/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/in-de51.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:01:14,064 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:01:14,066 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:01:14,093 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:01:14,099 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:01:14,100 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:01:14,101 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:01:14,101 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:01:14,102 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:01:14,102 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:01:14,103 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:01:14,104 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:01:14,105 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:01:14,106 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:01:14,106 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:01:14,107 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:01:14,109 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:01:14,129 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:01:14,130 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:01:14,130 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:01:14,132 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:01:14,158 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:01:14,159 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:01:14,159 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:01:14,160 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:01:14,160 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:01:14,160 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:01:14,160 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:01:14,160 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:01:14,160 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:01:14,160 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:01:14,161 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:01:14,161 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:01:14,161 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:01:14,161 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:01:14,161 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:01:14,161 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:01:14,161 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:01:14,161 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:01:14,162 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:01:14,162 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:01:14,162 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:01:14,162 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:01:14,162 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:01:14,162 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:01:14,162 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:01:14,162 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:01:14,162 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:01:14,163 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:01:14,163 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:01:14,431 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:01:14,445 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:01:14,446 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:01:14,447 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:01:14,447 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:01:14,448 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de51.c [2021-05-02 13:01:14,486 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8ae9ebef6/ccbeb743c89a4da68024450aea558fb3/FLAGf8cdb9e1a [2021-05-02 13:01:14,781 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:01:14,782 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de51.c [2021-05-02 13:01:14,786 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8ae9ebef6/ccbeb743c89a4da68024450aea558fb3/FLAGf8cdb9e1a [2021-05-02 13:01:15,221 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8ae9ebef6/ccbeb743c89a4da68024450aea558fb3 [2021-05-02 13:01:15,223 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:01:15,246 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:01:15,247 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:01:15,247 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:01:15,249 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:01:15,250 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:01:15" (1/1) ... [2021-05-02 13:01:15,250 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3672f0c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:15, skipping insertion in model container [2021-05-02 13:01:15,250 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:01:15" (1/1) ... [2021-05-02 13:01:15,255 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:01:15,266 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:01:15,349 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de51.c[368,381] [2021-05-02 13:01:15,366 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:01:15,371 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:01:15,381 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de51.c[368,381] [2021-05-02 13:01:15,384 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:01:15,427 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:01:15,428 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:15 WrapperNode [2021-05-02 13:01:15,428 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:01:15,430 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:01:15,430 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:01:15,430 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:01:15,437 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:15" (1/1) ... [2021-05-02 13:01:15,437 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:15" (1/1) ... [2021-05-02 13:01:15,443 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:15" (1/1) ... [2021-05-02 13:01:15,443 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:15" (1/1) ... [2021-05-02 13:01:15,453 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:15" (1/1) ... [2021-05-02 13:01:15,456 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:15" (1/1) ... [2021-05-02 13:01:15,460 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:15" (1/1) ... [2021-05-02 13:01:15,463 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:01:15,464 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:01:15,464 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:01:15,464 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:01:15,465 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:15" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2021-05-02 13:01:15,526 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:01:15,527 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:01:15,527 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:01:15,527 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:01:15,527 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:01:15,527 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:01:15,527 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:01:15,528 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:01:15,528 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:01:15,528 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 13:01:15,528 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:01:15,528 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:01:15,529 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:01:15,529 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:01:15,530 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:01:15,530 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:01:15,530 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:01:15,530 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:01:15,723 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:01:15,723 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 13:01:15,724 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:01:15 BoogieIcfgContainer [2021-05-02 13:01:15,724 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:01:15,725 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:01:15,725 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:01:15,727 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:01:15,727 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:01:15" (1/3) ... [2021-05-02 13:01:15,728 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2734cc76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:01:15, skipping insertion in model container [2021-05-02 13:01:15,728 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:01:15" (2/3) ... [2021-05-02 13:01:15,728 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2734cc76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:01:15, skipping insertion in model container [2021-05-02 13:01:15,728 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:01:15" (3/3) ... [2021-05-02 13:01:15,729 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de51.c [2021-05-02 13:01:15,732 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:01:15,734 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:01:15,744 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:01:15,758 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:01:15,758 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:01:15,758 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:01:15,758 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:01:15,759 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:01:15,759 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:01:15,759 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:01:15,759 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:01:15,768 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:01:15,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 13:01:15,771 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:15,771 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:15,772 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:15,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:15,775 INFO L82 PathProgramCache]: Analyzing trace with hash -1060076674, now seen corresponding path program 1 times [2021-05-02 13:01:15,780 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:15,780 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112657443] [2021-05-02 13:01:15,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:15,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:15,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:15,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:15,982 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:15,982 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:15,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112657443] [2021-05-02 13:01:15,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112657443] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:01:15,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:01:15,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:01:15,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105328407] [2021-05-02 13:01:15,987 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:01:15,987 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:16,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:01:16,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:01:16,003 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:16,055 INFO L93 Difference]: Finished difference Result 41 states and 60 transitions. [2021-05-02 13:01:16,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:01:16,057 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 13:01:16,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:16,062 INFO L225 Difference]: With dead ends: 41 [2021-05-02 13:01:16,062 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 13:01:16,064 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:01:16,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 13:01:16,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 13:01:16,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-05-02 13:01:16,091 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 16 [2021-05-02 13:01:16,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:16,091 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-05-02 13:01:16,092 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,092 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-05-02 13:01:16,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 13:01:16,093 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:16,094 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:16,094 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:01:16,094 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:16,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:16,097 INFO L82 PathProgramCache]: Analyzing trace with hash -1174593278, now seen corresponding path program 1 times [2021-05-02 13:01:16,097 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:16,097 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590227323] [2021-05-02 13:01:16,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:16,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:16,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:16,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:16,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:16,269 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:16,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590227323] [2021-05-02 13:01:16,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1590227323] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:01:16,269 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:01:16,270 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:01:16,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058736115] [2021-05-02 13:01:16,271 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:01:16,271 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:16,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:01:16,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:01:16,276 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:16,384 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2021-05-02 13:01:16,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:01:16,385 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 13:01:16,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:16,385 INFO L225 Difference]: With dead ends: 28 [2021-05-02 13:01:16,385 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 13:01:16,393 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 84.3ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:01:16,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 13:01:16,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 13:01:16,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2021-05-02 13:01:16,398 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 16 [2021-05-02 13:01:16,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:16,398 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2021-05-02 13:01:16,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,398 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2021-05-02 13:01:16,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:01:16,398 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:16,399 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:16,399 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:01:16,399 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:16,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:16,399 INFO L82 PathProgramCache]: Analyzing trace with hash -2018158143, now seen corresponding path program 1 times [2021-05-02 13:01:16,399 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:16,399 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057312324] [2021-05-02 13:01:16,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:16,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:16,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:16,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:16,465 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:16,465 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:16,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057312324] [2021-05-02 13:01:16,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057312324] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:01:16,466 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:01:16,466 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:01:16,466 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816506567] [2021-05-02 13:01:16,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:01:16,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:16,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:01:16,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:01:16,467 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:16,532 INFO L93 Difference]: Finished difference Result 35 states and 48 transitions. [2021-05-02 13:01:16,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:01:16,533 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:01:16,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:16,534 INFO L225 Difference]: With dead ends: 35 [2021-05-02 13:01:16,534 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:01:16,534 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 36.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:01:16,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:01:16,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 13:01:16,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-05-02 13:01:16,543 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 17 [2021-05-02 13:01:16,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:16,543 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-05-02 13:01:16,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,543 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-05-02 13:01:16,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:01:16,544 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:16,544 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:16,544 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:01:16,544 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:16,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:16,544 INFO L82 PathProgramCache]: Analyzing trace with hash -615329744, now seen corresponding path program 1 times [2021-05-02 13:01:16,544 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:16,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063615137] [2021-05-02 13:01:16,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:16,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:16,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:16,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:16,613 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:16,613 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:16,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063615137] [2021-05-02 13:01:16,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063615137] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:01:16,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:01:16,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:01:16,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646353812] [2021-05-02 13:01:16,614 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:01:16,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:16,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:01:16,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:01:16,615 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:16,688 INFO L93 Difference]: Finished difference Result 44 states and 63 transitions. [2021-05-02 13:01:16,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:01:16,688 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:01:16,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:16,690 INFO L225 Difference]: With dead ends: 44 [2021-05-02 13:01:16,690 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 13:01:16,690 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:01:16,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 13:01:16,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2021-05-02 13:01:16,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4814814814814814) internal successors, (40), 27 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 44 transitions. [2021-05-02 13:01:16,694 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 44 transitions. Word has length 17 [2021-05-02 13:01:16,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:16,695 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 44 transitions. [2021-05-02 13:01:16,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,695 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 44 transitions. [2021-05-02 13:01:16,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:01:16,695 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:16,695 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:16,695 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 13:01:16,696 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:16,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:16,696 INFO L82 PathProgramCache]: Analyzing trace with hash -578961840, now seen corresponding path program 1 times [2021-05-02 13:01:16,696 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:16,696 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229559883] [2021-05-02 13:01:16,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:16,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:16,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:16,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:16,754 