/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/loop-acceleration/phases_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-13 10:45:22,358 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-13 10:45:22,361 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-13 10:45:22,384 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-13 10:45:22,384 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-13 10:45:22,385 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-13 10:45:22,387 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-13 10:45:22,388 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-13 10:45:22,390 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-13 10:45:22,391 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-13 10:45:22,392 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-13 10:45:22,393 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-13 10:45:22,393 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-13 10:45:22,394 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-13 10:45:22,395 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-13 10:45:22,396 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-13 10:45:22,397 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-13 10:45:22,398 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-13 10:45:22,399 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-13 10:45:22,401 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-13 10:45:22,403 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-13 10:45:22,404 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-13 10:45:22,405 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-13 10:45:22,406 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-13 10:45:22,408 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-13 10:45:22,409 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-13 10:45:22,409 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-13 10:45:22,410 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-13 10:45:22,410 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-13 10:45:22,411 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-13 10:45:22,412 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-13 10:45:22,412 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-13 10:45:22,413 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-13 10:45:22,414 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-13 10:45:22,415 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-13 10:45:22,415 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-13 10:45:22,416 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-13 10:45:22,416 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-13 10:45:22,416 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-13 10:45:22,417 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-13 10:45:22,417 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-13 10:45:22,418 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-13 10:45:22,440 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-13 10:45:22,440 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-13 10:45:22,441 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-13 10:45:22,441 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-13 10:45:22,442 INFO L138 SettingsManager]: * Use SBE=true [2020-10-13 10:45:22,442 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-13 10:45:22,442 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-13 10:45:22,442 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-13 10:45:22,442 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-13 10:45:22,443 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-13 10:45:22,443 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-13 10:45:22,443 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-13 10:45:22,443 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-13 10:45:22,444 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-13 10:45:22,444 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-13 10:45:22,444 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-13 10:45:22,444 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-13 10:45:22,444 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-13 10:45:22,445 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-13 10:45:22,445 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-13 10:45:22,445 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-13 10:45:22,445 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-13 10:45:22,445 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-13 10:45:22,446 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-13 10:45:22,446 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-13 10:45:22,446 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-13 10:45:22,446 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-13 10:45:22,446 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-13 10:45:22,446 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-13 10:45:22,447 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; [2020-10-13 10:45:22,752 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-13 10:45:22,765 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-13 10:45:22,768 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-13 10:45:22,770 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-13 10:45:22,770 INFO L275 PluginConnector]: CDTParser initialized [2020-10-13 10:45:22,771 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_1-2.c [2020-10-13 10:45:22,844 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0798d75fd/085b8f280fcc4ed699fac8f466c80c1c/FLAGf0ae6fdcb [2020-10-13 10:45:23,262 INFO L306 CDTParser]: Found 1 translation units. [2020-10-13 10:45:23,263 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/phases_1-2.c [2020-10-13 10:45:23,269 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0798d75fd/085b8f280fcc4ed699fac8f466c80c1c/FLAGf0ae6fdcb [2020-10-13 10:45:23,653 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0798d75fd/085b8f280fcc4ed699fac8f466c80c1c [2020-10-13 10:45:23,662 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-13 10:45:23,664 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-13 10:45:23,665 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-13 10:45:23,665 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-13 10:45:23,669 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-13 10:45:23,670 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 10:45:23" (1/1) ... [2020-10-13 10:45:23,673 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@674884e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23, skipping insertion in model container [2020-10-13 10:45:23,674 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 10:45:23" (1/1) ... [2020-10-13 10:45:23,682 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-13 10:45:23,700 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-13 10:45:23,885 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 10:45:23,889 INFO L203 MainTranslator]: Completed pre-run [2020-10-13 10:45:23,909 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 10:45:23,921 INFO L208 MainTranslator]: Completed translation [2020-10-13 10:45:23,921 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23 WrapperNode [2020-10-13 10:45:23,922 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-13 10:45:23,922 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-13 10:45:23,922 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-13 10:45:23,922 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-13 10:45:23,931 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ... [2020-10-13 10:45:23,931 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ... [2020-10-13 10:45:24,011 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ... [2020-10-13 10:45:24,012 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ... [2020-10-13 10:45:24,021 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ... [2020-10-13 10:45:24,026 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ... [2020-10-13 10:45:24,027 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ... [2020-10-13 10:45:24,030 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-13 10:45:24,030 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-13 10:45:24,030 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-13 10:45:24,030 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-13 10:45:24,031 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-13 10:45:24,081 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-13 10:45:24,081 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-13 10:45:24,081 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-13 10:45:24,081 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-13 10:45:24,081 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-13 10:45:24,082 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-13 10:45:24,082 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-13 10:45:24,082 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-13 10:45:24,082 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-13 10:45:24,236 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-13 10:45:24,236 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-13 10:45:24,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 10:45:24 BoogieIcfgContainer [2020-10-13 10:45:24,240 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-13 10:45:24,241 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-13 10:45:24,241 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-13 10:45:24,244 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-13 10:45:24,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 10:45:23" (1/3) ... [2020-10-13 10:45:24,245 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a43e790 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 10:45:24, skipping insertion in model container [2020-10-13 10:45:24,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 10:45:23" (2/3) ... [2020-10-13 10:45:24,246 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a43e790 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 10:45:24, skipping insertion in model container [2020-10-13 10:45:24,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 10:45:24" (3/3) ... [2020-10-13 10:45:24,248 INFO L109 eAbstractionObserver]: Analyzing ICFG phases_1-2.c [2020-10-13 10:45:24,258 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-13 10:45:24,264 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-13 10:45:24,277 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-13 10:45:24,297 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-13 10:45:24,298 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-13 10:45:24,298 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-13 10:45:24,298 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-13 10:45:24,298 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-13 10:45:24,298 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-13 10:45:24,299 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-13 10:45:24,299 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-13 10:45:24,315 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2020-10-13 10:45:24,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-10-13 10:45:24,321 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:24,322 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:24,322 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:24,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:24,328 INFO L82 PathProgramCache]: Analyzing trace with hash -721501374, now seen corresponding path program 1 times [2020-10-13 10:45:24,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:24,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1310242059] [2020-10-13 10:45:24,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:24,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:24,422 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:24,463 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:24,622 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:24,622 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 18 [2020-10-13 10:45:24,622 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:24,623 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 208 [2020-10-13 10:45:24,627 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:24,628 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:24,628 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-13 10:45:24,628 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:24,628 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 5 [2020-10-13 10:45:24,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:24,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:24,662 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:24,674 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:24,675 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:24,675 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:24,675 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 14 [2020-10-13 10:45:24,675 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:24,676 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:24,676 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:24,676 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:24,677 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:45:24,683 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:45:24,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1310242059] [2020-10-13 10:45:24,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 10:45:24,686 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-10-13 10:45:24,686 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402781900] [2020-10-13 10:45:24,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-10-13 10:45:24,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:24,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-10-13 10:45:24,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-13 10:45:24,702 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2020-10-13 10:45:24,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:24,719 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2020-10-13 10:45:24,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-10-13 10:45:24,721 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-10-13 