/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=1.0 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 02:21:57,835 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 02:21:57,837 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 02:21:57,861 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 02:21:57,861 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 02:21:57,863 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 02:21:57,864 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 02:21:57,866 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 02:21:57,867 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 02:21:57,868 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 02:21:57,869 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 02:21:57,870 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 02:21:57,870 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 02:21:57,871 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 02:21:57,872 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 02:21:57,873 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 02:21:57,874 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 02:21:57,875 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 02:21:57,877 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 02:21:57,879 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 02:21:57,880 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 02:21:57,881 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 02:21:57,882 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 02:21:57,883 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 02:21:57,886 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 02:21:57,886 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 02:21:57,886 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 02:21:57,887 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 02:21:57,887 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 02:21:57,888 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 02:21:57,889 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 02:21:57,889 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 02:21:57,890 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 02:21:57,891 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 02:21:57,892 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 02:21:57,892 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 02:21:57,893 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 02:21:57,893 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 02:21:57,893 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 02:21:57,894 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 02:21:57,895 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 02:21:57,895 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 02:21:57,938 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 02:21:57,938 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 02:21:57,940 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 02:21:57,943 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 02:21:57,943 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 02:21:57,943 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 02:21:57,944 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 02:21:57,944 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 02:21:57,944 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 02:21:57,944 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 02:21:57,944 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 02:21:57,944 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 02:21:57,945 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 02:21:57,945 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 02:21:57,945 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 02:21:57,945 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 02:21:57,945 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 02:21:57,946 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 02:21:57,949 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 02:21:57,949 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 02:21:57,949 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 02:21:57,949 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 02:21:57,950 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 02:21:57,950 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 02:21:57,950 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 02:21:57,950 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 02:21:57,950 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 02:21:57,951 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 02:21:57,951 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 02:21:57,951 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=1.0;log-additional-information=true; [2020-08-22 02:21:58,238 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 02:21:58,250 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 02:21:58,253 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 02:21:58,255 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 02:21:58,255 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 02:21:58,256 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-22 02:21:58,321 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d2983217d/e30cca9ba4ba4dad88360b87341d61e9/FLAG8307a348c [2020-08-22 02:21:58,721 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 02:21:58,721 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-22 02:21:58,728 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d2983217d/e30cca9ba4ba4dad88360b87341d61e9/FLAG8307a348c [2020-08-22 02:21:59,090 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d2983217d/e30cca9ba4ba4dad88360b87341d61e9 [2020-08-22 02:21:59,101 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 02:21:59,103 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 02:21:59,104 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 02:21:59,104 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 02:21:59,108 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 02:21:59,109 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 02:21:59" (1/1) ... [2020-08-22 02:21:59,112 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e2018f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:21:59, skipping insertion in model container [2020-08-22 02:21:59,112 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 02:21:59" (1/1) ... [2020-08-22 02:21:59,121 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 02:21:59,139 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 02:21:59,342 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 02:21:59,347 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 02:21:59,370 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 02:21:59,388 INFO L208 MainTranslator]: Completed translation [2020-08-22 02:21:59,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:21:59 WrapperNode [2020-08-22 02:21:59,389 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 02:21:59,390 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 02:21:59,390 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 02:21:59,390 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 02:21:59,408 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:21:59" (1/1) ... [2020-08-22 02:21:59,408 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:21:59" (1/1) ... [2020-08-22 02:21:59,414 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:21:59" (1/1) ... [2020-08-22 02:21:59,414 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:21:59" (1/1) ... [2020-08-22 02:21:59,496 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:21:59" (1/1) ... [2020-08-22 02:21:59,501 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:21:59" (1/1) ... [2020-08-22 02:21:59,502 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:21:59" (1/1) ... [2020-08-22 02:21:59,504 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 02:21:59,505 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 02:21:59,505 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 02:21:59,505 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 02:21:59,506 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:21:59" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 02:21:59,582 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 02:21:59,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 02:21:59,583 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 02:21:59,583 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 02:21:59,584 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 02:21:59,584 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 02:21:59,585 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 02:21:59,585 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 02:21:59,585 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 02:21:59,586 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 02:21:59,586 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 02:21:59,586 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 02:21:59,586 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 02:21:59,919 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 02:21:59,919 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 02:21:59,924 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 02:21:59 BoogieIcfgContainer [2020-08-22 02:21:59,924 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 02:21:59,925 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 02:21:59,925 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 02:21:59,929 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 02:21:59,929 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 02:21:59" (1/3) ... [2020-08-22 02:21:59,930 