/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=1000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_12.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 12:36:54,262 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 12:36:54,267 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 12:36:54,315 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 12:36:54,316 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 12:36:54,328 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 12:36:54,330 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 12:36:54,333 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 12:36:54,337 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 12:36:54,341 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 12:36:54,342 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 12:36:54,343 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 12:36:54,343 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 12:36:54,347 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 12:36:54,350 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 12:36:54,352 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 12:36:54,353 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 12:36:54,354 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 12:36:54,357 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 12:36:54,367 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 12:36:54,369 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 12:36:54,371 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 12:36:54,372 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 12:36:54,373 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 12:36:54,376 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-21 12:36:54,376 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-21 12:36:54,377 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-21 12:36:54,380 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-21 12:36:54,380 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-21 12:36:54,382 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-21 12:36:54,383 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 12:36:54,384 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 12:36:54,384 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 12:36:54,385 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 12:36:54,387 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 12:36:54,387 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 12:36:54,388 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 12:36:54,388 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 12:36:54,388 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 12:36:54,390 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 12:36:54,391 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 12:36:54,392 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 [2020-09-21 12:36:54,438 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 12:36:54,439 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 12:36:54,441 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 12:36:54,441 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 12:36:54,442 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 12:36:54,442 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 12:36:54,442 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 12:36:54,443 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 12:36:54,443 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 12:36:54,443 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 12:36:54,444 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 12:36:54,444 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 12:36:54,445 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 12:36:54,445 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 12:36:54,445 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 12:36:54,445 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 12:36:54,446 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 12:36:54,446 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 12:36:54,446 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 12:36:54,446 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 12:36:54,446 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 12:36:54,447 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 12:36:54,447 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 12:36:54,447 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 12:36:54,447 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 12:36:54,448 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 12:36:54,448 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 12:36:54,448 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 12:36:54,448 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 12:36:54,448 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=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=1000;interpolation-heuristic=SMALLEST;log-additional-information=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=1000;interpolation-heuristic=SMALLEST;log-additional-information=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=1000;interpolation-heuristic=SMALLEST;log-additional-information=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=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-09-21 12:36:54,903 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 12:36:54,929 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 12:36:54,934 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 12:36:54,936 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 12:36:54,936 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 12:36:54,938 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_12.c [2020-09-21 12:36:55,028 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/78947892a/1bba238a4bc04625974cc1b053e6ba73/FLAG16e0c3ed7 [2020-09-21 12:36:55,550 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 12:36:55,551 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops-crafted-1/mono-crafted_12.c [2020-09-21 12:36:55,559 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/78947892a/1bba238a4bc04625974cc1b053e6ba73/FLAG16e0c3ed7 [2020-09-21 12:36:55,886 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/78947892a/1bba238a4bc04625974cc1b053e6ba73 [2020-09-21 12:36:55,900 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 12:36:55,906 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 12:36:55,907 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 12:36:55,910 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 12:36:55,914 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 12:36:55,916 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 12:36:55" (1/1) ... [2020-09-21 12:36:55,920 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55e164ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 12:36:55, skipping insertion in model container [2020-09-21 12:36:55,921 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 12:36:55" (1/1) ... [2020-09-21 12:36:55,931 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 12:36:55,955 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 12:36:56,170 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 12:36:56,176 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 12:36:56,194 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 12:36:56,209 INFO L208 MainTranslator]: Completed translation [2020-09-21 12:36:56,209 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 12:36:56 WrapperNode [2020-09-21 12:36:56,209 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 12:36:56,210 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 12:36:56,210 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 12:36:56,211 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 12:36:56,224 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 12:36:56" (1/1) ... [2020-09-21 12:36:56,225 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 12:36:56" (1/1) ... [2020-09-21 12:36:56,231 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 12:36:56" (1/1) ... [2020-09-21 12:36:56,231 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 12:36:56" (1/1) ... [2020-09-21 12:36:56,235 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 12:36:56" (1/1) ... [2020-09-21 12:36:56,241 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 12:36:56" (1/1) ... [2020-09-21 12:36:56,242 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 12:36:56" (1/1) ... [2020-09-21 12:36:56,318 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 12:36:56,319 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 12:36:56,319 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 12:36:56,319 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 12:36:56,320 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 12:36:56" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 12:36:56,405 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 12:36:56,406 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 12:36:56,406 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 12:36:56,406 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 12:36:56,406 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 12:36:56,407 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 12:36:56,407 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 12:36:56,408 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 12:36:56,409 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 12:36:56,616 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 12:36:56,616 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-21 12:36:56,621 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 12:36:56 BoogieIcfgContainer [2020-09-21 12:36:56,622 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 12:36:56,623 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 12:36:56,623 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 12:36:56,627 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 12:36:56,628 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 12:36:55" (1/3) ... [2020-09-21 12:36:56,629 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50d04bb7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 12:36:56, skipping insertion in model container [2020-09-21 12:36:56,629 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 12:36:56" (2/3) ... [2020-09-21 12:36:56,629 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50d04bb7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 12:36:56, skipping insertion in model container [2020-09-21 12:36:56,630 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 12:36:56" (3/3) ... [2020-09-21 12:36:56,632 INFO L109 eAbstractionObserver]: Analyzing ICFG mono-crafted_12.c [2020-09-21 12:36:56,645 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 12:36:56,655 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 12:36:56,682 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 12:36:56,723 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 12:36:56,723 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 12:36:56,723 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 12:36:56,724 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 