10:45:24,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:24,727 INFO L225 Difference]: With dead ends: 29 [2020-10-13 10:45:24,727 INFO L226 Difference]: Without dead ends: 12 [2020-10-13 10:45:24,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-13 10:45:24,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-10-13 10:45:24,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-10-13 10:45:24,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-10-13 10:45:24,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2020-10-13 10:45:24,762 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 10 [2020-10-13 10:45:24,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:24,763 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2020-10-13 10:45:24,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-10-13 10:45:24,763 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2020-10-13 10:45:24,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-10-13 10:45:24,764 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:24,764 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:24,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-13 10:45:24,765 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:24,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:24,765 INFO L82 PathProgramCache]: Analyzing trace with hash -730736584, now seen corresponding path program 1 times [2020-10-13 10:45:24,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:24,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646261165] [2020-10-13 10:45:24,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:24,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:24,784 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:24,801 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:24,905 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:24,906 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 18 [2020-10-13 10:45:24,906 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:24,906 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 127 [2020-10-13 10:45:24,907 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:24,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:45:24,907 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 10:45:24,908 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 10:45:24,908 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:45:25,071 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2020-10-13 10:45:25,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:25,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:25,075 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:25,077 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:25,077 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:25,078 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:25,078 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 10:45:25,078 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:25,079 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:25,079 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:25,080 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:25,080 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:45:25,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:45:25,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646261165] [2020-10-13 10:45:25,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 10:45:25,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-13 10:45:25,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851396410] [2020-10-13 10:45:25,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-13 10:45:25,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:25,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-13 10:45:25,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-13 10:45:25,086 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 3 states. [2020-10-13 10:45:25,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:25,107 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2020-10-13 10:45:25,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-13 10:45:25,108 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-10-13 10:45:25,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:25,109 INFO L225 Difference]: With dead ends: 21 [2020-10-13 10:45:25,109 INFO L226 Difference]: Without dead ends: 14 [2020-10-13 10:45:25,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-13 10:45:25,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-10-13 10:45:25,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-10-13 10:45:25,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-10-13 10:45:25,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-10-13 10:45:25,116 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2020-10-13 10:45:25,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:25,116 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-10-13 10:45:25,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-13 10:45:25,116 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-10-13 10:45:25,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-10-13 10:45:25,117 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:25,117 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:25,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-13 10:45:25,118 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:25,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:25,118 INFO L82 PathProgramCache]: Analyzing trace with hash -1082855947, now seen corresponding path program 1 times [2020-10-13 10:45:25,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:25,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [179653818] [2020-10-13 10:45:25,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:25,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:25,136 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:25,170 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:25,171 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 20 [2020-10-13 10:45:25,171 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:25,171 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 40 [2020-10-13 10:45:25,171 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:25,172 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-13 10:45:25,172 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:45:25,172 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-13 10:45:25,172 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:25,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:25,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:25,197 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:25,198 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:25,199 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:25,199 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:25,199 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:45:25,199 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:25,199 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:25,200 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:25,200 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:25,200 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:25,202 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:45:25,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [179653818] [2020-10-13 10:45:25,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 10:45:25,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-13 10:45:25,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080286236] [2020-10-13 10:45:25,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-13 10:45:25,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:25,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-13 10:45:25,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-13 10:45:25,205 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2020-10-13 10:45:25,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:25,231 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-10-13 10:45:25,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-13 10:45:25,232 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-10-13 10:45:25,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:25,233 INFO L225 Difference]: With dead ends: 21 [2020-10-13 10:45:25,233 INFO L226 Difference]: Without dead ends: 16 [2020-10-13 10:45:25,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 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 10:45:25,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-10-13 10:45:25,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-10-13 10:45:25,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-10-13 10:45:25,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-10-13 10:45:25,239 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2020-10-13 10:45:25,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:25,239 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-10-13 10:45:25,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-13 10:45:25,239 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-10-13 10:45:25,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-10-13 10:45:25,240 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:25,240 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:25,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-13 10:45:25,241 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:25,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:25,241 INFO L82 PathProgramCache]: Analyzing trace with hash -109889104, now seen corresponding path program 1 times [2020-10-13 10:45:25,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:25,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997059813] [2020-10-13 10:45:25,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:25,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:25,254 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:25,288 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:25,325 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:25,326 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-10-13 10:45:25,326 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:25,326 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 75 [2020-10-13 10:45:25,326 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:25,327 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-13 10:45:25,327 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-13 10:45:25,327 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-13 10:45:25,327 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:45:25,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:25,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:25,378 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:25,379 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:25,379 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:25,380 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:25,380 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:45:25,380 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:25,381 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:25,381 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:25,381 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:25,382 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:45:25,384 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 10:45:25,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997059813] [2020-10-13 10:45:25,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:45:25,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-10-13 10:45:25,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139734463] [2020-10-13 10:45:25,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-13 10:45:25,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:25,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-13 10:45:25,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-13 10:45:25,387 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2020-10-13 10:45:25,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:25,427 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2020-10-13 10:45:25,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-13 10:45:25,428 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2020-10-13 10:45:25,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:25,430 INFO L225 Difference]: With dead ends: 23 [2020-10-13 10:45:25,431 INFO L226 Difference]: Without dead ends: 18 [2020-10-13 10:45:25,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-13 10:45:25,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-10-13 10:45:25,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-10-13 10:45:25,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-10-13 10:45:25,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-10-13 10:45:25,438 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 14 [2020-10-13 10:45:25,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:25,439 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-10-13 10:45:25,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-13 10:45:25,439 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-10-13 10:45:25,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-13 10:45:25,440 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:25,440 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:25,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-13 10:45:25,440 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:25,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:25,441 INFO L82 PathProgramCache]: Analyzing trace with hash -1391623509, now seen corresponding path program 2 times [2020-10-13 10:45:25,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:25,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [876101042] [2020-10-13 10:45:25,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:25,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:25,475 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:25,536 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:25,654 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:25,655 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-10-13 10:45:25,656 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:25,656 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 186 [2020-10-13 10:45:25,656 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:25,656 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-13 10:45:25,656 