 05:05:24,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-10-13 05:05:24,874 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2020-10-13 05:05:24,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-10-13 05:05:24,874 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:24,874 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:24,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-10-13 05:05:24,875 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:24,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:24,875 INFO L82 PathProgramCache]: Analyzing trace with hash -353970171, now seen corresponding path program 49 times [2020-10-13 05:05:24,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:24,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733236730] [2020-10-13 05:05:24,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:24,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:24,907 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:27,196 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:29,947 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:29,948 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 97 [2020-10-13 05:05:29,948 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:29,948 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5052 [2020-10-13 05:05:29,948 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:29,948 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 39 [2020-10-13 05:05:29,948 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 50 [2020-10-13 05:05:29,948 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 39 [2020-10-13 05:05:29,948 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:30,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:30,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:30,763 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:30,763 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:30,763 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:30,764 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:30,764 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 05:05:30,764 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:30,764 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:30,764 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:30,764 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:30,764 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:30,770 INFO L134 CoverageAnalysis]: Checked inductivity of 1406 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-10-13 05:05:30,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733236730] [2020-10-13 05:05:30,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:30,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-10-13 05:05:30,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558964149] [2020-10-13 05:05:30,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-10-13 05:05:30,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:30,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-10-13 05:05:30,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-10-13 05:05:30,772 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand 41 states. [2020-10-13 05:05:31,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:31,580 INFO L93 Difference]: Finished difference Result 258 states and 301 transitions. [2020-10-13 05:05:31,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-10-13 05:05:31,580 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 89 [2020-10-13 05:05:31,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:31,582 INFO L225 Difference]: With dead ends: 258 [2020-10-13 05:05:31,582 INFO L226 Difference]: Without dead ends: 209 [2020-10-13 05:05:31,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-10-13 05:05:31,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-10-13 05:05:31,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 95. [2020-10-13 05:05:31,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-10-13 05:05:31,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2020-10-13 05:05:31,592 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 89 [2020-10-13 05:05:31,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:31,593 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2020-10-13 05:05:31,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-10-13 05:05:31,593 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2020-10-13 05:05:31,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-10-13 05:05:31,594 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:31,594 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:31,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-10-13 05:05:31,594 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:31,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:31,595 INFO L82 PathProgramCache]: Analyzing trace with hash 848664646, now seen corresponding path program 50 times [2020-10-13 05:05:31,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:31,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2098468481] [2020-10-13 05:05:31,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:31,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:31,646 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:34,197 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:36,665 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:36,666 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 99 [2020-10-13 05:05:36,666 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:36,666 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5040 [2020-10-13 05:05:36,666 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:36,666 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 40 [2020-10-13 05:05:36,666 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 05:05:36,666 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 40 [2020-10-13 05:05:36,666 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:37,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:37,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:37,507 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:37,508 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:37,508 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:37,508 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:37,508 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 05:05:37,508 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:37,508 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:37,509 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:37,509 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:37,509 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:37,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1482 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2020-10-13 05:05:37,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2098468481] [2020-10-13 05:05:37,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:37,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-10-13 05:05:37,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847182625] [2020-10-13 05:05:37,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-10-13 05:05:37,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:37,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-10-13 05:05:37,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-10-13 05:05:37,516 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand 42 states. [2020-10-13 05:05:38,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:38,136 INFO L93 Difference]: Finished difference Result 203 states and 226 transitions. [2020-10-13 05:05:38,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-10-13 05:05:38,137 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 91 [2020-10-13 05:05:38,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:38,139 INFO L225 Difference]: With dead ends: 203 [2020-10-13 05:05:38,139 INFO L226 Difference]: Without dead ends: 153 [2020-10-13 05:05:38,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-10-13 05:05:38,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-10-13 05:05:38,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 96. [2020-10-13 05:05:38,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-10-13 05:05:38,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 98 transitions. [2020-10-13 05:05:38,145 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 98 transitions. Word has length 91 [2020-10-13 05:05:38,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:38,145 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 98 transitions. [2020-10-13 05:05:38,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-10-13 05:05:38,145 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 98 transitions. [2020-10-13 05:05:38,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-10-13 05:05:38,146 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:38,146 INFO L422 BasicCegarLoop]: trace histogram [39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:38,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-10-13 05:05:38,146 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:38,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:38,147 INFO L82 PathProgramCache]: Analyzing trace with hash -815409558, now seen corresponding path program 51 times [2020-10-13 05:05:38,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:38,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1160006980] [2020-10-13 05:05:38,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:38,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:38,189 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:40,831 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:43,209 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:43,209 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 100 [2020-10-13 05:05:43,209 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 05:05:43,210 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5038 [2020-10-13 05:05:43,210 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:43,210 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 40 [2020-10-13 05:05:43,210 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 52 [2020-10-13 05:05:43,210 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 40 [2020-10-13 05:05:43,210 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:44,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 05:05:44,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:44,097 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:44,097 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 05:05:44,098 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-13 05:05:44,098 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 05:05:44,098 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 05:05:44,098 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 05:05:44,098 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 05:05:44,098 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 05:05:44,098 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 05:05:44,098 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 05:05:44,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2020-10-13 05:05:44,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1160006980] [2020-10-13 05:05:44,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 05:05:44,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-10-13 05:05:44,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25057329] [2020-10-13 05:05:44,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-10-13 05:05:44,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 05:05:44,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-10-13 05:05:44,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-10-13 05:05:44,106 INFO L87 Difference]: Start difference. First operand 96 states and 98 transitions. Second operand 42 states. [2020-10-13 05:05:44,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 05:05:44,842 INFO L93 Difference]: Finished difference Result 224 states and 266 transitions. [2020-10-13 05:05:44,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-10-13 05:05:44,843 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 92 [2020-10-13 05:05:44,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 05:05:44,844 INFO L225 Difference]: With dead ends: 224 [2020-10-13 05:05:44,845 INFO L226 Difference]: Without dead ends: 214 [2020-10-13 05:05:44,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-10-13 05:05:44,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-10-13 05:05:44,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 97. [2020-10-13 05:05:44,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-10-13 05:05:44,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2020-10-13 05:05:44,850 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 92 [2020-10-13 05:05:44,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 05:05:44,850 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2020-10-13 05:05:44,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-10-13 05:05:44,850 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2020-10-13 05:05:44,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-10-13 05:05:44,851 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 05:05:44,851 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 05:05:44,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-10-13 05:05:44,851 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 05:05:44,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 05:05:44,851 INFO L82 PathProgramCache]: Analyzing trace with hash -1625753307, now seen corresponding path program 52 times [2020-10-13 05:05:44,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 05:05:44,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070155897] [2020-10-13 05:05:44,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 05:05:44,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 05:05:44,880 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 05:05:47,426 FATAL L256 erpolLogProxyWrapper]: Now shrinking...