12:36:56,724 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 12:36:56,724 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 12:36:56,724 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 12:36:56,725 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 12:36:56,755 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-09-21 12:36:56,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-09-21 12:36:56,764 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:36:56,765 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:36:56,766 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:36:56,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:36:56,775 INFO L82 PathProgramCache]: Analyzing trace with hash -147882559, now seen corresponding path program 1 times [2020-09-21 12:36:56,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:36:56,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1522589835] [2020-09-21 12:36:56,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:36:56,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:56,906 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:56,966 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:57,033 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:57,033 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 19 [2020-09-21 12:36:57,033 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-21 12:36:57,034 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 137 [2020-09-21 12:36:57,037 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:57,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:36:57,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-09-21 12:36:57,038 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:36:57,038 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-09-21 12:36:57,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:36:57,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:57,069 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:57,071 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:57,071 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:36:57,071 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:36:57,072 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-09-21 12:36:57,072 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:57,072 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:36:57,072 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:36:57,073 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:36:57,073 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 12:36:57,079 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 12:36:57,080 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1522589835] [2020-09-21 12:36:57,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 12:36:57,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-21 12:36:57,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898490401] [2020-09-21 12:36:57,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-21 12:36:57,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:36:57,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-21 12:36:57,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-21 12:36:57,112 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-09-21 12:36:57,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:36:57,139 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-09-21 12:36:57,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-21 12:36:57,140 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-09-21 12:36:57,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:36:57,151 INFO L225 Difference]: With dead ends: 32 [2020-09-21 12:36:57,151 INFO L226 Difference]: Without dead ends: 13 [2020-09-21 12:36:57,155 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 [2020-09-21 12:36:57,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-09-21 12:36:57,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-09-21 12:36:57,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-09-21 12:36:57,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-09-21 12:36:57,200 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-09-21 12:36:57,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:36:57,201 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-09-21 12:36:57,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-21 12:36:57,201 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-09-21 12:36:57,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-09-21 12:36:57,202 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:36:57,202 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:36:57,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 12:36:57,203 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:36:57,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:36:57,203 INFO L82 PathProgramCache]: Analyzing trace with hash -158041290, now seen corresponding path program 1 times [2020-09-21 12:36:57,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:36:57,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847163282] [2020-09-21 12:36:57,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:36:57,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:57,274 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:57,371 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:57,383 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:57,383 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 19 [2020-09-21 12:36:57,383 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-21 12:36:57,384 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 140 [2020-09-21 12:36:57,384 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:57,384 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-21 12:36:57,384 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:36:57,385 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-09-21 12:36:57,385 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:36:57,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:36:57,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:57,481 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:57,483 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:57,483 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:36:57,484 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:36:57,484 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 12:36:57,484 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:57,484 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:36:57,485 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:36:57,485 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:36:57,485 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 12:36:57,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 12:36:57,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847163282] [2020-09-21 12:36:57,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 12:36:57,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 12:36:57,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235768278] [2020-09-21 12:36:57,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 12:36:57,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:36:57,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 12:36:57,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 12:36:57,496 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2020-09-21 12:36:57,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:36:57,535 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-09-21 12:36:57,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 12:36:57,536 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-09-21 12:36:57,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:36:57,537 INFO L225 Difference]: With dead ends: 21 [2020-09-21 12:36:57,538 INFO L226 Difference]: Without dead ends: 16 [2020-09-21 12:36:57,539 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 [2020-09-21 12:36:57,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-21 12:36:57,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2020-09-21 12:36:57,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-09-21 12:36:57,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-09-21 12:36:57,545 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2020-09-21 12:36:57,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:36:57,545 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-09-21 12:36:57,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 12:36:57,545 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-09-21 12:36:57,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-09-21 12:36:57,546 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:36:57,546 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:36:57,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 12:36:57,547 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:36:57,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:36:57,547 INFO L82 PathProgramCache]: Analyzing trace with hash 743821333, now seen corresponding path program 1 times [2020-09-21 12:36:57,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:36:57,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802276288] [2020-09-21 12:36:57,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:36:57,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:57,572 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:57,601 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:57,731 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:57,731 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-09-21 12:36:57,731 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-21 12:36:57,732 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 168 [2020-09-21 12:36:57,732 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:57,732 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-21 12:36:57,732 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:36:57,732 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 3 [2020-09-21 12:36:57,733 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:36:57,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:36:57,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:57,787 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:57,789 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:57,789 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:36:57,790 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:36:57,790 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-09-21 12:36:57,790 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:57,790 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:36:57,790 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:36:57,791 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:36:57,792 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 12:36:57,799 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 12:36:57,800 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1802276288] [2020-09-21 12:36:57,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 12:36:57,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 12:36:57,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016993974] [2020-09-21 12:36:57,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 