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 10:45:25,657 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-13 10:45:25,657 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:25,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:25,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:25,710 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:25,713 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:25,713 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:25,713 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:25,713 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 10:45:25,714 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:25,714 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:25,714 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:25,714 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:25,714 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:25,718 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-13 10:45:25,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [876101042] [2020-10-13 10:45:25,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:45:25,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-10-13 10:45:25,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299134163] [2020-10-13 10:45:25,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-13 10:45:25,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:25,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-13 10:45:25,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-13 10:45:25,724 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-10-13 10:45:25,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:25,750 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-10-13 10:45:25,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-13 10:45:25,752 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-10-13 10:45:25,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:25,753 INFO L225 Difference]: With dead ends: 29 [2020-10-13 10:45:25,753 INFO L226 Difference]: Without dead ends: 19 [2020-10-13 10:45:25,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-13 10:45:25,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-10-13 10:45:25,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-10-13 10:45:25,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-10-13 10:45:25,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-10-13 10:45:25,763 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 16 [2020-10-13 10:45:25,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:25,763 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-10-13 10:45:25,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-13 10:45:25,764 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-10-13 10:45:25,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-13 10:45:25,764 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:25,765 INFO L422 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:25,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-13 10:45:25,765 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:25,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:25,766 INFO L82 PathProgramCache]: Analyzing trace with hash -89745752, now seen corresponding path program 3 times [2020-10-13 10:45:25,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:25,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [971049095] [2020-10-13 10:45:25,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:25,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:25,790 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:25,827 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:25,979 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:25,980 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 26 [2020-10-13 10:45:25,980 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:25,980 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 196 [2020-10-13 10:45:25,981 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:25,981 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 10:45:25,981 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-10-13 10:45:25,981 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-13 10:45:25,981 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:26,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:26,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:26,031 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:26,032 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:26,032 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:26,032 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:26,032 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:45:26,033 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:26,033 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:26,033 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:26,033 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:26,034 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:26,036 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-13 10:45:26,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [971049095] [2020-10-13 10:45:26,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:45:26,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 10:45:26,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435116274] [2020-10-13 10:45:26,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 10:45:26,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:26,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 10:45:26,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-13 10:45:26,038 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 5 states. [2020-10-13 10:45:26,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:26,192 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-10-13 10:45:26,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-13 10:45:26,193 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2020-10-13 10:45:26,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:26,194 INFO L225 Difference]: With dead ends: 29 [2020-10-13 10:45:26,194 INFO L226 Difference]: Without dead ends: 24 [2020-10-13 10:45:26,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-10-13 10:45:26,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-13 10:45:26,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2020-10-13 10:45:26,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-10-13 10:45:26,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2020-10-13 10:45:26,201 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 18 [2020-10-13 10:45:26,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:26,202 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2020-10-13 10:45:26,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 10:45:26,202 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2020-10-13 10:45:26,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-13 10:45:26,203 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:26,203 INFO L422 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:26,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-13 10:45:26,203 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:26,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:26,204 INFO L82 PathProgramCache]: Analyzing trace with hash 786268579, now seen corresponding path program 4 times [2020-10-13 10:45:26,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:26,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565317407] [2020-10-13 10:45:26,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:26,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:26,219 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:26,239 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:26,445 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:26,445 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-10-13 10:45:26,445 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:26,452 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 231 [2020-10-13 10:45:26,453 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:26,453 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 10:45:26,453 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 10:45:26,453 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-13 10:45:26,454 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:26,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:26,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:26,504 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:26,505 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:26,505 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:26,505 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:26,506 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:45:26,506 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:26,506 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:26,506 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:26,507 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:26,507 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:45:26,509 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-13 10:45:26,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565317407] [2020-10-13 10:45:26,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:45:26,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-13 10:45:26,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648529908] [2020-10-13 10:45:26,510 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 10:45:26,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:26,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 10:45:26,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-13 10:45:26,511 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 5 states. [2020-10-13 10:45:26,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:26,542 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-10-13 10:45:26,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 10:45:26,543 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-10-13 10:45:26,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:26,544 INFO L225 Difference]: With dead ends: 35 [2020-10-13 10:45:26,544 INFO L226 Difference]: Without dead ends: 23 [2020-10-13 10:45:26,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-13 10:45:26,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-10-13 10:45:26,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-10-13 10:45:26,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-13 10:45:26,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2020-10-13 10:45:26,551 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 20 [2020-10-13 10:45:26,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:26,551 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2020-10-13 10:45:26,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 10:45:26,552 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2020-10-13 10:45:26,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-13 10:45:26,552 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:26,552 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:26,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-13 10:45:26,553 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:26,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:26,553 INFO L82 PathProgramCache]: Analyzing trace with hash 564285216, now seen corresponding path program 5 times [2020-10-13 10:45:26,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:26,554 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423072679] [2020-10-13 10:45:26,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:26,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:26,567 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:26,597 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:26,819 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:26,819 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 30 [2020-10-13 10:45:26,820 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:26,820 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 256 [2020-10-13 10:45:26,820 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:26,820 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-13 10:45:26,820 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 16 [2020-10-13 10:45:26,821 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-13 10:45:26,821 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:26,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:26,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:26,882 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:26,883 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:26,883 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:26,883 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:26,884 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:45:26,884 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:26,884 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:26,884 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:26,884 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:26,885 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:26,887 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-10-13 10:45:26,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423072679] [2020-10-13 10:45:26,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:45:26,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-13 10:45:26,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394169717] [2020-10-13 10:45:26,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-13 10:45:26,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:26,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-13 10:45:26,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-13 10:45:26,890 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 6 states. [2020-10-13 10:45:27,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:27,392 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-10-13 10:45:27,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-13 10:45:27,393 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-10-13 10:45:27,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:27,394 INFO L225 Difference]: With dead ends: 33 [2020-10-13 10:45:27,394 INFO L226 Difference]: Without dead ends: 28 [2020-10-13 10:45:27,395 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-10-13 10:45:27,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-10-13 