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:16,755 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:16,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229559883] [2021-05-02 13:01:16,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [229559883] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:01:16,755 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:01:16,755 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 13:01:16,755 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539226103] [2021-05-02 13:01:16,756 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:01:16,756 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:16,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:01:16,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:01:16,756 INFO L87 Difference]: Start difference. First operand 32 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:16,832 INFO L93 Difference]: Finished difference Result 44 states and 61 transitions. [2021-05-02 13:01:16,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:01:16,832 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:01:16,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:16,833 INFO L225 Difference]: With dead ends: 44 [2021-05-02 13:01:16,833 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 13:01:16,833 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 53.9ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:01:16,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 13:01:16,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 13:01:16,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 35 transitions. [2021-05-02 13:01:16,837 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 35 transitions. Word has length 17 [2021-05-02 13:01:16,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:16,837 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 35 transitions. [2021-05-02 13:01:16,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:16,837 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 35 transitions. [2021-05-02 13:01:16,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:01:16,838 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:16,838 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:16,838 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 13:01:16,838 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:16,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:16,838 INFO L82 PathProgramCache]: Analyzing trace with hash 388404751, now seen corresponding path program 1 times [2021-05-02 13:01:16,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:16,839 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570169912] [2021-05-02 13:01:16,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:16,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:16,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:16,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:16,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:16,895 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:16,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570169912] [2021-05-02 13:01:16,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570169912] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:16,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373426521] [2021-05-02 13:01:16,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:16,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:16,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:01:16,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:17,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:17,048 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:17,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [373426521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:17,049 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:17,049 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:01:17,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180040671] [2021-05-02 13:01:17,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:01:17,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:17,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:01:17,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:01:17,052 INFO L87 Difference]: Start difference. First operand 26 states and 35 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:17,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:17,215 INFO L93 Difference]: Finished difference Result 52 states and 75 transitions. [2021-05-02 13:01:17,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:01:17,215 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:01:17,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:17,216 INFO L225 Difference]: With dead ends: 52 [2021-05-02 13:01:17,216 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 13:01:17,217 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 113.8ms TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:01:17,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 13:01:17,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2021-05-02 13:01:17,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:17,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 43 transitions. [2021-05-02 13:01:17,227 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 43 transitions. Word has length 17 [2021-05-02 13:01:17,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:17,227 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 43 transitions. [2021-05-02 13:01:17,227 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:17,227 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 43 transitions. [2021-05-02 13:01:17,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 13:01:17,228 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:17,228 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:17,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 13:01:17,438 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:17,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:17,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1596703394, now seen corresponding path program 2 times [2021-05-02 13:01:17,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:17,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [271403971] [2021-05-02 13:01:17,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:17,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:17,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:17,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:17,527 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:17,527 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:17,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [271403971] [2021-05-02 13:01:17,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [271403971] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:17,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [586472973] [2021-05-02 13:01:17,528 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:17,561 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:17,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:17,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 13:01:17,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:17,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:17,637 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:17,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [586472973] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:17,637 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:17,637 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:01:17,637 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789099042] [2021-05-02 13:01:17,638 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:01:17,638 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:17,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:01:17,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:01:17,639 INFO L87 Difference]: Start difference. First operand 32 states and 43 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:17,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:17,841 INFO L93 Difference]: Finished difference Result 62 states and 90 transitions. [2021-05-02 13:01:17,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:01:17,842 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 13:01:17,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:17,842 INFO L225 Difference]: With dead ends: 62 [2021-05-02 13:01:17,843 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 13:01:17,843 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 148.8ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:01:17,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 13:01:17,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 37. [2021-05-02 13:01:17,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.4375) internal successors, (46), 32 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:17,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 50 transitions. [2021-05-02 13:01:17,847 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 50 transitions. Word has length 18 [2021-05-02 13:01:17,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:17,847 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 50 transitions. [2021-05-02 13:01:17,847 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:17,848 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 50 transitions. [2021-05-02 13:01:17,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 13:01:17,848 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:17,848 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:18,061 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:18,061 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:18,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:18,062 INFO L82 PathProgramCache]: Analyzing trace with hash 9935328, now seen corresponding path program 1 times [2021-05-02 13:01:18,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:18,062 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809117634] [2021-05-02 13:01:18,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:18,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:18,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:18,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:18,162 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:18,162 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:18,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809117634] [2021-05-02 13:01:18,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [809117634] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:18,163 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117556939] [2021-05-02 13:01:18,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:18,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:18,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:01:18,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:18,251 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:18,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117556939] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:18,252 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:18,252 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4] total 10 [2021-05-02 13:01:18,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169892543] [2021-05-02 13:01:18,252 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:01:18,252 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:18,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:01:18,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:01:18,253 INFO L87 Difference]: Start difference. First operand 37 states and 50 transitions. Second operand has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:18,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:18,636 INFO L93 Difference]: Finished difference Result 74 states and 106 transitions. [2021-05-02 13:01:18,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:01:18,636 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 13:01:18,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:18,637 INFO L225 Difference]: With dead ends: 74 [2021-05-02 13:01:18,637 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 13:01:18,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 307.0ms TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:01:18,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 13:01:18,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 51. [2021-05-02 13:01:18,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.391304347826087) internal successors, (64), 46 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:18,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 68 transitions. [2021-05-02 13:01:18,642 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 68 transitions. Word has length 19 [2021-05-02 13:01:18,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:18,643 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 68 transitions. [2021-05-02 13:01:18,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:18,643 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 68 transitions. [2021-05-02 13:01:18,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 13:01:18,643 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:18,643 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:18,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:18,861 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:18,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:18,861 INFO L82 PathProgramCache]: Analyzing trace with hash 399255663, now seen corresponding path program 3 times [2021-05-02 13:01:18,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:18,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330253625] [2021-05-02 13:01:18,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:18,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:18,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:18,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:18,931 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:18,932 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:18,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330253625] [2021-05-02 13:01:18,932 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330253625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:18,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147713492] [2021-05-02 13:01:18,932 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:18,973 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:01:18,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:18,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 13:01:18,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:19,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:19,037 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:19,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147713492] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:19,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:19,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:01:19,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494434452] [2021-05-02 13:01:19,038 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:01:19,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:19,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:01:19,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:01:19,040 INFO L87 Difference]: Start difference. First operand 51 states and 68 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:19,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:19,317 INFO L93 Difference]: Finished difference Result 103 states and 149 transitions. [2021-05-02 13:01:19,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:01:19,317 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 13:01:19,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:19,318 INFO L225 Difference]: With dead ends: 103 [2021-05-02 13:01:19,319 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 13:01:19,319 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 176.8ms TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:01:19,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 13:01:19,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 58. [2021-05-02 13:01:19,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.3962264150943395) internal successors, (74), 53 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:19,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 78 transitions. [2021-05-02 13:01:19,330 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 78 transitions. Word has length 19 [2021-05-02 13:01:19,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:19,331 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 78 transitions. [2021-05-02 13:01:19,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:19,331 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 78 transitions. [2021-05-02 13:01:19,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 13:01:19,334 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:19,334 INFO L523 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:19,549 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:19,550 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:19,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:19,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1933081666, now seen corresponding path program 4 times [2021-05-02 13:01:19,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:19,550 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397590216] [2021-05-02 13:01:19,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:19,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:19,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:19,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:19,645 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:19,645 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:19,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397590216] [2021-05-02 13:01:19,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397590216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:19,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163901566] [2021-05-02 13:01:19,645 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:19,679 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:01:19,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:19,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:01:19,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:19,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:19,734 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:19,734 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [163901566] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:19,734 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:19,735 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:01:19,735 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729526117] [2021-05-02 13:01:19,735 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:01:19,736 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:19,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:01:19,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:01:19,736 INFO L87 Difference]: Start difference. First operand 58 states and 78 transitions. Second operand has 10 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:20,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:20,023 INFO L93 Difference]: Finished difference Result 118 states and 172 transitions. [2021-05-02 13:01:20,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:01:20,024 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 13:01:20,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:20,025 INFO L225 Difference]: With dead ends: 118 [2021-05-02 13:01:20,025 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 13:01:20,025 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 161.3ms TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:01:20,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 13:01:20,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 65. [2021-05-02 13:01:20,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.4) internal successors, (84), 60 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:20,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 88 transitions. [2021-05-02 13:01:20,039 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 88 transitions. Word has length 20 [2021-05-02 13:01:20,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:20,040 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 88 transitions. [2021-05-02 13:01:20,040 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.9) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:20,040 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 88 transitions. [2021-05-02 13:01:20,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:01:20,041 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:20,041 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:20,248 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 13:01:20,249 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:20,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:20,249 INFO L82 PathProgramCache]: Analyzing trace with hash -1695200847, now seen corresponding path program 1 times [2021-05-02 13:01:20,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:20,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191590664] [2021-05-02 13:01:20,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:20,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:20,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:20,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:20,385 