12:36:57,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:36:57,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 12:36:57,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 12:36:57,802 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2020-09-21 12:36:57,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:36:57,843 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-09-21 12:36:57,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 12:36:57,845 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-09-21 12:36:57,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:36:57,846 INFO L225 Difference]: With dead ends: 24 [2020-09-21 12:36:57,846 INFO L226 Difference]: Without dead ends: 16 [2020-09-21 12:36:57,847 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 [2020-09-21 12:36:57,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-21 12:36:57,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-09-21 12:36:57,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-09-21 12:36:57,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-09-21 12:36:57,855 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-09-21 12:36:57,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:36:57,856 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-09-21 12:36:57,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 12:36:57,856 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-09-21 12:36:57,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-09-21 12:36:57,857 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:36:57,857 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:36:57,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 12:36:57,858 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:36:57,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:36:57,859 INFO L82 PathProgramCache]: Analyzing trace with hash -1776138601, now seen corresponding path program 1 times [2020-09-21 12:36:57,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:36:57,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [770074502] [2020-09-21 12:36:57,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:36:57,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:57,908 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:57,944 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:58,107 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:58,108 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-09-21 12:36:58,108 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-21 12:36:58,108 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 225 [2020-09-21 12:36:58,109 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:58,112 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-21 12:36:58,129 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:36:58,129 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-09-21 12:36:58,129 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 20 [2020-09-21 12:36:58,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:36:58,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:58,244 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:58,246 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:58,246 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:36:58,246 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:36:58,247 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-09-21 12:36:58,247 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:58,248 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:36:58,248 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:36:58,248 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:36:58,249 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 12:36:58,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 12:36:58,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [770074502] [2020-09-21 12:36:58,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:36:58,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-09-21 12:36:58,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703199681] [2020-09-21 12:36:58,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 12:36:58,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:36:58,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 12:36:58,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-09-21 12:36:58,260 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2020-09-21 12:36:58,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:36:58,313 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-09-21 12:36:58,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 12:36:58,314 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2020-09-21 12:36:58,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:36:58,315 INFO L225 Difference]: With dead ends: 24 [2020-09-21 12:36:58,315 INFO L226 Difference]: Without dead ends: 19 [2020-09-21 12:36:58,316 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 [2020-09-21 12:36:58,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-09-21 12:36:58,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-09-21 12:36:58,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-21 12:36:58,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-09-21 12:36:58,329 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-09-21 12:36:58,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:36:58,330 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-09-21 12:36:58,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 12:36:58,330 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-09-21 12:36:58,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-21 12:36:58,331 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:36:58,331 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:36:58,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 12:36:58,332 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:36:58,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:36:58,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1575207660, now seen corresponding path program 1 times [2020-09-21 12:36:58,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:36:58,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107503635] [2020-09-21 12:36:58,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:36:58,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:58,356 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:58,418 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:58,509 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:58,593 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:58,593 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-09-21 12:36:58,593 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-09-21 12:36:58,593 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 243 [2020-09-21 12:36:58,594 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:58,594 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-21 12:36:58,594 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:36:58,594 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-21 12:36:58,594 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:36:58,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:36:58,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:58,642 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:58,643 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:58,644 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:36:58,644 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:36:58,644 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 12:36:58,644 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:58,645 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:36:58,645 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:36:58,645 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:36:58,645 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:36:58,647 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 12:36:58,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107503635] [2020-09-21 12:36:58,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:36:58,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-09-21 12:36:58,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564771366] [2020-09-21 12:36:58,649 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 12:36:58,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:36:58,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 12:36:58,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-09-21 12:36:58,650 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-09-21 12:36:58,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:36:58,682 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2020-09-21 12:36:58,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 12:36:58,683 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-09-21 12:36:58,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:36:58,684 INFO L225 Difference]: With dead ends: 27 [2020-09-21 12:36:58,684 INFO L226 Difference]: Without dead ends: 19 [2020-09-21 12:36:58,685 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 [2020-09-21 12:36:58,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-09-21 12:36:58,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2020-09-21 12:36:58,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-09-21 12:36:58,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-09-21 12:36:58,690 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2020-09-21 12:36:58,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:36:58,690 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-09-21 12:36:58,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 12:36:58,691 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-09-21 12:36:58,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-21 12:36:58,691 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:36:58,691 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:36:58,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 12:36:58,692 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:36:58,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:36:58,692 INFO L82 PathProgramCache]: Analyzing trace with hash 199799702, now seen corresponding path program 2 times [2020-09-21 12:36:58,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:36:58,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [628999642] [2020-09-21 12:36:58,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:36:58,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:58,711 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:58,753 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:58,789 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:58,858 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:58,858 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-09-21 12:36:58,858 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-09-21 12:36:58,858 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 154 [2020-09-21 12:36:58,859 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:58,859 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-21 12:36:58,859 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:36:58,859 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-09-21 12:36:58,859 