10:45:27,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 25. [2020-10-13 10:45:27,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-10-13 10:45:27,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-10-13 10:45:27,401 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 22 [2020-10-13 10:45:27,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:27,401 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-10-13 10:45:27,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-13 10:45:27,402 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-10-13 10:45:27,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-13 10:45:27,402 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:27,402 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:27,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-10-13 10:45:27,403 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:27,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:27,403 INFO L82 PathProgramCache]: Analyzing trace with hash -2050163685, now seen corresponding path program 6 times [2020-10-13 10:45:27,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:27,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2884402] [2020-10-13 10:45:27,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:27,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:27,419 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:27,437 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:27,754 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:27,755 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 32 [2020-10-13 10:45:27,755 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:27,755 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 340 [2020-10-13 10:45:27,755 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:27,756 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-13 10:45:27,756 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 10:45:27,756 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-10-13 10:45:27,756 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:27,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:27,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:27,822 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:27,823 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:27,823 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:27,824 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:27,824 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:45:27,824 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:27,824 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:27,825 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:27,825 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:27,825 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:27,827 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 28 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-10-13 10:45:27,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2884402] [2020-10-13 10:45:27,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:45:27,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-13 10:45:27,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541136142] [2020-10-13 10:45:27,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-13 10:45:27,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:27,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-13 10:45:27,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-13 10:45:27,830 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 6 states. [2020-10-13 10:45:27,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:27,870 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2020-10-13 10:45:27,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-13 10:45:27,870 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2020-10-13 10:45:27,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:27,871 INFO L225 Difference]: With dead ends: 41 [2020-10-13 10:45:27,871 INFO L226 Difference]: Without dead ends: 27 [2020-10-13 10:45:27,872 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-13 10:45:27,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-10-13 10:45:27,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-10-13 10:45:27,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-10-13 10:45:27,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-10-13 10:45:27,878 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 24 [2020-10-13 10:45:27,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:27,878 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-10-13 10:45:27,878 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-13 10:45:27,879 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-10-13 10:45:27,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-10-13 10:45:27,879 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:27,880 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:27,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-10-13 10:45:27,880 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:27,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:27,880 INFO L82 PathProgramCache]: Analyzing trace with hash -968572136, now seen corresponding path program 7 times [2020-10-13 10:45:27,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:27,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1239028577] [2020-10-13 10:45:27,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:27,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:27,895 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:27,919 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:28,336 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:28,336 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 34 [2020-10-13 10:45:28,337 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:28,337 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 446 [2020-10-13 10:45:28,337 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:28,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 10:45:28,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 18 [2020-10-13 10:45:28,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-13 10:45:28,338 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:28,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:28,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:28,424 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:28,424 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:28,425 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:28,425 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:28,425 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:45:28,425 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:28,426 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:28,426 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:28,426 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:28,426 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:45:28,429 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 36 proven. 16 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-10-13 10:45:28,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1239028577] [2020-10-13 10:45:28,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:45:28,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-13 10:45:28,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938846042] [2020-10-13 10:45:28,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-13 10:45:28,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:28,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-13 10:45:28,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-10-13 10:45:28,431 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 7 states. [2020-10-13 10:45:34,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:34,117 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-10-13 10:45:34,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-13 10:45:34,121 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2020-10-13 10:45:34,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:34,122 INFO L225 Difference]: With dead ends: 39 [2020-10-13 10:45:34,123 INFO L226 Difference]: Without dead ends: 34 [2020-10-13 10:45:34,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2020-10-13 10:45:34,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-13 10:45:34,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 29. [2020-10-13 10:45:34,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-10-13 10:45:34,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2020-10-13 10:45:34,129 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 26 [2020-10-13 10:45:34,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:34,130 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2020-10-13 10:45:34,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-13 10:45:34,130 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2020-10-13 10:45:34,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-13 10:45:34,131 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:34,131 INFO L422 BasicCegarLoop]: trace histogram [9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:34,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-13 10:45:34,132 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:34,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:34,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1952296429, now seen corresponding path program 8 times [2020-10-13 10:45:34,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:34,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1543349195] [2020-10-13 10:45:34,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:34,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:34,153 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:34,176 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:34,738 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:34,738 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 36 [2020-10-13 10:45:34,739 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:34,739 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 590 [2020-10-13 10:45:34,739 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:34,739 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-13 10:45:34,739 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 10:45:34,740 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-10-13 10:45:34,740 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:34,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:34,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:34,822 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:34,823 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:34,823 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:34,823 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:34,823 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:45:34,823 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:34,824 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:34,824 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:34,824 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:34,824 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:34,826 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 45 proven. 20 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-10-13 10:45:34,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1543349195] [2020-10-13 10:45:34,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:45:34,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-13 10:45:34,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819891821] [2020-10-13 10:45:34,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-13 10:45:34,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:34,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-13 10:45:34,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-10-13 10:45:34,830 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand 7 states. [2020-10-13 10:45:34,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:34,879 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2020-10-13 10:45:34,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-13 10:45:34,880 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2020-10-13 10:45:34,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:34,881 INFO L225 Difference]: With dead ends: 47 [2020-10-13 10:45:34,881 INFO L226 Difference]: Without dead ends: 31 [2020-10-13 10:45:34,882 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-10-13 10:45:34,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-10-13 10:45:34,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-10-13 10:45:34,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-13 10:45:34,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2020-10-13 10:45:34,888 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 28 [2020-10-13 10:45:34,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:34,888 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2020-10-13 10:45:34,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-13 10:45:34,888 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2020-10-13 10:45:34,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-13 10:45:34,889 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:34,889 INFO L422 BasicCegarLoop]: trace histogram [10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:34,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-13 10:45:34,890 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:34,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:34,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1397468528, now seen corresponding path program 9 times [2020-10-13 10:45:34,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:34,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502873532] [2020-10-13 10:45:34,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:34,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:34,903 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:34,929 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:35,635 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:35,636 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 38 [2020-10-13 10:45:35,636 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:35,636 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 736 [2020-10-13 10:45:35,637 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:35,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-10-13 10:45:35,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 20 [2020-10-13 10:45:35,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-10-13 10:45:35,638 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:37,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:37,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:37,855 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:37,856 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:37,856 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:37,856 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:37,857 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:45:37,857 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:37,857 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:37,857 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:37,858 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:37,858 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:45:37,861 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 55 proven. 