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2eb5ce16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 02:21:59, skipping insertion in model container [2020-08-22 02:21:59,930 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 02:21:59" (2/3) ... [2020-08-22 02:21:59,930 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2eb5ce16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 02:21:59, skipping insertion in model container [2020-08-22 02:21:59,931 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 02:21:59" (3/3) ... [2020-08-22 02:21:59,932 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-22 02:21:59,943 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 02:21:59,950 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 02:21:59,964 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 02:21:59,988 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 02:21:59,988 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 02:21:59,988 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 02:21:59,988 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 02:21:59,988 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 02:21:59,989 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 02:21:59,989 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 02:21:59,989 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 02:22:00,007 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-22 02:22:00,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 02:22:00,013 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:00,014 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:00,015 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:00,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:00,021 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-22 02:22:00,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:00,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1476702158] [2020-08-22 02:22:00,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:00,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:00,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:00,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:00,162 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:00,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1476702158] [2020-08-22 02:22:00,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 02:22:00,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 02:22:00,166 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217694849] [2020-08-22 02:22:00,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 02:22:00,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:00,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 02:22:00,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 02:22:00,200 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-22 02:22:00,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:00,227 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-22 02:22:00,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 02:22:00,229 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-22 02:22:00,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:00,239 INFO L225 Difference]: With dead ends: 35 [2020-08-22 02:22:00,239 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 02:22:00,243 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 [2020-08-22 02:22:00,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 02:22:00,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 02:22:00,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 02:22:00,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-22 02:22:00,286 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-22 02:22:00,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:00,286 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-22 02:22:00,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 02:22:00,286 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-22 02:22:00,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 02:22:00,287 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:00,287 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:00,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 02:22:00,288 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:00,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:00,288 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-22 02:22:00,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:00,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [441326281] [2020-08-22 02:22:00,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:00,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:00,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:00,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:00,340 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:00,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [441326281] [2020-08-22 02:22:00,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 02:22:00,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 02:22:00,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70396118] [2020-08-22 02:22:00,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 02:22:00,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:00,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 02:22:00,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 02:22:00,345 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-22 02:22:00,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:00,364 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-22 02:22:00,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 02:22:00,365 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-22 02:22:00,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:00,366 INFO L225 Difference]: With dead ends: 24 [2020-08-22 02:22:00,366 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 02:22:00,367 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 [2020-08-22 02:22:00,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 02:22:00,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 02:22:00,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 02:22:00,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-22 02:22:00,371 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-22 02:22:00,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:00,372 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-22 02:22:00,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 02:22:00,372 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-22 02:22:00,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 02:22:00,373 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:00,373 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:00,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 02:22:00,374 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:00,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:00,374 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-22 02:22:00,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:00,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [990344326] [2020-08-22 02:22:00,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:00,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:00,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:00,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:00,615 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:00,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [990344326] [2020-08-22 02:22:00,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 02:22:00,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 02:22:00,616 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384597076] [2020-08-22 02:22:00,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 02:22:00,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:00,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 02:22:00,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 02:22:00,618 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-22 02:22:00,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:00,655 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-22 02:22:00,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 02:22:00,656 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-22 02:22:00,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:00,657 INFO L225 Difference]: With dead ends: 23 [2020-08-22 02:22:00,657 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 02:22:00,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 02:22:00,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 02:22:00,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 02:22:00,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 02:22:00,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-22 02:22:00,663 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-22 02:22:00,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:00,663 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-22 02:22:00,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 02:22:00,663 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-22 02:22:00,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 02:22:00,664 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:00,664 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:00,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 02:22:00,665 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:00,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:00,666 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-22 02:22:00,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:00,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94163126] [2020-08-22 02:22:00,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:00,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:00,859 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-22 