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:36:59,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:36:59,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:59,007 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:59,008 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:59,008 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:36:59,008 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:36:59,008 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 12:36:59,009 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:59,009 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:36:59,009 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:36:59,009 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:36:59,009 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:36:59,012 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 12:36:59,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [628999642] [2020-09-21 12:36:59,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:36:59,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 12:36:59,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014648308] [2020-09-21 12:36:59,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 12:36:59,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:36:59,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 12:36:59,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 12:36:59,014 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 5 states. [2020-09-21 12:36:59,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:36:59,062 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-09-21 12:36:59,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 12:36:59,063 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-09-21 12:36:59,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:36:59,064 INFO L225 Difference]: With dead ends: 27 [2020-09-21 12:36:59,064 INFO L226 Difference]: Without dead ends: 22 [2020-09-21 12:36:59,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 12:36:59,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-09-21 12:36:59,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2020-09-21 12:36:59,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-09-21 12:36:59,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-09-21 12:36:59,070 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2020-09-21 12:36:59,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:36:59,070 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-09-21 12:36:59,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 12:36:59,071 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-09-21 12:36:59,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-21 12:36:59,072 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:36:59,072 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:36:59,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 12:36:59,072 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:36:59,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:36:59,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1075985333, now seen corresponding path program 2 times [2020-09-21 12:36:59,073 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:36:59,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1753200214] [2020-09-21 12:36:59,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:36:59,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:59,091 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:59,117 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:59,240 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:59,328 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:59,711 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:59,711 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-09-21 12:36:59,711 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-09-21 12:36:59,711 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 627 [2020-09-21 12:36:59,712 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:59,712 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-21 12:36:59,712 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:36:59,712 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-09-21 12:36:59,713 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:36:59,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:36:59,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:59,792 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:59,793 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:36:59,794 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:36:59,794 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:36:59,794 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 12:36:59,794 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:36:59,795 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:36:59,795 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:36:59,795 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:36:59,795 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:36:59,797 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 12:36:59,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1753200214] [2020-09-21 12:36:59,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:36:59,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 12:36:59,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760855429] [2020-09-21 12:36:59,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 12:36:59,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:36:59,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 12:36:59,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 12:36:59,800 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 5 states. [2020-09-21 12:36:59,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:36:59,840 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-09-21 12:36:59,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 12:36:59,841 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-09-21 12:36:59,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:36:59,842 INFO L225 Difference]: With dead ends: 30 [2020-09-21 12:36:59,842 INFO L226 Difference]: Without dead ends: 22 [2020-09-21 12:36:59,842 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 [2020-09-21 12:36:59,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-09-21 12:36:59,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-09-21 12:36:59,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-21 12:36:59,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-09-21 12:36:59,848 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-09-21 12:36:59,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:36:59,848 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-09-21 12:36:59,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 12:36:59,848 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-09-21 12:36:59,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-21 12:36:59,849 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:36:59,849 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:36:59,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 12:36:59,850 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:36:59,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:36:59,850 INFO L82 PathProgramCache]: Analyzing trace with hash -1443974601, now seen corresponding path program 3 times [2020-09-21 12:36:59,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:36:59,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1830916518] [2020-09-21 12:36:59,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:36:59,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:36:59,867 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:59,894 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:59,921 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:36:59,946 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:00,529 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:00,530 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-09-21 12:37:00,530 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 4 [2020-09-21 12:37:00,530 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 669 [2020-09-21 12:37:00,530 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:00,531 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-21 12:37:00,531 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:37:00,531 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-09-21 12:37:00,531 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:00,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:37:00,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:00,656 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:00,658 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:00,658 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:37:00,659 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:37:00,659 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 12:37:00,659 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:00,659 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:37:00,659 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:37:00,660 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:37:00,660 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:00,662 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-09-21 12:37:00,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1830916518] [2020-09-21 12:37:00,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:37:00,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 12:37:00,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426011257] [2020-09-21 12:37:00,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 12:37:00,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:37:00,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 12:37:00,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 12:37:00,665 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-09-21 12:37:00,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:37:00,790 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-09-21 12:37:00,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 12:37:00,790 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-09-21 12:37:00,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:37:00,791 INFO L225 Difference]: With dead ends: 30 [2020-09-21 12:37:00,791 INFO L226 Difference]: Without dead ends: 25 [2020-09-21 12:37:00,792 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-09-21 12:37:00,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-09-21 12:37:00,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2020-09-21 12:37:00,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-09-21 12:37:00,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-09-21 12:37:00,798 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2020-09-21 12:37:00,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:37:00,798 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-09-21 12:37:00,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 12:37:00,798 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-09-21 12:37:00,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 12:37:00,799 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:37:00,799 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:37:00,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 