25 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-10-13 10:45:37,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502873532] [2020-10-13 10:45:37,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:45:37,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-13 10:45:37,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592624442] [2020-10-13 10:45:37,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-13 10:45:37,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:37,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-13 10:45:37,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=38, Unknown=1, NotChecked=0, Total=56 [2020-10-13 10:45:37,864 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand 8 states. [2020-10-13 10:45:38,222 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 17 [2020-10-13 10:45:42,999 WARN L193 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 24 [2020-10-13 10:45:43,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:43,355 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2020-10-13 10:45:43,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-13 10:45:43,356 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 30 [2020-10-13 10:45:43,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:43,357 INFO L225 Difference]: With dead ends: 41 [2020-10-13 10:45:43,357 INFO L226 Difference]: Without dead ends: 36 [2020-10-13 10:45:43,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=49, Invalid=82, Unknown=1, NotChecked=0, Total=132 [2020-10-13 10:45:43,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-13 10:45:43,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2020-10-13 10:45:43,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-10-13 10:45:43,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2020-10-13 10:45:43,364 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 30 [2020-10-13 10:45:43,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:43,364 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2020-10-13 10:45:43,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-13 10:45:43,365 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2020-10-13 10:45:43,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-13 10:45:43,366 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:43,366 INFO L422 BasicCegarLoop]: trace histogram [11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:43,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-10-13 10:45:43,366 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:43,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:43,366 INFO L82 PathProgramCache]: Analyzing trace with hash -1804868725, now seen corresponding path program 10 times [2020-10-13 10:45:43,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:43,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000089619] [2020-10-13 10:45:43,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:43,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:43,379 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:43,401 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:44,197 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:44,197 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-13 10:45:44,198 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:44,199 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 821 [2020-10-13 10:45:44,199 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:44,200 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-10-13 10:45:44,200 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 10:45:44,200 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 13 [2020-10-13 10:45:44,200 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:45:44,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:44,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:44,307 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:44,309 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:44,309 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:44,309 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:44,309 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 10:45:44,310 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:44,310 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:44,310 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:44,310 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:44,310 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:44,313 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 66 proven. 30 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-10-13 10:45:44,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000089619] [2020-10-13 10:45:44,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:45:44,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-13 10:45:44,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635232987] [2020-10-13 10:45:44,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-13 10:45:44,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:44,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-13 10:45:44,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-10-13 10:45:44,320 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand 8 states. [2020-10-13 10:45:44,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:45:44,402 INFO L93 Difference]: Finished difference Result 53 states and 66 transitions. [2020-10-13 10:45:44,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-13 10:45:44,403 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2020-10-13 10:45:44,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:45:44,404 INFO L225 Difference]: With dead ends: 53 [2020-10-13 10:45:44,404 INFO L226 Difference]: Without dead ends: 35 [2020-10-13 10:45:44,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-10-13 10:45:44,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-10-13 10:45:44,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-10-13 10:45:44,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-13 10:45:44,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2020-10-13 10:45:44,412 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 32 [2020-10-13 10:45:44,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:45:44,412 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2020-10-13 10:45:44,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-13 10:45:44,412 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2020-10-13 10:45:44,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-10-13 10:45:44,415 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:45:44,416 INFO L422 BasicCegarLoop]: trace histogram [12, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:45:44,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-10-13 10:45:44,416 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:45:44,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:45:44,416 INFO L82 PathProgramCache]: Analyzing trace with hash -480289400, now seen corresponding path program 11 times [2020-10-13 10:45:44,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:45:44,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153082250] [2020-10-13 10:45:44,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:45:44,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:44,443 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:44,468 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:45,469 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:45,470 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 42 [2020-10-13 10:45:45,470 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:45:45,470 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1043 [2020-10-13 10:45:45,471 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:45,471 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-13 10:45:45,471 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 22 [2020-10-13 10:45:45,471 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 14 [2020-10-13 10:45:45,471 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:45:45,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:45:46,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:45:46,001 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:45:46,001 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:45:46,002 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:45:46,002 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:45:46,002 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:45:46,003 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:45:46,003 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:45:46,003 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:45:46,004 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:45:46,004 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:45:46,010 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 78 proven. 36 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-10-13 10:45:46,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153082250] [2020-10-13 10:45:46,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:45:46,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-10-13 10:45:46,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499330052] [2020-10-13 10:45:46,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-13 10:45:46,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:45:46,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-13 10:45:46,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-10-13 10:45:46,013 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand 9 states. [2020-10-13 10:45:46,273 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 19 [2020-10-13 10:45:46,524 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 19 [2020-10-13 10:46:00,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:46:00,715 INFO L93 Difference]: Finished difference Result 47 states and 57 transitions. [2020-10-13 10:46:00,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-13 10:46:00,715 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2020-10-13 10:46:00,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:46:00,716 INFO L225 Difference]: With dead ends: 47 [2020-10-13 10:46:00,716 INFO L226 Difference]: Without dead ends: 42 [2020-10-13 10:46:00,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2020-10-13 10:46:00,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-10-13 10:46:00,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 37. [2020-10-13 10:46:00,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-10-13 10:46:00,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2020-10-13 10:46:00,725 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 34 [2020-10-13 10:46:00,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:46:00,726 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2020-10-13 10:46:00,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-13 10:46:00,726 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2020-10-13 10:46:00,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-10-13 10:46:00,727 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:46:00,727 INFO L422 BasicCegarLoop]: trace histogram [13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:46:00,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-10-13 10:46:00,727 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:46:00,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:46:00,728 INFO L82 PathProgramCache]: Analyzing trace with hash -864022397, now seen corresponding path program 12 times [2020-10-13 10:46:00,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:46:00,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1362320512] [2020-10-13 10:46:00,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:46:00,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:00,741 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:00,768 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:01,809 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:01,809 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-10-13 10:46:01,809 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:46:01,810 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1072 [2020-10-13 10:46:01,810 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:01,810 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-10-13 10:46:01,810 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 10:46:01,810 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-10-13 10:46:01,810 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:46:01,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:46:01,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:01,915 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:01,917 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:01,917 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:46:01,918 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:46:01,918 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 10:46:01,918 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:01,918 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:46:01,918 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:46:01,918 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:46:01,919 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:46:01,921 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 91 proven. 