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:20,385 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:20,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191590664] [2021-05-02 13:01:20,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191590664] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:20,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455705897] [2021-05-02 13:01:20,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:20,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:20,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:01:20,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:20,472 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:01:20,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455705897] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:20,473 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:20,473 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 10 [2021-05-02 13:01:20,474 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793481571] [2021-05-02 13:01:20,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:01:20,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:20,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:01:20,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:01:20,476 INFO L87 Difference]: Start difference. First operand 65 states and 88 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:20,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:20,621 INFO L93 Difference]: Finished difference Result 73 states and 96 transitions. [2021-05-02 13:01:20,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:01:20,621 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 13:01:20,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:20,622 INFO L225 Difference]: With dead ends: 73 [2021-05-02 13:01:20,622 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 13:01:20,622 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 149.2ms TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:01:20,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 13:01:20,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-05-02 13:01:20,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.3934426229508197) internal successors, (85), 61 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:20,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 89 transitions. [2021-05-02 13:01:20,627 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 89 transitions. Word has length 21 [2021-05-02 13:01:20,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:20,627 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 89 transitions. [2021-05-02 13:01:20,627 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 7 states have internal predecessors, (22), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:20,627 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 89 transitions. [2021-05-02 13:01:20,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:01:20,628 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:20,628 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:20,837 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:20,837 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:20,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:20,838 INFO L82 PathProgramCache]: Analyzing trace with hash -2057919793, now seen corresponding path program 5 times [2021-05-02 13:01:20,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:20,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637905074] [2021-05-02 13:01:20,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:20,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:20,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:20,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:20,925 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:20,925 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:20,925 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637905074] [2021-05-02 13:01:20,925 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637905074] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:20,925 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115147407] [2021-05-02 13:01:20,925 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:20,972 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:01:20,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:20,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:01:20,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:20,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:20,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:21,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:21,025 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:21,025 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2115147407] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:21,025 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:21,025 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 13:01:21,025 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761285304] [2021-05-02 13:01:21,025 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:01:21,025 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:21,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:01:21,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:01:21,026 INFO L87 Difference]: Start difference. First operand 66 states and 89 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:21,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:21,406 INFO L93 Difference]: Finished difference Result 131 states and 192 transitions. [2021-05-02 13:01:21,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:01:21,406 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 13:01:21,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:21,407 INFO L225 Difference]: With dead ends: 131 [2021-05-02 13:01:21,407 INFO L226 Difference]: Without dead ends: 114 [2021-05-02 13:01:21,407 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 210.1ms TimeCoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:01:21,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-02 13:01:21,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 73. [2021-05-02 13:01:21,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.3970588235294117) internal successors, (95), 68 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:21,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 99 transitions. [2021-05-02 13:01:21,416 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 99 transitions. Word has length 21 [2021-05-02 13:01:21,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:21,417 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 99 transitions. [2021-05-02 13:01:21,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 10 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:21,417 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 99 transitions. [2021-05-02 13:01:21,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:01:21,418 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:21,418 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:21,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:21,629 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:21,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:21,629 INFO L82 PathProgramCache]: Analyzing trace with hash -439116189, now seen corresponding path program 2 times [2021-05-02 13:01:21,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:21,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299196455] [2021-05-02 13:01:21,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:21,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:21,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:21,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:21,689 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:01:21,689 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:21,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299196455] [2021-05-02 13:01:21,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299196455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:21,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1808939425] [2021-05-02 13:01:21,689 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:21,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:21,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:21,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:01:21,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:21,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:21,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:21,770 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:01:21,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1808939425] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:21,770 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:21,770 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2021-05-02 13:01:21,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885070670] [2021-05-02 13:01:21,771 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:01:21,771 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:21,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:01:21,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:01:21,771 INFO L87 Difference]: Start difference. First operand 73 states and 99 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:21,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:21,856 INFO L93 Difference]: Finished difference Result 88 states and 120 transitions. [2021-05-02 13:01:21,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:01:21,856 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 13:01:21,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:21,857 INFO L225 Difference]: With dead ends: 88 [2021-05-02 13:01:21,857 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 13:01:21,857 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 57.4ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:01:21,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 13:01:21,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 64. [2021-05-02 13:01:21,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.423728813559322) internal successors, (84), 59 states have internal predecessors, (84), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:21,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 88 transitions. [2021-05-02 13:01:21,869 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 88 transitions. Word has length 22 [2021-05-02 13:01:21,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:21,870 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 88 transitions. [2021-05-02 13:01:21,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:21,870 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 88 transitions. [2021-05-02 13:01:21,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:01:21,871 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:21,871 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:22,086 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 13:01:22,087 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:22,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:22,087 INFO L82 PathProgramCache]: Analyzing trace with hash 38994402, now seen corresponding path program 1 times [2021-05-02 13:01:22,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:22,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537776386] [2021-05-02 13:01:22,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:22,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:22,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:22,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:22,151 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:01:22,151 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:22,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537776386] [2021-05-02 13:01:22,151 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537776386] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:22,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2029705768] [2021-05-02 13:01:22,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:22,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:22,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:01:22,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:22,239 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:01:22,239 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2029705768] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:22,239 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:22,239 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-05-02 13:01:22,239 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573824031] [2021-05-02 13:01:22,239 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:01:22,239 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:22,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:01:22,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:01:22,240 INFO L87 Difference]: Start difference. First operand 64 states and 88 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:22,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:22,410 INFO L93 Difference]: Finished difference Result 87 states and 117 transitions. [2021-05-02 13:01:22,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:01:22,410 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 13:01:22,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:22,411 INFO L225 Difference]: With dead ends: 87 [2021-05-02 13:01:22,411 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 13:01:22,411 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 148.5ms TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:01:22,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 13:01:22,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 64. [2021-05-02 13:01:22,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.4067796610169492) internal successors, (83), 59 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:22,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 87 transitions. [2021-05-02 13:01:22,416 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 87 transitions. Word has length 22 [2021-05-02 13:01:22,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:22,416 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 87 transitions. [2021-05-02 13:01:22,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:22,416 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 87 transitions. [2021-05-02 13:01:22,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:01:22,416 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:22,416 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:22,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:22,636 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:22,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:22,637 INFO L82 PathProgramCache]: Analyzing trace with hash -462225342, now seen corresponding path program 2 times [2021-05-02 13:01:22,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:22,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594653773] [2021-05-02 13:01:22,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:22,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:22,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:22,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:22,734 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:22,735 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:22,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594653773] [2021-05-02 13:01:22,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1594653773] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:22,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122348022] [2021-05-02 13:01:22,735 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:22,782 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:22,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:22,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:01:22,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:22,846 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:01:22,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122348022] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:22,847 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:22,847 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5] total 13 [2021-05-02 13:01:22,847 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907138538] [2021-05-02 13:01:22,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:01:22,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:22,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:01:22,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:01:22,848 INFO L87 Difference]: Start difference. First operand 64 states and 87 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:23,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:23,651 INFO L93 Difference]: Finished difference Result 119 states and 172 transitions. [2021-05-02 13:01:23,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:01:23,651 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 13:01:23,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:23,652 INFO L225 Difference]: With dead ends: 119 [2021-05-02 13:01:23,652 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 13:01:23,652 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 649.7ms TimeCoverageRelationStatistics Valid=177, Invalid=815, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:01:23,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 13:01:23,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 85. [2021-05-02 13:01:23,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.375) internal successors, (110), 80 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:23,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 114 transitions. [2021-05-02 13:01:23,656 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 114 transitions. Word has length 22 [2021-05-02 13:01:23,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:23,657 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 114 transitions. [2021-05-02 13:01:23,657 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:23,657 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 114 transitions. [2021-05-02 13:01:23,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:01:23,657 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:23,657 INFO L523 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:23,868 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:01:23,869 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:23,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:23,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1224913438, now seen corresponding path program 6 times [2021-05-02 13:01:23,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:23,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879802750] [2021-05-02 13:01:23,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:23,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:23,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:23,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:23,971 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:23,971 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:23,971 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879802750] [2021-05-02 13:01:23,971 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879802750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:23,971 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158240955] [2021-05-02 13:01:23,971 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:24,037 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:01:24,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:24,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:01:24,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:24,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:24,085 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:24,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [158240955] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:24,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:24,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 13:01:24,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197074896] [2021-05-02 13:01:24,088 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:01:24,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:24,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:01:24,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:01:24,088 INFO L87 Difference]: Start difference. First operand 85 states and 114 transitions. Second operand has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:24,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:24,568 INFO L93 Difference]: Finished difference Result 180 states and 262 transitions. [2021-05-02 13:01:24,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:01:24,569 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 13:01:24,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:24,570 INFO L225 Difference]: With dead ends: 180 [2021-05-02 13:01:24,570 INFO L226 Difference]: Without dead ends: 160 [2021-05-02 13:01:24,570 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 238.5ms TimeCoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:01:24,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-05-02 13:01:24,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 94. [2021-05-02 13:01:24,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.3820224719101124) internal successors, (123), 89 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:24,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 127 transitions. [2021-05-02 13:01:24,577 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 127 transitions. Word has length 22 [2021-05-02 