12:37:00,800 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:37:00,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:37:00,800 INFO L82 PathProgramCache]: Analyzing trace with hash -1682133644, now seen corresponding path program 3 times [2020-09-21 12:37:00,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:37:00,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38010422] [2020-09-21 12:37:00,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:37:00,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:00,818 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:00,845 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:00,968 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:00,993 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:01,121 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:01,813 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:01,814 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 31 [2020-09-21 12:37:01,814 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-09-21 12:37:01,814 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1002 [2020-09-21 12:37:01,814 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:01,815 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-09-21 12:37:01,815 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:37:01,815 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 14 [2020-09-21 12:37:01,815 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:01,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:37:01,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:01,926 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:01,927 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:01,927 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:37:01,927 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:37:01,928 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 12:37:01,928 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:01,928 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:37:01,928 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:37:01,928 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:37:01,929 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:01,932 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-09-21 12:37:01,936 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38010422] [2020-09-21 12:37:01,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:37:01,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 12:37:01,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831111646] [2020-09-21 12:37:01,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 12:37:01,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:37:01,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 12:37:01,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 12:37:01,939 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-09-21 12:37:02,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:37:02,098 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-09-21 12:37:02,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 12:37:02,101 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-09-21 12:37:02,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:37:02,102 INFO L225 Difference]: With dead ends: 34 [2020-09-21 12:37:02,102 INFO L226 Difference]: Without dead ends: 29 [2020-09-21 12:37:02,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2020-09-21 12:37:02,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-09-21 12:37:02,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-09-21 12:37:02,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-09-21 12:37:02,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-09-21 12:37:02,113 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 22 [2020-09-21 12:37:02,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:37:02,114 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-09-21 12:37:02,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 12:37:02,114 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-09-21 12:37:02,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-09-21 12:37:02,115 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:37:02,115 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:37:02,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 12:37:02,115 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:37:02,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:37:02,116 INFO L82 PathProgramCache]: Analyzing trace with hash -1392210665, now seen corresponding path program 4 times [2020-09-21 12:37:02,116 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:37:02,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [839260686] [2020-09-21 12:37:02,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:37:02,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:02,144 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:02,173 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:02,298 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:02,441 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:02,604 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:03,023 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:03,139 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:03,139 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 34 [2020-09-21 12:37:03,139 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 6 [2020-09-21 12:37:03,139 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1004 [2020-09-21 12:37:03,140 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:03,140 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-09-21 12:37:03,140 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:37:03,140 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-09-21 12:37:03,140 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:03,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:37:03,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:03,223 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:03,224 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:03,224 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:37:03,225 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:37:03,225 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 12:37:03,225 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:03,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:37:03,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:37:03,226 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:37:03,226 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:03,229 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 18 proven. 15 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-21 12:37:03,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [839260686] [2020-09-21 12:37:03,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:37:03,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 12:37:03,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492926111] [2020-09-21 12:37:03,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 12:37:03,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:37:03,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 12:37:03,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 12:37:03,233 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 6 states. [2020-09-21 12:37:03,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:37:03,309 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2020-09-21 12:37:03,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 12:37:03,311 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-09-21 12:37:03,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:37:03,312 INFO L225 Difference]: With dead ends: 43 [2020-09-21 12:37:03,312 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 12:37:03,313 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 [2020-09-21 12:37:03,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 12:37:03,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-09-21 12:37:03,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-09-21 12:37:03,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-09-21 12:37:03,326 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2020-09-21 12:37:03,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:37:03,327 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-09-21 12:37:03,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 12:37:03,327 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-09-21 12:37:03,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 12:37:03,328 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:37:03,328 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:37:03,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 12:37:03,328 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:37:03,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:37:03,331 INFO L82 PathProgramCache]: Analyzing trace with hash -2062781546, now seen corresponding path program 5 times [2020-09-21 12:37:03,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:37:03,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1477358462] [2020-09-21 12:37:03,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:37:03,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:03,351 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:03,395 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:03,505 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:03,576 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:03,711 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:03,795 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:04,354 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:04,354 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 37 [2020-09-21 12:37:04,355 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 6 [2020-09-21 12:37:04,355 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1011 [2020-09-21 12:37:04,355 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:04,356 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-09-21 12:37:04,356 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:37:04,356 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-09-21 12:37:04,356 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 12:37:04,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:37:04,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:04,457 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:04,458 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:04,459 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:37:04,459 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:37:04,459 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 12:37:04,459 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:04,459 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:37:04,460 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:37:04,460 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:37:04,460 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:04,463 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-21 12:37:04,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1477358462] [2020-09-21 12:37:04,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:37:04,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 