42 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-10-13 10:46:01,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1362320512] [2020-10-13 10:46:01,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:46:01,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-10-13 10:46:01,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592650097] [2020-10-13 10:46:01,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-13 10:46:01,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:46:01,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-13 10:46:01,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-10-13 10:46:01,924 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand 9 states. [2020-10-13 10:46:02,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:46:02,005 INFO L93 Difference]: Finished difference Result 59 states and 74 transitions. [2020-10-13 10:46:02,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-13 10:46:02,005 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-10-13 10:46:02,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:46:02,006 INFO L225 Difference]: With dead ends: 59 [2020-10-13 10:46:02,006 INFO L226 Difference]: Without dead ends: 39 [2020-10-13 10:46:02,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-10-13 10:46:02,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-10-13 10:46:02,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-10-13 10:46:02,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-10-13 10:46:02,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2020-10-13 10:46:02,017 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 36 [2020-10-13 10:46:02,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:46:02,017 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2020-10-13 10:46:02,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-13 10:46:02,017 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2020-10-13 10:46:02,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-10-13 10:46:02,018 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:46:02,018 INFO L422 BasicCegarLoop]: trace histogram [14, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:46:02,018 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-10-13 10:46:02,019 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:46:02,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:46:02,019 INFO L82 PathProgramCache]: Analyzing trace with hash 553403392, now seen corresponding path program 13 times [2020-10-13 10:46:02,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:46:02,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409261245] [2020-10-13 10:46:02,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:46:02,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:02,030 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:02,062 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:03,199 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:03,200 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 46 [2020-10-13 10:46:03,200 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:46:03,200 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1172 [2020-10-13 10:46:03,200 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:03,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-13 10:46:03,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 24 [2020-10-13 10:46:03,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-10-13 10:46:03,201 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:46:03,445 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:46:03,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:03,446 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:03,447 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:03,447 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:46:03,447 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:46:03,447 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:46:03,447 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:03,448 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:46:03,448 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:46:03,448 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:46:03,448 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:46:03,452 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 105 proven. 49 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-10-13 10:46:03,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409261245] [2020-10-13 10:46:03,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:46:03,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-13 10:46:03,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976353024] [2020-10-13 10:46:03,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-13 10:46:03,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:46:03,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-13 10:46:03,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-10-13 10:46:03,454 INFO L87 Difference]: Start difference. First operand 39 states and 46 transitions. Second operand 10 states. [2020-10-13 10:46:23,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:46:23,913 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2020-10-13 10:46:23,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-13 10:46:23,915 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 38 [2020-10-13 10:46:23,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:46:23,916 INFO L225 Difference]: With dead ends: 50 [2020-10-13 10:46:23,916 INFO L226 Difference]: Without dead ends: 45 [2020-10-13 10:46:23,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 8 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=99, Invalid=171, Unknown=2, NotChecked=0, Total=272 [2020-10-13 10:46:23,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-10-13 10:46:23,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41. [2020-10-13 10:46:23,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-13 10:46:23,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-10-13 10:46:23,925 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 38 [2020-10-13 10:46:23,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:46:23,925 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-10-13 10:46:23,925 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-13 10:46:23,925 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-10-13 10:46:23,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-10-13 10:46:23,926 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:46:23,926 INFO L422 BasicCegarLoop]: trace histogram [15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:46:23,926 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-10-13 10:46:23,926 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:46:23,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:46:23,927 INFO L82 PathProgramCache]: Analyzing trace with hash 377305339, now seen corresponding path program 14 times [2020-10-13 10:46:23,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:46:23,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2141903236] [2020-10-13 10:46:23,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:46:23,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:23,937 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:23,968 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:25,109 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:25,110 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 48 [2020-10-13 10:46:25,110 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:46:25,110 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1175 [2020-10-13 10:46:25,110 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:25,110 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-10-13 10:46:25,110 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 10:46:25,111 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 17 [2020-10-13 10:46:25,111 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:46:25,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:46:25,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:25,229 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:25,229 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:25,230 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:46:25,230 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:46:25,230 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:46:25,230 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:25,230 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:46:25,231 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:46:25,231 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:46:25,231 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:46:25,234 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 120 proven. 56 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-10-13 10:46:25,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2141903236] [2020-10-13 10:46:25,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:46:25,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-13 10:46:25,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636944016] [2020-10-13 10:46:25,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-13 10:46:25,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:46:25,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-13 10:46:25,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-10-13 10:46:25,237 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 10 states. [2020-10-13 10:46:25,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:46:25,338 INFO L93 Difference]: Finished difference Result 65 states and 82 transitions. [2020-10-13 10:46:25,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-13 10:46:25,339 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 40 [2020-10-13 10:46:25,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:46:25,339 INFO L225 Difference]: With dead ends: 65 [2020-10-13 10:46:25,339 INFO L226 Difference]: Without dead ends: 43 [2020-10-13 10:46:25,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-10-13 10:46:25,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-10-13 10:46:25,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-10-13 10:46:25,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-10-13 10:46:25,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-10-13 10:46:25,349 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 40 [2020-10-13 10:46:25,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:46:25,349 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-10-13 10:46:25,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-13 10:46:25,350 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-10-13 10:46:25,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-13 10:46:25,350 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:46:25,350 INFO L422 BasicCegarLoop]: trace histogram [16, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:46:25,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-10-13 10:46:25,351 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:46:25,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:46:25,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1568053768, now seen corresponding path program 15 times [2020-10-13 10:46:25,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:46:25,352 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323692001] [2020-10-13 10:46:25,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:46:25,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:25,361 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:25,395 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:26,890 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:26,890 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50 [2020-10-13 10:46:26,890 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:46:26,891 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1531 [2020-10-13 10:46:26,891 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:26,891 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-13 10:46:26,891 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 26 [2020-10-13 10:46:26,891 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-10-13 10:46:26,891 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:46:27,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:46:27,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:27,135 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:27,135 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:27,135 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:46:27,136 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:46:27,136 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:46:27,136 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:27,136 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:46:27,136 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:46:27,136 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:46:27,137 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:46:27,141 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 136 proven. 