02:22:00,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:00,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:00,867 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:00,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94163126] [2020-08-22 02:22:00,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 02:22:00,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 02:22:00,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094736885] [2020-08-22 02:22:00,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 02:22:00,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:00,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 02:22:00,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 02:22:00,876 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-22 02:22:00,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:00,918 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-22 02:22:00,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 02:22:00,921 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-22 02:22:00,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:00,922 INFO L225 Difference]: With dead ends: 26 [2020-08-22 02:22:00,922 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 02:22:00,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 02:22:00,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 02:22:00,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 02:22:00,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 02:22:00,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 02:22:00,932 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-22 02:22:00,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:00,933 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 02:22:00,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 02:22:00,933 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 02:22:00,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 02:22:00,935 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:00,936 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:00,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 02:22:00,936 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:00,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:00,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-22 02:22:00,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:00,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [918474264] [2020-08-22 02:22:00,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:00,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:01,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:01,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:01,213 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:01,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [918474264] [2020-08-22 02:22:01,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 02:22:01,214 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 02:22:01,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416158001] [2020-08-22 02:22:01,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 02:22:01,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:01,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 02:22:01,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-22 02:22:01,216 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-22 02:22:01,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:01,332 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-22 02:22:01,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 02:22:01,333 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-22 02:22:01,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:01,334 INFO L225 Difference]: With dead ends: 26 [2020-08-22 02:22:01,334 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 02:22:01,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-22 02:22:01,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 02:22:01,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 02:22:01,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 02:22:01,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-22 02:22:01,340 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-22 02:22:01,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:01,340 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-22 02:22:01,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 02:22:01,341 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-22 02:22:01,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 02:22:01,341 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:01,342 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:01,342 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 02:22:01,342 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:01,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:01,343 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-22 02:22:01,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:01,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [275635527] [2020-08-22 02:22:01,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:01,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:01,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:01,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:01,601 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:01,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [275635527] [2020-08-22 02:22:01,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 02:22:01,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 02:22:01,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879484063] [2020-08-22 02:22:01,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 02:22:01,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:01,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 02:22:01,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-22 02:22:01,604 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-22 02:22:01,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:01,765 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-22 02:22:01,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 02:22:01,766 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-22 02:22:01,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:01,769 INFO L225 Difference]: With dead ends: 29 [2020-08-22 02:22:01,769 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 02:22:01,770 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-22 02:22:01,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 02:22:01,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-22 02:22:01,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 02:22:01,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-22 02:22:01,784 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-22 02:22:01,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:01,785 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-22 02:22:01,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 02:22:01,785 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-22 02:22:01,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 02:22:01,789 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:01,789 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:01,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 02:22:01,790 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:01,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:01,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-22 02:22:01,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:01,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1350891333] [2020-08-22 02:22:01,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:01,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:02,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:02,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:02,159 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:02,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1350891333] [2020-08-22 02:22:02,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 02:22:02,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 02:22:02,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155811297] [2020-08-22 02:22:02,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 02:22:02,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:02,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 02:22:02,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-22 02:22:02,164 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-22 02:22:06,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:06,567 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-22 02:22:06,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 02:22:06,567 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-22 02:22:06,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:06,569 INFO L225 Difference]: With dead ends: 32 [2020-08-22 02:22:06,570 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 02:22:06,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=33, Invalid=148, Unknown=1, NotChecked=0, Total=182 [2020-08-22 02:22:06,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 02:22:06,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 02:22:06,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 02:22:06,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-22 02:22:06,580 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-22 02:22:06,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:06,581 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-22 02:22:06,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 02:22:06,581 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-22 02:22:06,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 02:22:06,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:06,584 