13:01:24,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:24,578 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 127 transitions. [2021-05-02 13:01:24,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 11 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:24,578 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 127 transitions. [2021-05-02 13:01:24,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 13:01:24,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:24,578 INFO L523 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:24,792 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 13:01:24,793 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:24,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:24,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1171520209, now seen corresponding path program 7 times [2021-05-02 13:01:24,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:24,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169290195] [2021-05-02 13:01:24,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:24,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:24,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:24,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:24,892 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:24,892 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:24,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169290195] [2021-05-02 13:01:24,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169290195] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:24,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885468146] [2021-05-02 13:01:24,892 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:24,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:24,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:01:24,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:24,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:24,974 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:24,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885468146] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:24,974 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:24,974 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 13:01:24,974 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497924516] [2021-05-02 13:01:24,974 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:01:24,974 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:24,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:01:24,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:01:24,975 INFO L87 Difference]: Start difference. First operand 94 states and 127 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:25,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:25,567 INFO L93 Difference]: Finished difference Result 199 states and 291 transitions. [2021-05-02 13:01:25,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:01:25,567 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 13:01:25,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:25,568 INFO L225 Difference]: With dead ends: 199 [2021-05-02 13:01:25,568 INFO L226 Difference]: Without dead ends: 179 [2021-05-02 13:01:25,569 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 282.5ms TimeCoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:01:25,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-02 13:01:25,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 103. [2021-05-02 13:01:25,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.3877551020408163) internal successors, (136), 98 states have internal predecessors, (136), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:25,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 140 transitions. [2021-05-02 13:01:25,575 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 140 transitions. Word has length 23 [2021-05-02 13:01:25,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:25,575 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 140 transitions. [2021-05-02 13:01:25,575 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:25,575 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 140 transitions. [2021-05-02 13:01:25,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 13:01:25,576 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:25,576 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:25,780 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 13:01:25,781 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:25,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:25,781 INFO L82 PathProgramCache]: Analyzing trace with hash -495266734, now seen corresponding path program 2 times [2021-05-02 13:01:25,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:25,781 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70837398] [2021-05-02 13:01:25,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:25,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:25,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:25,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:25,858 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:01:25,858 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:25,858 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70837398] [2021-05-02 13:01:25,858 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70837398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:25,858 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1096112390] [2021-05-02 13:01:25,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:25,897 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:25,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:25,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:01:25,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:25,952 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:01:25,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1096112390] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:25,952 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:25,952 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 11 [2021-05-02 13:01:25,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122152452] [2021-05-02 13:01:25,952 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:01:25,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:25,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:01:25,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:01:25,953 INFO L87 Difference]: Start difference. First operand 103 states and 140 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:26,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:26,250 INFO L93 Difference]: Finished difference Result 148 states and 196 transitions. [2021-05-02 13:01:26,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:01:26,250 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-02 13:01:26,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:26,251 INFO L225 Difference]: With dead ends: 148 [2021-05-02 13:01:26,251 INFO L226 Difference]: Without dead ends: 136 [2021-05-02 13:01:26,252 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 223.1ms TimeCoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:01:26,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-02 13:01:26,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 103. [2021-05-02 13:01:26,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.3775510204081634) internal successors, (135), 98 states have internal predecessors, (135), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:26,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 139 transitions. [2021-05-02 13:01:26,257 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 139 transitions. Word has length 24 [2021-05-02 13:01:26,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:26,257 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 139 transitions. [2021-05-02 13:01:26,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:26,257 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 139 transitions. [2021-05-02 13:01:26,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 13:01:26,257 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:26,257 INFO L523 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:26,474 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:01:26,474 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:26,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:26,475 INFO L82 PathProgramCache]: Analyzing trace with hash 483669890, now seen corresponding path program 8 times [2021-05-02 13:01:26,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:26,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238455591] [2021-05-02 13:01:26,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:26,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:26,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:26,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:26,605 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:26,605 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:26,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238455591] [2021-05-02 13:01:26,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238455591] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:26,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647273717] [2021-05-02 13:01:26,606 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:26,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:26,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:26,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 13:01:26,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:26,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:26,700 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:26,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647273717] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:26,700 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:26,700 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 13:01:26,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835140358] [2021-05-02 13:01:26,700 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:01:26,700 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:26,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:01:26,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:01:26,701 INFO L87 Difference]: Start difference. First operand 103 states and 139 transitions. Second operand has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:27,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:27,319 INFO L93 Difference]: Finished difference Result 218 states and 319 transitions. [2021-05-02 13:01:27,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:01:27,319 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-02 13:01:27,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:27,320 INFO L225 Difference]: With dead ends: 218 [2021-05-02 13:01:27,320 INFO L226 Difference]: Without dead ends: 198 [2021-05-02 13:01:27,320 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 305.7ms TimeCoverageRelationStatistics Valid=69, Invalid=483, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:01:27,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-05-02 13:01:27,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 112. [2021-05-02 13:01:27,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.3831775700934579) internal successors, (148), 107 states have internal predecessors, (148), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:27,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 152 transitions. [2021-05-02 13:01:27,326 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 152 transitions. Word has length 24 [2021-05-02 13:01:27,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:27,327 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 152 transitions. [2021-05-02 13:01:27,327 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:27,327 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 152 transitions. [2021-05-02 13:01:27,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 13:01:27,327 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:27,327 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:27,542 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:27,542 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:27,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:27,542 INFO L82 PathProgramCache]: Analyzing trace with hash -1097749168, now seen corresponding path program 3 times [2021-05-02 13:01:27,543 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:27,543 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362854973] [2021-05-02 13:01:27,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:27,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:27,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:27,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:27,593 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:01:27,593 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:27,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362854973] [2021-05-02 13:01:27,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1362854973] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:27,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054336133] [2021-05-02 13:01:27,593 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:27,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:01:27,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:27,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 13:01:27,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:27,661 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:01:27,661 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1054336133] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:27,661 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:27,661 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-05-02 13:01:27,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461613969] [2021-05-02 13:01:27,661 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:01:27,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:27,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:01:27,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:01:27,662 INFO L87 Difference]: Start difference. First operand 112 states and 152 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:27,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:27,871 INFO L93 Difference]: Finished difference Result 135 states and 183 transitions. [2021-05-02 13:01:27,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:01:27,871 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 13:01:27,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:27,872 INFO L225 Difference]: With dead ends: 135 [2021-05-02 13:01:27,872 INFO L226 Difference]: Without dead ends: 126 [2021-05-02 13:01:27,872 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 26 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 136.5ms TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:01:27,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-02 13:01:27,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 115. [2021-05-02 13:01:27,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.3727272727272728) internal successors, (151), 110 states have internal predecessors, (151), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:27,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 155 transitions. [2021-05-02 13:01:27,878 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 155 transitions. Word has length 25 [2021-05-02 13:01:27,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:27,878 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 155 transitions. [2021-05-02 13:01:27,878 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:27,878 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 155 transitions. [2021-05-02 13:01:27,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 13:01:27,879 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:27,879 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:28,080 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:28,084 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:28,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:28,085 INFO L82 PathProgramCache]: Analyzing trace with hash -1115860192, now seen corresponding path program 3 times [2021-05-02 13:01:28,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:28,085 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344177623] [2021-05-02 13:01:28,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:28,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:28,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:28,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:28,260 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:28,260 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:28,260 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344177623] [2021-05-02 13:01:28,260 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [344177623] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:28,260 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978011318] [2021-05-02 13:01:28,260 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:28,297 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:01:28,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:28,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:01:28,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:28,375 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:01:28,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978011318] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:28,376 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:28,376 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 6] total 16 [2021-05-02 13:01:28,376 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399010071] [2021-05-02 13:01:28,376 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:01:28,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:28,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:01:28,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:01:28,377 INFO L87 Difference]: Start difference. First operand 115 states and 155 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:30,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:30,420 INFO L93 Difference]: Finished difference Result 208 states and 293 transitions. [2021-05-02 13:01:30,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 13:01:30,420 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 13:01:30,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:30,421 INFO L225 Difference]: With dead ends: 208 [2021-05-02 13:01:30,421 INFO L226 Difference]: Without dead ends: 189 [2021-05-02 13:01:30,422 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 895 ImplicationChecksByTransitivity, 1720.7ms TimeCoverageRelationStatistics Valid=480, Invalid=2942, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:01:30,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-05-02 13:01:30,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 139. [2021-05-02 13:01:30,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.3582089552238805) internal successors, (182), 134 states have internal predecessors, (182), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:30,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 186 transitions. [2021-05-02 13:01:30,428 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 186 transitions. Word has length 25 [2021-05-02 13:01:30,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:30,428 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 186 transitions. [2021-05-02 13:01:30,429 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:30,429 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 186 transitions. [2021-05-02 13:01:30,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 13:01:30,429 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:30,429 INFO L523 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:30,632 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:30,633 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:30,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:30,633 INFO L82 PathProgramCache]: Analyzing trace with hash 254955407, now seen corresponding path program 9 times [2021-05-02 13:01:30,633 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:30,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424355947] [2021-05-02 13:01:30,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:30,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:30,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:30,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:30,757 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:30,757 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:30,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [424355947] [2021-05-02 13:01:30,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [424355947] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:30,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381380265] [2021-05-02 13:01:30,757 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:30,818 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 13:01:30,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:30,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:01:30,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:30,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:30,877 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:30,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1381380265] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:30,877 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:30,878 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 13:01:30,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379526304] [2021-05-02 