64 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-10-13 10:46:27,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323692001] [2020-10-13 10:46:27,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:46:27,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-13 10:46:27,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817077537] [2020-10-13 10:46:27,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-13 10:46:27,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:46:27,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-13 10:46:27,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-10-13 10:46:27,143 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 11 states. [2020-10-13 10:46:31,544 WARN L193 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 47 DAG size of output: 19 [2020-10-13 10:46:33,880 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 19 [2020-10-13 10:46:36,047 WARN L193 SmtUtils]: Spent 1.84 s on a formula simplification. DAG size of input: 47 DAG size of output: 19 [2020-10-13 10:46:44,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:46:44,801 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2020-10-13 10:46:44,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-13 10:46:44,802 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 42 [2020-10-13 10:46:44,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:46:44,802 INFO L225 Difference]: With dead ends: 53 [2020-10-13 10:46:44,802 INFO L226 Difference]: Without dead ends: 48 [2020-10-13 10:46:44,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 9 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=104, Invalid=201, Unknown=1, NotChecked=0, Total=306 [2020-10-13 10:46:44,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-13 10:46:44,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 45. [2020-10-13 10:46:44,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-10-13 10:46:44,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2020-10-13 10:46:44,810 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 42 [2020-10-13 10:46:44,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:46:44,811 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2020-10-13 10:46:44,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-13 10:46:44,811 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2020-10-13 10:46:44,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-10-13 10:46:44,812 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:46:44,812 INFO L422 BasicCegarLoop]: trace histogram [17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:46:44,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-10-13 10:46:44,812 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:46:44,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:46:44,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1766440179, now seen corresponding path program 16 times [2020-10-13 10:46:44,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:46:44,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1295988592] [2020-10-13 10:46:44,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:46:44,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:44,823 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:44,853 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:46,736 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:46,736 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 52 [2020-10-13 10:46:46,736 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:46:46,737 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1916 [2020-10-13 10:46:46,737 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:46,737 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-13 10:46:46,738 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 10:46:46,738 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 19 [2020-10-13 10:46:46,738 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 10:46:46,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:46:46,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:46,884 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:46,885 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:46,885 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:46:46,885 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:46:46,885 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:46:46,886 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:46,886 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:46:46,886 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:46:46,886 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:46:46,886 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:46:46,890 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 153 proven. 72 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-10-13 10:46:46,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1295988592] [2020-10-13 10:46:46,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:46:46,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-13 10:46:46,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990205866] [2020-10-13 10:46:46,892 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-13 10:46:46,892 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:46:46,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-13 10:46:46,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-10-13 10:46:46,893 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand 11 states. [2020-10-13 10:46:47,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:46:47,012 INFO L93 Difference]: Finished difference Result 71 states and 90 transitions. [2020-10-13 10:46:47,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-13 10:46:47,012 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 44 [2020-10-13 10:46:47,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:46:47,013 INFO L225 Difference]: With dead ends: 71 [2020-10-13 10:46:47,013 INFO L226 Difference]: Without dead ends: 47 [2020-10-13 10:46:47,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-10-13 10:46:47,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-10-13 10:46:47,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-10-13 10:46:47,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-10-13 10:46:47,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 56 transitions. [2020-10-13 10:46:47,025 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 56 transitions. Word has length 44 [2020-10-13 10:46:47,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:46:47,025 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 56 transitions. [2020-10-13 10:46:47,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-13 10:46:47,025 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 56 transitions. [2020-10-13 10:46:47,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-10-13 10:46:47,026 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:46:47,026 INFO L422 BasicCegarLoop]: trace histogram [18, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:46:47,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-10-13 10:46:47,026 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:46:47,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:46:47,027 INFO L82 PathProgramCache]: Analyzing trace with hash -1991433360, now seen corresponding path program 17 times [2020-10-13 10:46:47,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:46:47,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654700410] [2020-10-13 10:46:47,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:46:47,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:47,045 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:47,088 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:48,629 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:48,629 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 54 [2020-10-13 10:46:48,629 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:46:48,629 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1591 [2020-10-13 10:46:48,629 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:48,629 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 11 [2020-10-13 10:46:48,630 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 28 [2020-10-13 10:46:48,630 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 20 [2020-10-13 10:46:48,630 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:46:55,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:46:55,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:46:55,069 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:46:55,070 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:46:55,070 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:46:55,070 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:46:55,070 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:46:55,070 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:46:55,071 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:46:55,071 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:46:55,071 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:46:55,071 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:46:55,076 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 171 proven. 75 refuted. 6 times theorem prover too weak. 72 trivial. 0 not checked. [2020-10-13 10:46:55,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654700410] [2020-10-13 10:46:55,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:46:55,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-13 10:46:55,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747251368] [2020-10-13 10:46:55,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-13 10:46:55,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:46:55,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-13 10:46:55,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=99, Unknown=3, NotChecked=0, Total=132 [2020-10-13 10:46:55,078 INFO L87 Difference]: Start difference. First operand 47 states and 56 transitions. Second operand 12 states. [2020-10-13 10:46:56,282 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 17 [2020-10-13 10:46:58,765 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 17 [2020-10-13 10:47:05,194 WARN L193 SmtUtils]: Spent 2.20 s on a formula simplification. DAG size of input: 45 DAG size of output: 17 [2020-10-13 10:47:07,531 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 17 [2020-10-13 10:47:12,063 WARN L193 SmtUtils]: Spent 2.29 s on a formula simplification. DAG size of input: 38 DAG size of output: 17 [2020-10-13 10:47:19,077 WARN L193 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 24 DAG size of output: 17 [2020-10-13 10:47:24,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:47:24,018 INFO L93 Difference]: Finished difference Result 57 states and 69 transitions. [2020-10-13 10:47:24,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-13 10:47:24,024 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 46 [2020-10-13 10:47:24,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:47:24,025 INFO L225 Difference]: With dead ends: 57 [2020-10-13 10:47:24,025 INFO L226 Difference]: Without dead ends: 52 [2020-10-13 10:47:24,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 29.7s TimeCoverageRelationStatistics Valid=144, Invalid=270, Unknown=6, NotChecked=0, Total=420 [2020-10-13 10:47:24,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-10-13 10:47:24,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 49. [2020-10-13 10:47:24,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-10-13 10:47:24,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2020-10-13 10:47:24,033 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 46 [2020-10-13 10:47:24,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:47:24,034 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2020-10-13 10:47:24,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-13 10:47:24,034 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2020-10-13 10:47:24,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-10-13 10:47:24,035 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:47:24,035 INFO L422 BasicCegarLoop]: trace histogram [19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:47:24,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-10-13 10:47:24,035 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:47:24,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:47:24,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1374421909, now seen corresponding path program 18 times [2020-10-13 10:47:24,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:47:24,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913753439] [2020-10-13 10:47:24,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:47:24,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:47:24,045 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:47:24,107 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:47:25,337 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:47:25,337 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 56 [2020-10-13 10:47:25,337 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:47:25,338 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1295 [2020-10-13 10:47:25,338 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:47:25,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 11 [2020-10-13 10:47:25,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 10:47:25,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-10-13 10:47:25,338 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:47:25,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:47:25,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:47:25,487 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:47:25,488 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:47:25,488 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:47:25,488 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:47:25,489 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:47:25,489 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:47:25,489 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:47:25,489 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:47:25,489 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:47:25,490 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:47:25,493 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 190 proven. 