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:06,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 02:22:06,585 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:06,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:06,586 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-22 02:22:06,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:06,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1632649216] [2020-08-22 02:22:06,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:06,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:07,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:07,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:07,031 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:07,031 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1632649216] [2020-08-22 02:22:07,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 02:22:07,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 02:22:07,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854517483] [2020-08-22 02:22:07,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 02:22:07,033 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:07,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 02:22:07,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-22 02:22:07,034 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-22 02:22:07,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:07,296 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-22 02:22:07,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 02:22:07,296 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-22 02:22:07,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:07,297 INFO L225 Difference]: With dead ends: 35 [2020-08-22 02:22:07,297 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 02:22:07,298 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-22 02:22:07,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 02:22:07,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-22 02:22:07,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 02:22:07,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-22 02:22:07,303 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-22 02:22:07,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:07,303 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-22 02:22:07,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 02:22:07,303 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-22 02:22:07,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 02:22:07,304 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:07,304 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:07,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 02:22:07,305 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:07,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:07,305 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-22 02:22:07,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:07,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819390497] [2020-08-22 02:22:07,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:07,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:07,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:07,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:07,658 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:07,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819390497] [2020-08-22 02:22:07,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 02:22:07,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 02:22:07,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310941041] [2020-08-22 02:22:07,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 02:22:07,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:07,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 02:22:07,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-22 02:22:07,661 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-22 02:22:16,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:16,339 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-22 02:22:16,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 02:22:16,340 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-22 02:22:16,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:16,346 INFO L225 Difference]: With dead ends: 38 [2020-08-22 02:22:16,346 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 02:22:16,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=41, Invalid=264, Unknown=1, NotChecked=0, Total=306 [2020-08-22 02:22:16,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 02:22:16,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-22 02:22:16,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 02:22:16,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-22 02:22:16,358 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-22 02:22:16,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:16,358 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-22 02:22:16,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 02:22:16,359 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-22 02:22:16,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 02:22:16,362 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:16,362 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:16,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 02:22:16,362 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:16,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:16,365 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-22 02:22:16,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:16,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1642979212] [2020-08-22 02:22:16,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:16,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:16,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:16,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:16,920 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:16,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1642979212] [2020-08-22 02:22:16,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 02:22:16,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 02:22:16,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789297714] [2020-08-22 02:22:16,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 02:22:16,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:16,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 02:22:16,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-22 02:22:16,924 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-22 02:22:25,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:25,675 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-22 02:22:25,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 02:22:25,676 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-22 02:22:25,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:25,676 INFO L225 Difference]: With dead ends: 41 [2020-08-22 02:22:25,676 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 02:22:25,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-22 02:22:25,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 02:22:25,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-22 02:22:25,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 02:22:25,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-22 02:22:25,682 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-22 02:22:25,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:25,682 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-22 02:22:25,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 02:22:25,682 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-22 02:22:25,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 02:22:25,683 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:25,683 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:25,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 02:22:25,684 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:25,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:25,684 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-22 02:22:25,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:25,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [923022711] [2020-08-22 02:22:25,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:25,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:26,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:26,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:26,236 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:26,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [923022711] [2020-08-22 02:22:26,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 02:22:26,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 02:22:26,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707427826] [2020-08-22 02:22:26,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 02:22:26,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:26,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 02:22:26,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-22 02:22:26,241 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-22 02:22:30,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:30,864 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-22 02:22:30,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 02:22:30,865 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-22 02:22:30,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:30,866 INFO L225 Difference]: With dead ends: 44 [2020-08-22 02:22:30,866 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 02:22:30,867 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=49, Invalid=412, Unknown=1, NotChecked=0, Total=462 [2020-08-22 02:22:30,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 02:22:30,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-22 02:22:30,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 