13:01:30,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:01:30,878 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:30,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:01:30,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:01:30,878 INFO L87 Difference]: Start difference. First operand 139 states and 186 transitions. Second operand has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:31,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:31,629 INFO L93 Difference]: Finished difference Result 297 states and 435 transitions. [2021-05-02 13:01:31,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:01:31,630 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 13:01:31,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:31,631 INFO L225 Difference]: With dead ends: 297 [2021-05-02 13:01:31,631 INFO L226 Difference]: Without dead ends: 274 [2021-05-02 13:01:31,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 344.2ms TimeCoverageRelationStatistics Valid=75, Invalid=575, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:01:31,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2021-05-02 13:01:31,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 150. [2021-05-02 13:01:31,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 145 states have (on average 1.3655172413793104) internal successors, (198), 145 states have internal predecessors, (198), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:31,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 202 transitions. [2021-05-02 13:01:31,640 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 202 transitions. Word has length 25 [2021-05-02 13:01:31,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:31,640 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 202 transitions. [2021-05-02 13:01:31,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.6) internal successors, (24), 14 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:31,641 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 202 transitions. [2021-05-02 13:01:31,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 13:01:31,641 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:31,641 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:31,843 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 13:01:31,843 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:31,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:31,844 INFO L82 PathProgramCache]: Analyzing trace with hash -137630238, now seen corresponding path program 4 times [2021-05-02 13:01:31,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:31,844 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234223482] [2021-05-02 13:01:31,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:31,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:31,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:31,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:31,957 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:01:31,958 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:31,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234223482] [2021-05-02 13:01:31,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234223482] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:31,958 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674370608] [2021-05-02 13:01:31,958 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:31,995 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:01:31,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:31,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 13:01:31,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:32,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:32,058 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:01:32,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1674370608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:32,058 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:32,058 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 11 [2021-05-02 13:01:32,058 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84199329] [2021-05-02 13:01:32,059 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:01:32,059 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:32,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:01:32,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:01:32,059 INFO L87 Difference]: Start difference. First operand 150 states and 202 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:32,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:32,256 INFO L93 Difference]: Finished difference Result 159 states and 211 transitions. [2021-05-02 13:01:32,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:01:32,257 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 13:01:32,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:32,257 INFO L225 Difference]: With dead ends: 159 [2021-05-02 13:01:32,257 INFO L226 Difference]: Without dead ends: 151 [2021-05-02 13:01:32,258 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 25 SyntacticMatches, 6 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 179.6ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:01:32,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-02 13:01:32,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-05-02 13:01:32,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.3630136986301369) internal successors, (199), 146 states have internal predecessors, (199), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:32,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 203 transitions. [2021-05-02 13:01:32,264 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 203 transitions. Word has length 26 [2021-05-02 13:01:32,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:32,264 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 203 transitions. [2021-05-02 13:01:32,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 8 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:32,265 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 203 transitions. [2021-05-02 13:01:32,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 13:01:32,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:32,265 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:32,481 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 13:01:32,481 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:32,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:32,482 INFO L82 PathProgramCache]: Analyzing trace with hash -32897246, now seen corresponding path program 3 times [2021-05-02 13:01:32,482 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:32,482 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477767001] [2021-05-02 13:01:32,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:32,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:32,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:32,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:32,574 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-05-02 13:01:32,574 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:32,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477767001] [2021-05-02 13:01:32,574 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1477767001] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:32,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [829931724] [2021-05-02 13:01:32,574 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:32,634 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:01:32,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:32,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:01:32,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:32,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:32,678 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-05-02 13:01:32,679 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [829931724] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:32,679 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:32,679 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 13:01:32,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310104166] [2021-05-02 13:01:32,680 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:01:32,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:32,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:01:32,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:01:32,680 INFO L87 Difference]: Start difference. First operand 151 states and 203 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:33,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:33,044 INFO L93 Difference]: Finished difference Result 219 states and 287 transitions. [2021-05-02 13:01:33,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:01:33,045 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 13:01:33,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:33,045 INFO L225 Difference]: With dead ends: 219 [2021-05-02 13:01:33,045 INFO L226 Difference]: Without dead ends: 206 [2021-05-02 13:01:33,046 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 229.0ms TimeCoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:01:33,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-02 13:01:33,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 151. [2021-05-02 13:01:33,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.356164383561644) internal successors, (198), 146 states have internal predecessors, (198), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:33,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 202 transitions. [2021-05-02 13:01:33,052 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 202 transitions. Word has length 26 [2021-05-02 13:01:33,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:33,053 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 202 transitions. [2021-05-02 13:01:33,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:33,053 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 202 transitions. [2021-05-02 13:01:33,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 13:01:33,053 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:33,053 INFO L523 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:33,268 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 13:01:33,269 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:33,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:33,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1754741026, now seen corresponding path program 10 times [2021-05-02 13:01:33,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:33,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96544692] [2021-05-02 13:01:33,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:33,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:33,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:33,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:33,407 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:33,407 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:33,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96544692] [2021-05-02 13:01:33,408 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96544692] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:33,408 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657509265] [2021-05-02 13:01:33,408 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:33,439 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:01:33,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:33,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:01:33,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:33,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:33,504 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:33,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657509265] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:33,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:33,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 13:01:33,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631558507] [2021-05-02 13:01:33,504 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:01:33,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:33,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:01:33,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:01:33,505 INFO L87 Difference]: Start difference. First operand 151 states and 202 transitions. Second operand has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:34,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:34,334 INFO L93 Difference]: Finished difference Result 321 states and 470 transitions. [2021-05-02 13:01:34,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:01:34,335 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 13:01:34,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:34,336 INFO L225 Difference]: With dead ends: 321 [2021-05-02 13:01:34,336 INFO L226 Difference]: Without dead ends: 298 [2021-05-02 13:01:34,336 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 388.6ms TimeCoverageRelationStatistics Valid=81, Invalid=675, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:01:34,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-05-02 13:01:34,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 162. [2021-05-02 13:01:34,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 157 states have (on average 1.3630573248407643) internal successors, (214), 157 states have internal predecessors, (214), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:34,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 218 transitions. [2021-05-02 13:01:34,344 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 218 transitions. Word has length 26 [2021-05-02 13:01:34,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:34,344 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 218 transitions. [2021-05-02 13:01:34,344 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.5625) internal successors, (25), 15 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:34,344 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 218 transitions. [2021-05-02 13:01:34,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:01:34,344 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:34,344 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:34,559 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 13:01:34,559 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:34,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:34,560 INFO L82 PathProgramCache]: Analyzing trace with hash -438714480, now seen corresponding path program 5 times [2021-05-02 13:01:34,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:34,560 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335417869] [2021-05-02 13:01:34,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:34,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:34,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:34,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:34,613 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:01:34,613 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:34,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335417869] [2021-05-02 13:01:34,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335417869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:34,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547615544] [2021-05-02 13:01:34,614 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:34,657 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 13:01:34,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:34,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:01:34,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:34,696 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:01:34,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1547615544] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:34,696 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:34,696 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2021-05-02 13:01:34,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179765894] [2021-05-02 13:01:34,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:01:34,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:34,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:01:34,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:01:34,697 INFO L87 Difference]: Start difference. First operand 162 states and 218 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:34,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:34,832 INFO L93 Difference]: Finished difference Result 184 states and 247 transitions. [2021-05-02 13:01:34,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:01:34,833 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 13:01:34,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:34,833 INFO L225 Difference]: With dead ends: 184 [2021-05-02 13:01:34,833 INFO L226 Difference]: Without dead ends: 162 [2021-05-02 13:01:34,834 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 82.1ms TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:01:34,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-02 13:01:34,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 151. [2021-05-02 13:01:34,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.3767123287671232) internal successors, (201), 146 states have internal predecessors, (201), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:34,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 205 transitions. [2021-05-02 13:01:34,840 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 205 transitions. Word has length 27 [2021-05-02 13:01:34,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:34,840 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 205 transitions. [2021-05-02 13:01:34,840 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:34,841 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 205 transitions. [2021-05-02 13:01:34,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:01:34,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:34,841 INFO L523 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:35,056 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 13:01:35,056 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:35,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:35,057 INFO L82 PathProgramCache]: Analyzing trace with hash 1003454959, now seen corresponding path program 11 times [2021-05-02 13:01:35,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:35,057 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974023215] [2021-05-02 13:01:35,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:35,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:35,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:35,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:35,213 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:35,213 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:35,213 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974023215] [2021-05-02 13:01:35,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974023215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:35,213 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296417662] [2021-05-02 13:01:35,213 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:35,332 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-05-02 13:01:35,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:35,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:01:35,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:35,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:35,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:35,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:35,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:35,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:35,395 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:35,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296417662] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:35,396 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:35,396 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 13:01:35,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922394236] [2021-05-02 13:01:35,396 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:01:35,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:35,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:01:35,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:01:35,397 INFO L87 Difference]: Start difference. First operand 151 states and 205 transitions. Second operand has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:36,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:36,352 INFO L93 Difference]: Finished difference Result 326 states and 477 transitions. [2021-05-02 13:01:36,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 13:01:36,352 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 13:01:36,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:36,353 INFO L225 Difference]: With dead ends: 326 [2021-05-02 13:01:36,353 INFO L226 Difference]: Without dead ends: 303 [2021-05-02 13:01:36,354 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 437.9ms TimeCoverageRelationStatistics Valid=87, Invalid=783, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:01:36,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-05-02 13:01:36,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 162. [2021-05-02 13:01:36,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 157 states have (on average 1.3821656050955413) internal successors, (217), 157 states have internal predecessors, (217), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:36,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 221 transitions. [2021-05-02 13:01:36,361 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 221 transitions. Word has length 27 [2021-05-02 13:01:36,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:36,362 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 