12:37:04,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523007910] [2020-09-21 12:37:04,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 12:37:04,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:37:04,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 12:37:04,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-21 12:37:04,466 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 7 states. [2020-09-21 12:37:04,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:37:04,544 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-09-21 12:37:04,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 12:37:04,545 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 28 [2020-09-21 12:37:04,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:37:04,546 INFO L225 Difference]: With dead ends: 46 [2020-09-21 12:37:04,546 INFO L226 Difference]: Without dead ends: 33 [2020-09-21 12:37:04,546 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 [2020-09-21 12:37:04,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-21 12:37:04,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-09-21 12:37:04,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-21 12:37:04,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-09-21 12:37:04,552 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 28 [2020-09-21 12:37:04,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:37:04,553 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-09-21 12:37:04,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 12:37:04,553 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-09-21 12:37:04,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-21 12:37:04,554 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:37:04,554 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:37:04,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 12:37:04,555 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:37:04,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:37:04,555 INFO L82 PathProgramCache]: Analyzing trace with hash 1147963575, now seen corresponding path program 6 times [2020-09-21 12:37:04,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:37:04,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831284419] [2020-09-21 12:37:04,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:37:04,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:04,572 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:04,611 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:04,793 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:05,144 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:05,213 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:05,450 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:05,518 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:05,557 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:05,585 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:05,585 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-09-21 12:37:05,585 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-09-21 12:37:05,586 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1020 [2020-09-21 12:37:05,586 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:05,586 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-09-21 12:37:05,586 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:37:05,586 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 23 [2020-09-21 12:37:05,587 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:05,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:37:05,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:05,720 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:05,721 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:05,722 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:37:05,722 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:37:05,722 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 12:37:05,722 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:05,723 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:37:05,723 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:37:05,723 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:37:05,723 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:05,733 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-09-21 12:37:05,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831284419] [2020-09-21 12:37:05,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:37:05,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 12:37:05,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053298698] [2020-09-21 12:37:05,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 12:37:05,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:37:05,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 12:37:05,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-09-21 12:37:05,736 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 7 states. [2020-09-21 12:37:06,119 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 26 [2020-09-21 12:37:06,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:37:06,264 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-09-21 12:37:06,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 12:37:06,267 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 31 [2020-09-21 12:37:06,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:37:06,271 INFO L225 Difference]: With dead ends: 46 [2020-09-21 12:37:06,271 INFO L226 Difference]: Without dead ends: 41 [2020-09-21 12:37:06,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=115, Unknown=0, NotChecked=0, Total=182 [2020-09-21 12:37:06,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-09-21 12:37:06,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 35. [2020-09-21 12:37:06,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-21 12:37:06,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2020-09-21 12:37:06,286 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 31 [2020-09-21 12:37:06,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:37:06,286 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2020-09-21 12:37:06,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 12:37:06,286 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2020-09-21 12:37:06,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-21 12:37:06,287 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:37:06,287 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:37:06,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-21 12:37:06,288 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:37:06,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:37:06,289 INFO L82 PathProgramCache]: Analyzing trace with hash -173979916, now seen corresponding path program 7 times [2020-09-21 12:37:06,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:37:06,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [987230290] [2020-09-21 12:37:06,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:37:06,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:06,308 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:06,372 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:06,504 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:06,579 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:06,965 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:06,994 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:07,274 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:07,314 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:07,314 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 43 [2020-09-21 12:37:07,314 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 7 [2020-09-21 12:37:07,314 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1013 [2020-09-21 12:37:07,315 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:07,315 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-09-21 12:37:07,315 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:37:07,315 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 26 [2020-09-21 12:37:07,315 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:07,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:37:07,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:07,541 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:07,542 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:07,542 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:37:07,543 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:37:07,544 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 12:37:07,544 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:07,545 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:37:07,545 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:37:07,545 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:37:07,545 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:07,554 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-09-21 12:37:07,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [987230290] [2020-09-21 12:37:07,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:37:07,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 12:37:07,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530161399] [2020-09-21 12:37:07,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 12:37:07,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:37:07,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 12:37:07,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-21 12:37:07,558 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 8 states. [2020-09-21 12:37:07,960 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-09-21 12:37:10,601 WARN L193 SmtUtils]: Spent 2.53 s on a formula simplification. DAG size of input: 39 DAG size of output: 23 [2020-09-21 12:37:19,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:37:19,388 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2020-09-21 12:37:19,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-21 12:37:19,389 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 34 [2020-09-21 12:37:19,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:37:19,392 INFO L225 Difference]: With dead ends: 53 [2020-09-21 12:37:19,392 INFO L226 Difference]: Without dead ends: 48 [2020-09-21 12:37:19,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=105, Invalid=198, Unknown=3, NotChecked=0, Total=306 [2020-09-21 12:37:19,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-21 12:37:19,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 38. [2020-09-21 12:37:19,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-09-21 12:37:19,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-09-21 12:37:19,403 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 34 [2020-09-21 12:37:19,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:37:19,405 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-09-21 12:37:19,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 12:37:19,405 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-09-21 12:37:19,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-09-21 12:37:19,406 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:37:19,406 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:37:19,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-21 12:37:19,407 