02:22:30,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-22 02:22:30,877 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-22 02:22:30,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:30,877 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-22 02:22:30,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 02:22:30,877 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-22 02:22:30,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 02:22:30,878 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:30,878 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:30,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 02:22:30,880 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:30,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:30,880 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-22 02:22:30,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:30,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1394956776] [2020-08-22 02:22:30,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:30,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:31,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:31,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:31,502 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:31,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1394956776] [2020-08-22 02:22:31,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 02:22:31,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 02:22:31,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734381618] [2020-08-22 02:22:31,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 02:22:31,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:31,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 02:22:31,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-22 02:22:31,505 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-22 02:22:32,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:32,002 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-22 02:22:32,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 02:22:32,002 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-22 02:22:32,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:32,004 INFO L225 Difference]: With dead ends: 47 [2020-08-22 02:22:32,004 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 02:22:32,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-22 02:22:32,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 02:22:32,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-22 02:22:32,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 02:22:32,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-22 02:22:32,010 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-22 02:22:32,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:32,010 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-22 02:22:32,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 02:22:32,010 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-22 02:22:32,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 02:22:32,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:32,012 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:32,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 02:22:32,012 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:32,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:32,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-22 02:22:32,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:32,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435935236] [2020-08-22 02:22:32,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:32,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:32,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:32,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:32,764 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:32,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435935236] [2020-08-22 02:22:32,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 02:22:32,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 02:22:32,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152194169] [2020-08-22 02:22:32,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 02:22:32,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:32,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 02:22:32,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-22 02:22:32,766 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-22 02:22:42,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:22:42,496 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-22 02:22:42,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 02:22:42,496 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-22 02:22:42,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:22:42,497 INFO L225 Difference]: With dead ends: 50 [2020-08-22 02:22:42,498 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 02:22:42,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=57, Invalid=591, Unknown=2, NotChecked=0, Total=650 [2020-08-22 02:22:42,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 02:22:42,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-22 02:22:42,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 02:22:42,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-22 02:22:42,503 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-22 02:22:42,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:22:42,503 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-22 02:22:42,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 02:22:42,504 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-22 02:22:42,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 02:22:42,505 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:22:42,505 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:22:42,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 02:22:42,506 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:22:42,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:22:42,506 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-22 02:22:42,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:22:42,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [328466205] [2020-08-22 02:22:42,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:22:42,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:43,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:22:43,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:22:43,334 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:22:43,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [328466205] [2020-08-22 02:22:43,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 02:22:43,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 02:22:43,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671633233] [2020-08-22 02:22:43,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 02:22:43,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:22:43,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 02:22:43,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-22 02:22:43,338 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-22 02:23:11,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 02:23:11,001 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-22 02:23:11,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 02:23:11,001 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-22 02:23:11,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 02:23:11,003 INFO L225 Difference]: With dead ends: 53 [2020-08-22 02:23:11,003 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 02:23:11,004 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=61, Invalid=690, Unknown=5, NotChecked=0, Total=756 [2020-08-22 02:23:11,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 02:23:11,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-22 02:23:11,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 02:23:11,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-22 02:23:11,009 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-22 02:23:11,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 02:23:11,010 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-22 02:23:11,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 02:23:11,010 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-22 02:23:11,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-22 02:23:11,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 02:23:11,011 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 02:23:11,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 02:23:11,011 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 02:23:11,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 02:23:11,012 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-22 02:23:11,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 02:23:11,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1398433198] [2020-08-22 02:23:11,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 02:23:11,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:23:11,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 02:23:11,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 02:23:12,007 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 02:23:12,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1398433198] [2020-08-22 02:23:12,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 02:23:12,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 02:23:12,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584487901] [2020-08-22 02:23:12,010 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 02:23:12,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 02:23:12,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 02:23:12,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-22 02:23:12,012 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states.