221 transitions. [2021-05-02 13:01:36,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 16 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:36,362 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 221 transitions. [2021-05-02 13:01:36,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:01:36,362 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:36,362 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:36,565 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:36,565 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:36,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:36,565 INFO L82 PathProgramCache]: Analyzing trace with hash -173294718, now seen corresponding path program 4 times [2021-05-02 13:01:36,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:36,565 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139240125] [2021-05-02 13:01:36,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:36,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:36,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:36,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:36,661 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 13:01:36,661 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:36,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139240125] [2021-05-02 13:01:36,661 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139240125] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:36,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [911044509] [2021-05-02 13:01:36,661 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:36,699 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:01:36,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:36,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:01:36,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:36,768 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 13:01:36,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [911044509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:36,768 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:36,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 14 [2021-05-02 13:01:36,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148039189] [2021-05-02 13:01:36,768 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:01:36,769 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:36,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:01:36,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:01:36,770 INFO L87 Difference]: Start difference. First operand 162 states and 221 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:37,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:37,188 INFO L93 Difference]: Finished difference Result 222 states and 295 transitions. [2021-05-02 13:01:37,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:01:37,189 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 13:01:37,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:37,190 INFO L225 Difference]: With dead ends: 222 [2021-05-02 13:01:37,190 INFO L226 Difference]: Without dead ends: 208 [2021-05-02 13:01:37,190 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 321.1ms TimeCoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:01:37,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-02 13:01:37,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 162. [2021-05-02 13:01:37,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 157 states have (on average 1.375796178343949) internal successors, (216), 157 states have internal predecessors, (216), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:37,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 220 transitions. [2021-05-02 13:01:37,198 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 220 transitions. Word has length 28 [2021-05-02 13:01:37,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:37,198 INFO L480 AbstractCegarLoop]: Abstraction has 162 states and 220 transitions. [2021-05-02 13:01:37,198 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:37,198 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 220 transitions. [2021-05-02 13:01:37,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:01:37,198 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:37,198 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:37,416 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 13:01:37,417 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:37,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:37,417 INFO L82 PathProgramCache]: Analyzing trace with hash 2128187618, now seen corresponding path program 5 times [2021-05-02 13:01:37,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:37,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119649069] [2021-05-02 13:01:37,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:37,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:37,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:37,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:37,525 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-05-02 13:01:37,525 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:37,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119649069] [2021-05-02 13:01:37,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119649069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:37,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191103670] [2021-05-02 13:01:37,525 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:37,582 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 13:01:37,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:37,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:01:37,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:37,661 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 13:01:37,661 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191103670] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:37,661 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:37,662 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 6] total 16 [2021-05-02 13:01:37,662 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383326183] [2021-05-02 13:01:37,662 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:01:37,662 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:37,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:01:37,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:01:37,662 INFO L87 Difference]: Start difference. First operand 162 states and 220 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:39,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:39,541 INFO L93 Difference]: Finished difference Result 272 states and 375 transitions. [2021-05-02 13:01:39,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 13:01:39,541 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 13:01:39,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:39,542 INFO L225 Difference]: With dead ends: 272 [2021-05-02 13:01:39,542 INFO L226 Difference]: Without dead ends: 255 [2021-05-02 13:01:39,543 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 849 ImplicationChecksByTransitivity, 1389.9ms TimeCoverageRelationStatistics Valid=415, Invalid=2891, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:01:39,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2021-05-02 13:01:39,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 165. [2021-05-02 13:01:39,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 160 states have (on average 1.3625) internal successors, (218), 160 states have internal predecessors, (218), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:39,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 222 transitions. [2021-05-02 13:01:39,551 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 222 transitions. Word has length 28 [2021-05-02 13:01:39,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:39,551 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 222 transitions. [2021-05-02 13:01:39,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:39,551 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 222 transitions. [2021-05-02 13:01:39,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:01:39,552 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:39,552 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:39,760 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 13:01:39,761 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:39,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:39,761 INFO L82 PathProgramCache]: Analyzing trace with hash 401313666, now seen corresponding path program 4 times [2021-05-02 13:01:39,761 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:39,761 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965243569] [2021-05-02 13:01:39,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:39,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:39,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:39,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:39,890 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:39,890 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:39,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965243569] [2021-05-02 13:01:39,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965243569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:39,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178789028] [2021-05-02 13:01:39,890 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:39,928 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:01:39,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:39,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:01:39,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:40,032 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 13:01:40,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178789028] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:40,032 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:40,032 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7] total 19 [2021-05-02 13:01:40,032 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458493651] [2021-05-02 13:01:40,033 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:01:40,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:40,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:01:40,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:01:40,033 INFO L87 Difference]: Start difference. First operand 165 states and 222 transitions. Second operand has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:44,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:44,004 INFO L93 Difference]: Finished difference Result 284 states and 402 transitions. [2021-05-02 13:01:44,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-02 13:01:44,005 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 13:01:44,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:44,006 INFO L225 Difference]: With dead ends: 284 [2021-05-02 13:01:44,006 INFO L226 Difference]: Without dead ends: 270 [2021-05-02 13:01:44,008 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2120 ImplicationChecksByTransitivity, 3271.5ms TimeCoverageRelationStatistics Valid=840, Invalid=6300, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 13:01:44,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2021-05-02 13:01:44,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 195. [2021-05-02 13:01:44,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 190 states have (on average 1.3578947368421053) internal successors, (258), 190 states have internal predecessors, (258), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:44,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 262 transitions. [2021-05-02 13:01:44,016 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 262 transitions. Word has length 28 [2021-05-02 13:01:44,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:44,016 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 262 transitions. [2021-05-02 13:01:44,016 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:44,016 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 262 transitions. [2021-05-02 13:01:44,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:01:44,017 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:44,017 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:44,232 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:44,232 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:44,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:44,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1899162222, now seen corresponding path program 6 times [2021-05-02 13:01:44,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:44,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491318747] [2021-05-02 13:01:44,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:44,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:44,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:44,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:44,325 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:01:44,325 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:44,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491318747] [2021-05-02 13:01:44,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491318747] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:44,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1897517668] [2021-05-02 13:01:44,325 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:44,365 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:01:44,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:44,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:01:44,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:44,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:44,414 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:01:44,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1897517668] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:44,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:44,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 13:01:44,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570011309] [2021-05-02 13:01:44,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:01:44,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:44,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:01:44,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:01:44,415 INFO L87 Difference]: Start difference. First operand 195 states and 262 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:44,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:44,851 INFO L93 Difference]: Finished difference Result 291 states and 379 transitions. [2021-05-02 13:01:44,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:01:44,851 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 13:01:44,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:44,852 INFO L225 Difference]: With dead ends: 291 [2021-05-02 13:01:44,852 INFO L226 Difference]: Without dead ends: 277 [2021-05-02 13:01:44,853 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 270.0ms TimeCoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:01:44,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2021-05-02 13:01:44,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 195. [2021-05-02 13:01:44,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 190 states have (on average 1.3526315789473684) internal successors, (257), 190 states have internal predecessors, (257), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:44,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 261 transitions. [2021-05-02 13:01:44,864 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 261 transitions. Word has length 28 [2021-05-02 13:01:44,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:44,864 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 261 transitions. [2021-05-02 13:01:44,864 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:44,864 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 261 transitions. [2021-05-02 13:01:44,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:01:44,865 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:44,865 INFO L523 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:45,080 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:45,081 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:45,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:45,081 INFO L82 PathProgramCache]: Analyzing trace with hash -811576638, now seen corresponding path program 12 times [2021-05-02 13:01:45,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:45,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513823839] [2021-05-02 13:01:45,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:45,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:45,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:45,245 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:45,245 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:45,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513823839] [2021-05-02 13:01:45,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1513823839] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:45,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721518163] [2021-05-02 13:01:45,245 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:45,383 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 13:01:45,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:45,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:01:45,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:45,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:45,440 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:45,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721518163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:45,440 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:45,440 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 13:01:45,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247845657] [2021-05-02 13:01:45,440 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:01:45,440 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:45,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:01:45,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:01:45,441 INFO L87 Difference]: Start difference. First operand 195 states and 261 transitions. Second operand has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:46,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:46,550 INFO L93 Difference]: Finished difference Result 424 states and 620 transitions. [2021-05-02 13:01:46,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:01:46,551 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 13:01:46,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:46,552 INFO L225 Difference]: With dead ends: 424 [2021-05-02 13:01:46,552 INFO L226 Difference]: Without dead ends: 398 [2021-05-02 13:01:46,552 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 463.5ms TimeCoverageRelationStatistics Valid=93, Invalid=899, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:01:46,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-05-02 13:01:46,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 208. [2021-05-02 13:01:46,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 203 states have (on average 1.3596059113300492) internal successors, (276), 203 states have internal predecessors, (276), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:46,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 280 transitions. [2021-05-02 13:01:46,563 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 280 transitions. Word has length 28 [2021-05-02 13:01:46,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:46,563 INFO L480 AbstractCegarLoop]: Abstraction has 208 states and 280 transitions. [2021-05-02 13:01:46,563 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.5) internal successors, (27), 17 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:46,563 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 280 transitions. [2021-05-02 13:01:46,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 13:01:46,563 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:46,563 INFO L523 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:46,766 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-02 13:01:46,767 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:46,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:46,767 INFO L82 PathProgramCache]: Analyzing trace with hash -1242981297, now seen corresponding path program 13 times [2021-05-02 13:01:46,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:46,767 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537181870] [2021-05-02 13:01:46,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:46,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:46,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:46,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:46,970 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:46,970 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:46,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537181870] [2021-05-02 13:01:46,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537181870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:46,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275565280] [2021-05-02 13:01:46,970 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:47,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:47,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:01:47,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:47,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:47,071 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:47,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [275565280] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:47,071 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:47,071 