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:37:19,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:37:19,407 INFO L82 PathProgramCache]: Analyzing trace with hash -1637383273, now seen corresponding path program 8 times [2020-09-21 12:37:19,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:37:19,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [653071130] [2020-09-21 12:37:19,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:37:19,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:19,431 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:19,483 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:19,564 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:19,721 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:20,270 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:20,306 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:20,412 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:20,442 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:20,443 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 46 [2020-09-21 12:37:20,443 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 7 [2020-09-21 12:37:20,443 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1019 [2020-09-21 12:37:20,443 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:20,443 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-09-21 12:37:20,444 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:37:20,444 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 18 [2020-09-21 12:37:20,444 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:20,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:37:20,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:20,555 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:20,556 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:20,557 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:37:20,557 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:37:20,557 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 12:37:20,557 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:20,558 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:37:20,558 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:37:20,558 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:37:20,558 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:20,563 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 62 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-09-21 12:37:20,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [653071130] [2020-09-21 12:37:20,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:37:20,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 12:37:20,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915627826] [2020-09-21 12:37:20,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 12:37:20,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:37:20,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 12:37:20,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-09-21 12:37:20,565 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 8 states. [2020-09-21 12:37:20,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:37:20,672 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2020-09-21 12:37:20,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 12:37:20,674 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 37 [2020-09-21 12:37:20,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:37:20,675 INFO L225 Difference]: With dead ends: 61 [2020-09-21 12:37:20,675 INFO L226 Difference]: Without dead ends: 42 [2020-09-21 12:37:20,675 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 [2020-09-21 12:37:20,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-09-21 12:37:20,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-09-21 12:37:20,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 12:37:20,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-09-21 12:37:20,689 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 37 [2020-09-21 12:37:20,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:37:20,690 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-09-21 12:37:20,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 12:37:20,690 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-09-21 12:37:20,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-21 12:37:20,691 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:37:20,693 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:37:20,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-21 12:37:20,693 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:37:20,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:37:20,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1362713706, now seen corresponding path program 9 times [2020-09-21 12:37:20,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:37:20,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022033722] [2020-09-21 12:37:20,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:37:20,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:20,712 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:20,761 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:20,921 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:20,974 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:21,324 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:21,436 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:21,705 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:21,706 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 49 [2020-09-21 12:37:21,706 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 6 [2020-09-21 12:37:21,706 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1000 [2020-09-21 12:37:21,706 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:21,706 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-09-21 12:37:21,707 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:37:21,707 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 32 [2020-09-21 12:37:21,707 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:21,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:37:21,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:21,985 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:21,985 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:21,986 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:37:21,986 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:37:21,986 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 12:37:21,986 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:21,986 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:37:21,987 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:37:21,987 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:37:21,987 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:21,995 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-09-21 12:37:21,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022033722] [2020-09-21 12:37:21,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:37:21,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 12:37:21,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654289018] [2020-09-21 12:37:21,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 12:37:21,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:37:21,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 12:37:21,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-09-21 12:37:21,997 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 9 states. [2020-09-21 12:37:24,614 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification. DAG size of input: 43 DAG size of output: 32 [2020-09-21 12:37:24,901 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 32 [2020-09-21 12:37:25,220 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 28 [2020-09-21 12:37:27,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:37:27,940 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2020-09-21 12:37:27,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-21 12:37:27,941 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 40 [2020-09-21 12:37:27,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:37:27,942 INFO L225 Difference]: With dead ends: 61 [2020-09-21 12:37:27,942 INFO L226 Difference]: Without dead ends: 56 [2020-09-21 12:37:27,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=149, Invalid=312, Unknown=1, NotChecked=0, Total=462 [2020-09-21 12:37:27,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-09-21 12:37:27,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 44. [2020-09-21 12:37:27,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-09-21 12:37:27,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2020-09-21 12:37:27,952 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 40 [2020-09-21 12:37:27,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:37:27,953 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2020-09-21 12:37:27,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 12:37:27,953 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2020-09-21 12:37:27,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-09-21 12:37:27,954 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:37:27,954 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:37:27,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-21 12:37:27,954 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:37:27,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:37:27,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1094601653, now seen corresponding path program 10 times [2020-09-21 12:37:27,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:37:27,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373143698] [2020-09-21 12:37:27,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:37:27,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:27,973 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:28,014 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:28,100 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:28,134 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:28,297 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:28,352 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:28,385 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:28,412 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:28,443 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:28,966 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:28,966 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 52 [2020-09-21 12:37:28,966 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 9 [2020-09-21 12:37:28,966 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1000 [2020-09-21 12:37:28,967 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:28,967 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-09-21 12:37:28,967 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:37:28,967 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-09-21 12:37:28,967 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:29,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:37:29,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:29,084 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:29,085 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:29,085 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:37:29,085 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:37:29,085 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 12:37:29,086 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:29,086 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:37:29,086 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:37:29,086 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:37:29,086 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:29,091 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 93 proven. 