90 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-10-13 10:47:25,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913753439] [2020-10-13 10:47:25,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:47:25,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-13 10:47:25,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960506232] [2020-10-13 10:47:25,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-13 10:47:25,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:47:25,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-13 10:47:25,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-10-13 10:47:25,495 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand 12 states. [2020-10-13 10:47:25,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:47:25,669 INFO L93 Difference]: Finished difference Result 77 states and 98 transitions. [2020-10-13 10:47:25,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-13 10:47:25,670 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 48 [2020-10-13 10:47:25,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:47:25,671 INFO L225 Difference]: With dead ends: 77 [2020-10-13 10:47:25,671 INFO L226 Difference]: Without dead ends: 51 [2020-10-13 10:47:25,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-10-13 10:47:25,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-10-13 10:47:25,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-10-13 10:47:25,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-10-13 10:47:25,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2020-10-13 10:47:25,687 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 48 [2020-10-13 10:47:25,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:47:25,688 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2020-10-13 10:47:25,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-13 10:47:25,688 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2020-10-13 10:47:25,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-10-13 10:47:25,689 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:47:25,689 INFO L422 BasicCegarLoop]: trace histogram [20, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:47:25,689 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-10-13 10:47:25,689 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:47:25,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:47:25,689 INFO L82 PathProgramCache]: Analyzing trace with hash -1193943960, now seen corresponding path program 19 times [2020-10-13 10:47:25,690 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:47:25,690 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [791874826] [2020-10-13 10:47:25,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:47:25,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:47:25,706 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:47:25,747 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:47:27,480 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:47:27,480 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 58 [2020-10-13 10:47:27,480 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:47:27,481 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1779 [2020-10-13 10:47:27,481 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:47:27,481 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-10-13 10:47:27,481 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 30 [2020-10-13 10:47:27,482 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 22 [2020-10-13 10:47:27,482 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:47:36,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:47:36,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:47:36,024 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:47:36,025 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:47:36,025 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:47:36,025 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:47:36,025 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:47:36,025 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:47:36,026 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:47:36,026 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:47:36,026 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:47:36,026 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:47:36,030 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 210 proven. 94 refuted. 6 times theorem prover too weak. 90 trivial. 0 not checked. [2020-10-13 10:47:36,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [791874826] [2020-10-13 10:47:36,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:47:36,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-10-13 10:47:36,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771895076] [2020-10-13 10:47:36,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-13 10:47:36,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:47:36,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-13 10:47:36,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=120, Unknown=4, NotChecked=0, Total=156 [2020-10-13 10:47:36,032 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand 13 states. [2020-10-13 10:47:38,438 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 17 [2020-10-13 10:47:41,200 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 17 [2020-10-13 10:47:44,018 WARN L193 SmtUtils]: Spent 2.23 s on a formula simplification. DAG size of input: 59 DAG size of output: 17 [2020-10-13 10:47:47,696 WARN L193 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 17 [2020-10-13 10:47:52,574 WARN L193 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 17 [2020-10-13 10:47:56,726 WARN L193 SmtUtils]: Spent 1.15 s on a formula simplification. DAG size of input: 52 DAG size of output: 17 [2020-10-13 10:48:06,388 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 17 [2020-10-13 10:48:07,140 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 17 [2020-10-13 10:48:22,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:48:22,755 INFO L93 Difference]: Finished difference Result 66 states and 81 transitions. [2020-10-13 10:48:22,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-10-13 10:48:22,757 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 50 [2020-10-13 10:48:22,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:48:22,758 INFO L225 Difference]: With dead ends: 66 [2020-10-13 10:48:22,758 INFO L226 Difference]: Without dead ends: 61 [2020-10-13 10:48:22,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 28.2s TimeCoverageRelationStatistics Valid=198, Invalid=395, Unknown=7, NotChecked=0, Total=600 [2020-10-13 10:48:22,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-10-13 10:48:22,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-10-13 10:48:22,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-10-13 10:48:22,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 64 transitions. [2020-10-13 10:48:22,767 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 64 transitions. Word has length 50 [2020-10-13 10:48:22,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:48:22,767 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 64 transitions. [2020-10-13 10:48:22,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-13 10:48:22,767 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 64 transitions. [2020-10-13 10:48:22,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-10-13 10:48:22,768 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:48:22,768 INFO L422 BasicCegarLoop]: trace histogram [21, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:48:22,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-10-13 10:48:22,769 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:48:22,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:48:22,769 INFO L82 PathProgramCache]: Analyzing trace with hash 508712803, now seen corresponding path program 20 times [2020-10-13 10:48:22,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:48:22,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913554610] [2020-10-13 10:48:22,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:48:22,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:48:22,786 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:48:22,818 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:48:25,013 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:48:25,014 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 60 [2020-10-13 10:48:25,014 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:48:25,014 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2233 [2020-10-13 10:48:25,014 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:48:25,014 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 12 [2020-10-13 10:48:25,014 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 10:48:25,014 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-10-13 10:48:25,014 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:48:25,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:48:25,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:48:25,182 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:48:25,183 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:48:25,183 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:48:25,184 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:48:25,184 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-13 10:48:25,184 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:48:25,184 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:48:25,184 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:48:25,185 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:48:25,185 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:48:25,188 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 231 proven. 110 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-10-13 10:48:25,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913554610] [2020-10-13 10:48:25,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:48:25,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-10-13 10:48:25,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366397631] [2020-10-13 10:48:25,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-13 10:48:25,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:48:25,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-13 10:48:25,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-10-13 10:48:25,190 INFO L87 Difference]: Start difference. First operand 53 states and 64 transitions. Second operand 13 states. [2020-10-13 10:48:25,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 10:48:25,378 INFO L93 Difference]: Finished difference Result 83 states and 106 transitions. [2020-10-13 10:48:25,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-13 10:48:25,380 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 52 [2020-10-13 10:48:25,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 10:48:25,381 INFO L225 Difference]: With dead ends: 83 [2020-10-13 10:48:25,381 INFO L226 Difference]: Without dead ends: 55 [2020-10-13 10:48:25,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-10-13 10:48:25,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-10-13 10:48:25,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-10-13 10:48:25,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-10-13 10:48:25,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 66 transitions. [2020-10-13 10:48:25,389 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 66 transitions. Word has length 52 [2020-10-13 10:48:25,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 10:48:25,389 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 66 transitions. [2020-10-13 10:48:25,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-13 10:48:25,389 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 66 transitions. [2020-10-13 10:48:25,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-10-13 10:48:25,390 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 10:48:25,390 INFO L422 BasicCegarLoop]: trace histogram [22, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 10:48:25,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-10-13 10:48:25,390 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 10:48:25,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 10:48:25,390 INFO L82 PathProgramCache]: Analyzing trace with hash 888795360, now seen corresponding path program 21 times [2020-10-13 10:48:25,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 10:48:25,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [155434513] [2020-10-13 10:48:25,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 10:48:25,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:48:25,405 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:48:25,443 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:48:27,637 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:48:27,637 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 62 [2020-10-13 10:48:27,638 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 10:48:27,638 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2237 [2020-10-13 10:48:27,638 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:48:27,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 13 [2020-10-13 10:48:27,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 32 [2020-10-13 10:48:27,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 24 [2020-10-13 10:48:27,638 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:48:34,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 10:48:34,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 10:48:34,167 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 10:48:34,168 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 10:48:34,168 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 10:48:34,168 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 10:48:34,168 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 0 [2020-10-13 10:48:34,168 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 10:48:34,169 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 10:48:34,169 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 10:48:34,169 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 10:48:34,169 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 10:48:34,173 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 253 proven. 115 refuted. 6 times theorem prover too weak. 110 trivial. 0 not checked. [2020-10-13 10:48:34,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [155434513] [2020-10-13 10:48:34,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 10:48:34,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-10-13 10:48:34,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995850156] [2020-10-13 10:48:34,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-13 10:48:34,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 10:48:34,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-13 10:48:34,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=143, Unknown=3, NotChecked=0, Total=182 [2020-10-13 10:48:34,175 INFO L87 Difference]: Start difference. First operand 55 states and 66 transitions. Second operand 14 states. [2020-10-13 10:48:37,424 WARN L193 SmtUtils]: Spent 736.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 17 [2020-10-13 10:48:41,484 WARN L193 SmtUtils]: Spent 3.34 s on a formula simplification. DAG size of input: 80 DAG size of output: 17 [2020-10-13 10:48:42,410 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 17 [2020-10-13 10:48:51,116 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 17 [2020-10-13 10:48:55,875 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 17 [2020-10-13 10:48:58,692 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 17 [2020-10-13 10:49:47,868 WARN L193 SmtUtils]: Spent 2.48 s on a formula simplification. DAG size of input: 73 DAG size of output: 17