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 13:01:47,072 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724571498] [2021-05-02 13:01:47,072 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:01:47,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:47,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:01:47,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:01:47,072 INFO L87 Difference]: Start difference. First operand 208 states and 280 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:48,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:48,264 INFO L93 Difference]: Finished difference Result 452 states and 663 transitions. [2021-05-02 13:01:48,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:01:48,264 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 13:01:48,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:48,265 INFO L225 Difference]: With dead ends: 452 [2021-05-02 13:01:48,265 INFO L226 Difference]: Without dead ends: 426 [2021-05-02 13:01:48,266 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 515.4ms TimeCoverageRelationStatistics Valid=99, Invalid=1023, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:01:48,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2021-05-02 13:01:48,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 221. [2021-05-02 13:01:48,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 216 states have (on average 1.3657407407407407) internal successors, (295), 216 states have internal predecessors, (295), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:48,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 299 transitions. [2021-05-02 13:01:48,276 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 299 transitions. Word has length 29 [2021-05-02 13:01:48,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:48,277 INFO L480 AbstractCegarLoop]: Abstraction has 221 states and 299 transitions. [2021-05-02 13:01:48,277 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:48,277 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 299 transitions. [2021-05-02 13:01:48,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 13:01:48,277 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:48,277 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:48,493 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:48,493 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:48,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:48,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1456672573, now seen corresponding path program 6 times [2021-05-02 13:01:48,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:48,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967499199] [2021-05-02 13:01:48,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:48,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:48,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:48,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:48,593 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:01:48,593 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:48,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967499199] [2021-05-02 13:01:48,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [967499199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:48,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268663912] [2021-05-02 13:01:48,593 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:48,645 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 13:01:48,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:48,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:01:48,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:48,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:48,746 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:01:48,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268663912] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:48,747 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:48,747 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 7 [2021-05-02 13:01:48,747 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102302304] [2021-05-02 13:01:48,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:01:48,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:48,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:01:48,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:01:48,747 INFO L87 Difference]: Start difference. First operand 221 states and 299 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:49,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:49,066 INFO L93 Difference]: Finished difference Result 257 states and 344 transitions. [2021-05-02 13:01:49,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:01:49,067 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 13:01:49,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:49,068 INFO L225 Difference]: With dead ends: 257 [2021-05-02 13:01:49,068 INFO L226 Difference]: Without dead ends: 247 [2021-05-02 13:01:49,068 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 244.3ms TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:01:49,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-05-02 13:01:49,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 224. [2021-05-02 13:01:49,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 219 states have (on average 1.360730593607306) internal successors, (298), 219 states have internal predecessors, (298), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:49,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 302 transitions. [2021-05-02 13:01:49,078 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 302 transitions. Word has length 30 [2021-05-02 13:01:49,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:49,078 INFO L480 AbstractCegarLoop]: Abstraction has 224 states and 302 transitions. [2021-05-02 13:01:49,078 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:49,078 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 302 transitions. [2021-05-02 13:01:49,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 13:01:49,079 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:49,079 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:49,292 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 13:01:49,293 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:49,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:49,293 INFO L82 PathProgramCache]: Analyzing trace with hash 1500556532, now seen corresponding path program 7 times [2021-05-02 13:01:49,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:49,293 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718694171] [2021-05-02 13:01:49,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:49,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:49,399 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:49,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:49,401 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 13:01:49,402 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:49,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718694171] [2021-05-02 13:01:49,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [718694171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:49,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698322682] [2021-05-02 13:01:49,402 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:49,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:49,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:01:49,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:49,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:49,488 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-05-02 13:01:49,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [698322682] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:49,489 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:49,489 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 13:01:49,489 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553655712] [2021-05-02 13:01:49,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:01:49,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:49,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:01:49,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:01:49,490 INFO L87 Difference]: Start difference. First operand 224 states and 302 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:49,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:49,999 INFO L93 Difference]: Finished difference Result 312 states and 410 transitions. [2021-05-02 13:01:49,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:01:49,999 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 13:01:49,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:50,000 INFO L225 Difference]: With dead ends: 312 [2021-05-02 13:01:50,000 INFO L226 Difference]: Without dead ends: 297 [2021-05-02 13:01:50,000 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 345.6ms TimeCoverageRelationStatistics Valid=92, Invalid=508, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:01:50,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-05-02 13:01:50,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 224. [2021-05-02 13:01:50,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 219 states have (on average 1.356164383561644) internal successors, (297), 219 states have internal predecessors, (297), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:50,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 301 transitions. [2021-05-02 13:01:50,012 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 301 transitions. Word has length 30 [2021-05-02 13:01:50,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:50,013 INFO L480 AbstractCegarLoop]: Abstraction has 224 states and 301 transitions. [2021-05-02 13:01:50,013 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:50,013 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 301 transitions. [2021-05-02 13:01:50,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 13:01:50,013 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:50,013 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:50,222 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:50,222 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:50,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:50,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1702554722, now seen corresponding path program 8 times [2021-05-02 13:01:50,223 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:50,223 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [839597356] [2021-05-02 13:01:50,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:50,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:50,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:50,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:50,324 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:01:50,324 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:50,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [839597356] [2021-05-02 13:01:50,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [839597356] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:50,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662508264] [2021-05-02 13:01:50,325 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:50,367 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:50,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:50,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:01:50,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:50,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:50,416 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:01:50,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662508264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:50,416 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:50,417 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 13:01:50,417 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869499362] [2021-05-02 13:01:50,417 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:01:50,417 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:50,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:01:50,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:01:50,417 INFO L87 Difference]: Start difference. First operand 224 states and 301 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:50,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:50,912 INFO L93 Difference]: Finished difference Result 335 states and 436 transitions. [2021-05-02 13:01:50,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:01:50,912 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 13:01:50,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:50,913 INFO L225 Difference]: With dead ends: 335 [2021-05-02 13:01:50,913 INFO L226 Difference]: Without dead ends: 320 [2021-05-02 13:01:50,914 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 297.4ms TimeCoverageRelationStatistics Valid=74, Invalid=432, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:01:50,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-05-02 13:01:50,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 224. [2021-05-02 13:01:50,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 219 states have (on average 1.3515981735159817) internal successors, (296), 219 states have internal predecessors, (296), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:50,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 300 transitions. [2021-05-02 13:01:50,927 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 300 transitions. Word has length 30 [2021-05-02 13:01:50,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:50,928 INFO L480 AbstractCegarLoop]: Abstraction has 224 states and 300 transitions. [2021-05-02 13:01:50,928 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 12 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:50,928 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 300 transitions. [2021-05-02 13:01:50,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 13:01:50,928 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:50,928 INFO L523 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:51,136 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 13:01:51,137 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:51,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:51,137 INFO L82 PathProgramCache]: Analyzing trace with hash -1731623838, now seen corresponding path program 14 times [2021-05-02 13:01:51,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:51,137 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468643570] [2021-05-02 13:01:51,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:51,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:51,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:51,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:51,333 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:51,333 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:51,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468643570] [2021-05-02 13:01:51,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468643570] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:51,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1836725004] [2021-05-02 13:01:51,333 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:51,371 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:01:51,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:51,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 13:01:51,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:51,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:51,430 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:51,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1836725004] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:51,430 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:51,430 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 13:01:51,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707250406] [2021-05-02 13:01:51,431 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 13:01:51,431 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:51,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 13:01:51,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:01:51,432 INFO L87 Difference]: Start difference. First operand 224 states and 300 transitions. Second operand has 20 states, 20 states have (on average 1.45) internal successors, (29), 19 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:52,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:52,710 INFO L93 Difference]: Finished difference Result 485 states and 708 transitions. [2021-05-02 13:01:52,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:01:52,710 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.45) internal successors, (29), 19 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 13:01:52,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:52,711 INFO L225 Difference]: With dead ends: 485 [2021-05-02 13:01:52,712 INFO L226 Difference]: Without dead ends: 457 [2021-05-02 13:01:52,712 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 543.4ms TimeCoverageRelationStatistics Valid=105, Invalid=1155, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:01:52,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-05-02 13:01:52,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 237. [2021-05-02 13:01:52,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 232 states have (on average 1.3577586206896552) internal successors, (315), 232 states have internal predecessors, (315), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:52,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 319 transitions. [2021-05-02 13:01:52,722 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 319 transitions. Word has length 30 [2021-05-02 13:01:52,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:52,723 INFO L480 AbstractCegarLoop]: Abstraction has 237 states and 319 transitions. [2021-05-02 13:01:52,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.45) internal successors, (29), 19 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:52,723 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 319 transitions. [2021-05-02 13:01:52,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:01:52,723 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:52,723 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:52,923 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 13:01:52,924 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:52,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:52,924 INFO L82 PathProgramCache]: Analyzing trace with hash -543637167, now seen corresponding path program 7 times [2021-05-02 13:01:52,924 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:52,924 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863579581] [2021-05-02 13:01:52,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:52,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:53,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:53,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:53,171 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:01:53,171 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:53,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863579581] [2021-05-02 13:01:53,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863579581] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:53,171 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160391153] [2021-05-02 13:01:53,171 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:53,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:53,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 13:01:53,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:53,308 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:01:53,308 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160391153] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:53,308 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:53,308 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 18 [2021-05-02 13:01:53,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656997589] [2021-05-02 13:01:53,308 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:01:53,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:53,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:01:53,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=261, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:01:53,309 INFO L87 Difference]: Start difference. First operand 237 states and 319 transitions. Second operand has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 15 states have internal predecessors, (47), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:53,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:53,719 INFO L93 Difference]: Finished difference Result 247 states and 329 transitions. [2021-05-02 13:01:53,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:01:53,720 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 15 states have internal predecessors, (47), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 13:01:53,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:53,720 INFO L225 Difference]: With dead ends: 247 [2021-05-02 13:01:53,721 INFO L226 Difference]: Without dead ends: 238 [2021-05-02 13:01:53,721 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 30 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 470.9ms TimeCoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:01:53,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-05-02 13:01:53,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 238. [2021-05-02 13:01:53,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 233 states have (on average 1.3562231759656653) internal successors, (316), 233 states have internal predecessors, (316), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:53,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 