57 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-09-21 12:37:29,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373143698] [2020-09-21 12:37:29,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:37:29,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 12:37:29,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079074173] [2020-09-21 12:37:29,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 12:37:29,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:37:29,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 12:37:29,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-09-21 12:37:29,095 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand 9 states. [2020-09-21 12:37:29,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:37:29,223 INFO L93 Difference]: Finished difference Result 70 states and 81 transitions. [2020-09-21 12:37:29,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 12:37:29,224 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 43 [2020-09-21 12:37:29,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:37:29,225 INFO L225 Difference]: With dead ends: 70 [2020-09-21 12:37:29,225 INFO L226 Difference]: Without dead ends: 48 [2020-09-21 12:37:29,226 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 [2020-09-21 12:37:29,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-21 12:37:29,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-09-21 12:37:29,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-09-21 12:37:29,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2020-09-21 12:37:29,238 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 43 [2020-09-21 12:37:29,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:37:29,239 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2020-09-21 12:37:29,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 12:37:29,239 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2020-09-21 12:37:29,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-09-21 12:37:29,242 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:37:29,242 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:37:29,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-21 12:37:29,243 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:37:29,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:37:29,243 INFO L82 PathProgramCache]: Analyzing trace with hash -522243980, now seen corresponding path program 11 times [2020-09-21 12:37:29,243 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:37:29,243 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [501821903] [2020-09-21 12:37:29,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:37:29,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:29,274 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:29,331 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:29,438 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:29,574 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:29,975 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:30,108 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:30,222 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:30,262 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:30,262 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 55 [2020-09-21 12:37:30,262 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 7 [2020-09-21 12:37:30,263 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1001 [2020-09-21 12:37:30,263 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:30,263 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-09-21 12:37:30,263 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:37:30,263 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 38 [2020-09-21 12:37:30,264 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:49,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:37:49,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:49,096 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:49,097 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:49,097 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:37:49,097 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:37:49,097 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 12:37:49,097 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:49,097 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:37:49,097 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:37:49,098 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:37:49,098 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:49,106 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 135 refuted. 18 times theorem prover too weak. 57 trivial. 0 not checked. [2020-09-21 12:37:49,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [501821903] [2020-09-21 12:37:49,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:37:49,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 12:37:49,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495825652] [2020-09-21 12:37:49,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 12:37:49,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:37:49,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 12:37:49,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=58, Unknown=9, NotChecked=0, Total=90 [2020-09-21 12:37:49,108 INFO L87 Difference]: Start difference. First operand 47 states and 52 transitions. Second operand 10 states. [2020-09-21 12:37:52,186 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 30 [2020-09-21 12:37:52,347 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 26 [2020-09-21 12:37:54,616 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification. DAG size of input: 60 DAG size of output: 30 [2020-09-21 12:37:55,016 WARN L193 SmtUtils]: Spent 323.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 26 [2020-09-21 12:37:58,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 12:37:58,555 INFO L93 Difference]: Finished difference Result 70 states and 81 transitions. [2020-09-21 12:37:58,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-09-21 12:37:58,562 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 46 [2020-09-21 12:37:58,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 12:37:58,563 INFO L225 Difference]: With dead ends: 70 [2020-09-21 12:37:58,563 INFO L226 Difference]: Without dead ends: 65 [2020-09-21 12:37:58,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 27.4s TimeCoverageRelationStatistics Valid=202, Invalid=437, Unknown=11, NotChecked=0, Total=650 [2020-09-21 12:37:58,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-09-21 12:37:58,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 50. [2020-09-21 12:37:58,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-21 12:37:58,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 56 transitions. [2020-09-21 12:37:58,583 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 56 transitions. Word has length 46 [2020-09-21 12:37:58,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 12:37:58,585 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 56 transitions. [2020-09-21 12:37:58,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-21 12:37:58,585 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 56 transitions. [2020-09-21 12:37:58,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-09-21 12:37:58,586 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 12:37:58,586 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 12:37:58,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-21 12:37:58,586 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 12:37:58,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 12:37:58,587 INFO L82 PathProgramCache]: Analyzing trace with hash -131126761, now seen corresponding path program 12 times [2020-09-21 12:37:58,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 12:37:58,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354246579] [2020-09-21 12:37:58,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 12:37:58,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:58,615 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:58,700 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:58,908 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:58,951 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:59,122 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:59,241 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:59,338 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:59,601 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:59,602 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 58 [2020-09-21 12:37:59,602 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 7 [2020-09-21 12:37:59,602 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1000 [2020-09-21 12:37:59,602 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:59,602 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 9 [2020-09-21 12:37:59,603 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-09-21 12:37:59,603 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 24 [2020-09-21 12:37:59,603 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:59,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 12:37:59,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 12:37:59,755 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-21 12:37:59,755 FATAL L256 erpolLogProxyWrapper]: Timeout: 1000 [2020-09-21 12:37:59,756 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 12:37:59,756 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 12:37:59,756 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-21 12:37:59,756 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLEST [2020-09-21 12:37:59,756 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 12:37:59,757 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 12:37:59,757 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 12:37:59,757 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 12:37:59,762 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 130 proven. 77 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-09-21 12:37:59,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354246579] [2020-09-21 12:37:59,762 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 12:37:59,763 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-21 12:37:59,763 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823553020] [2020-09-21 12:37:59,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-21 12:37:59,763 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 12:37:59,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-21 12:37:59,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-09-21 12:37:59,764 INFO L87 Difference]: Start difference. First operand 50 states and 56 transitions. Second operand 10 states.