320 transitions. [2021-05-02 13:01:53,731 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 320 transitions. Word has length 31 [2021-05-02 13:01:53,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:53,731 INFO L480 AbstractCegarLoop]: Abstraction has 238 states and 320 transitions. [2021-05-02 13:01:53,731 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.611111111111111) internal successors, (47), 15 states have internal predecessors, (47), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:53,731 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 320 transitions. [2021-05-02 13:01:53,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:01:53,732 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:53,732 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:53,937 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 13:01:53,937 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:53,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:53,938 INFO L82 PathProgramCache]: Analyzing trace with hash -604600770, now seen corresponding path program 9 times [2021-05-02 13:01:53,938 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:53,938 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985823682] [2021-05-02 13:01:53,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:53,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:54,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:54,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:54,074 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:01:54,074 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:54,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985823682] [2021-05-02 13:01:54,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [985823682] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:54,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366534954] [2021-05-02 13:01:54,075 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:54,175 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:01:54,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:54,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:01:54,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:54,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:54,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:54,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:01:54,296 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:01:54,296 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1366534954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:54,296 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:54,296 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7] total 19 [2021-05-02 13:01:54,296 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953586315] [2021-05-02 13:01:54,296 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:01:54,296 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:54,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:01:54,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:01:54,299 INFO L87 Difference]: Start difference. First operand 238 states and 320 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:56,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:01:56,740 INFO L93 Difference]: Finished difference Result 375 states and 518 transitions. [2021-05-02 13:01:56,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 13:01:56,740 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 13:01:56,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:01:56,741 INFO L225 Difference]: With dead ends: 375 [2021-05-02 13:01:56,741 INFO L226 Difference]: Without dead ends: 332 [2021-05-02 13:01:56,742 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1320 ImplicationChecksByTransitivity, 1637.7ms TimeCoverageRelationStatistics Valid=410, Invalid=4702, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 13:01:56,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2021-05-02 13:01:56,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 225. [2021-05-02 13:01:56,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 220 states have (on average 1.3545454545454545) internal successors, (298), 220 states have internal predecessors, (298), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:56,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 302 transitions. [2021-05-02 13:01:56,753 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 302 transitions. Word has length 31 [2021-05-02 13:01:56,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:01:56,753 INFO L480 AbstractCegarLoop]: Abstraction has 225 states and 302 transitions. [2021-05-02 13:01:56,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:01:56,753 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 302 transitions. [2021-05-02 13:01:56,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:01:56,753 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:01:56,753 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:01:56,967 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 13:01:56,967 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:01:56,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:01:56,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1558438816, now seen corresponding path program 5 times [2021-05-02 13:01:56,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:01:56,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088533320] [2021-05-02 13:01:56,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:01:56,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:57,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:01:57,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:01:57,119 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:01:57,119 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:01:57,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088533320] [2021-05-02 13:01:57,120 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2088533320] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:57,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865221138] [2021-05-02 13:01:57,120 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:01:57,286 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:01:57,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:01:57,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 13:01:57,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:01:57,429 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 5 proven. 25 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:01:57,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865221138] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:01:57,430 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:01:57,430 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 8] total 22 [2021-05-02 13:01:57,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540632056] [2021-05-02 13:01:57,430 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:01:57,430 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:01:57,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:01:57,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:01:57,431 INFO L87 Difference]: Start difference. First operand 225 states and 302 transitions. Second operand has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:00,728 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:02:00,886 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:02:03,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:03,530 INFO L93 Difference]: Finished difference Result 354 states and 506 transitions. [2021-05-02 13:02:03,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-05-02 13:02:03,530 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 13:02:03,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:03,531 INFO L225 Difference]: With dead ends: 354 [2021-05-02 13:02:03,531 INFO L226 Difference]: Without dead ends: 339 [2021-05-02 13:02:03,533 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2591 ImplicationChecksByTransitivity, 5035.2ms TimeCoverageRelationStatistics Valid=978, Invalid=7952, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 13:02:03,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2021-05-02 13:02:03,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 263. [2021-05-02 13:02:03,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 258 states have (on average 1.3488372093023255) internal successors, (348), 258 states have internal predecessors, (348), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:03,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 352 transitions. [2021-05-02 13:02:03,544 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 352 transitions. Word has length 31 [2021-05-02 13:02:03,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:03,544 INFO L480 AbstractCegarLoop]: Abstraction has 263 states and 352 transitions. [2021-05-02 13:02:03,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:03,544 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 352 transitions. [2021-05-02 13:02:03,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:02:03,544 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:03,545 INFO L523 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:03,745 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 13:02:03,745 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:03,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:03,745 INFO L82 PathProgramCache]: Analyzing trace with hash 300326575, now seen corresponding path program 15 times [2021-05-02 13:02:03,745 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:03,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [556072506] [2021-05-02 13:02:03,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:03,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:03,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:03,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:03,972 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:03,973 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:03,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [556072506] [2021-05-02 13:02:03,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [556072506] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:03,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908524450] [2021-05-02 13:02:03,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:04,087 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-05-02 13:02:04,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:04,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 13:02:04,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:04,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:04,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:04,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:04,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:04,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:04,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:04,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:04,173 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:04,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908524450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:04,173 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:04,173 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 13:02:04,173 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219389034] [2021-05-02 13:02:04,173 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 13:02:04,173 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:04,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 13:02:04,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:02:04,174 INFO L87 Difference]: Start difference. First operand 263 states and 352 transitions. Second operand has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:05,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:05,638 INFO L93 Difference]: Finished difference Result 565 states and 815 transitions. [2021-05-02 13:02:05,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:02:05,639 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 13:02:05,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:05,640 INFO L225 Difference]: With dead ends: 565 [2021-05-02 13:02:05,640 INFO L226 Difference]: Without dead ends: 536 [2021-05-02 13:02:05,640 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 628.2ms TimeCoverageRelationStatistics Valid=111, Invalid=1295, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:02:05,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2021-05-02 13:02:05,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 278. [2021-05-02 13:02:05,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 273 states have (on average 1.3553113553113554) internal successors, (370), 273 states have internal predecessors, (370), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:05,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 374 transitions. [2021-05-02 13:02:05,653 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 374 transitions. Word has length 31 [2021-05-02 13:02:05,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:05,653 INFO L480 AbstractCegarLoop]: Abstraction has 278 states and 374 transitions. [2021-05-02 13:02:05,653 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 20 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:05,653 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 374 transitions. [2021-05-02 13:02:05,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:02:05,653 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:05,654 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:05,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-02 13:02:05,862 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:05,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:05,862 INFO L82 PathProgramCache]: Analyzing trace with hash 904933634, now seen corresponding path program 10 times [2021-05-02 13:02:05,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:05,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730763245] [2021-05-02 13:02:05,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:05,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:05,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:05,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:05,990 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 13:02:05,990 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:05,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730763245] [2021-05-02 13:02:05,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730763245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:05,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387506191] [2021-05-02 13:02:05,990 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:06,031 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:02:06,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:06,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 13:02:06,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:06,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:06,088 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 13:02:06,089 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387506191] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:06,089 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:06,089 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 13:02:06,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582701969] [2021-05-02 13:02:06,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:02:06,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:06,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:02:06,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:02:06,090 INFO L87 Difference]: Start difference. First operand 278 states and 374 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:06,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:06,713 INFO L93 Difference]: Finished difference Result 395 states and 511 transitions. [2021-05-02 13:02:06,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 13:02:06,714 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 13:02:06,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:06,715 INFO L225 Difference]: With dead ends: 395 [2021-05-02 13:02:06,715 INFO L226 Difference]: Without dead ends: 379 [2021-05-02 13:02:06,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 426.3ms TimeCoverageRelationStatistics Valid=98, Invalid=604, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:02:06,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2021-05-02 13:02:06,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 278. [2021-05-02 13:02:06,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 273 states have (on average 1.3516483516483517) internal successors, (369), 273 states have internal predecessors, (369), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:06,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 373 transitions. [2021-05-02 13:02:06,727 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 373 transitions. Word has length 32 [2021-05-02 13:02:06,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:06,727 INFO L480 AbstractCegarLoop]: Abstraction has 278 states and 373 transitions. [2021-05-02 13:02:06,727 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:06,727 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 373 transitions. [2021-05-02 13:02:06,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:02:06,728 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:06,728 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:06,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-05-02 13:02:06,943 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:06,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:06,943 INFO L82 PathProgramCache]: Analyzing trace with hash 741226194, now seen corresponding path program 11 times [2021-05-02 13:02:06,943 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:06,943 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1998111433] [2021-05-02 13:02:06,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:06,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:07,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:07,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:07,087 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-05-02 13:02:07,087 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:07,087 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1998111433] [2021-05-02 13:02:07,087 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1998111433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:07,087 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091225257] [2021-05-02 13:02:07,087 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:07,712 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 13:02:07,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:07,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 13:02:07,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:07,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:07,809 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-05-02 13:02:07,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091225257] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:07,810 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:07,810 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 13:02:07,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38779592] [2021-05-02 13:02:07,810 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:02:07,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:07,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:02:07,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:02:07,811 INFO L87 Difference]: Start difference. First operand 278 states and 373 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:08,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:08,477 INFO L93 Difference]: Finished difference Result 420 states and 538 transitions. [2021-05-02 13:02:08,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:02:08,477 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 13:02:08,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:08,478 INFO L225 Difference]: With dead ends: 420 [2021-05-02 13:02:08,478 INFO L226 Difference]: Without dead ends: 404 [2021-05-02 13:02:08,479 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 425.9ms TimeCoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:02:08,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2021-05-02 13:02:08,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 278. [2021-05-02 13:02:08,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 273 states have (on average 1.347985347985348) internal successors, (368), 273 states have internal predecessors, (368), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:08,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 372 transitions. [2021-05-02 13:02:08,520 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 372 transitions. Word has length 32 [2021-05-02 13:02:08,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:08,522 INFO L480 AbstractCegarLoop]: Abstraction has 278 states and 372 transitions. [2021-05-02 13:02:08,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 13 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:08,522 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 372 transitions. [2021-05-02 13:02:08,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:02:08,522 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:08,522 INFO L523 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:08,726 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:08,726 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:08,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:08,726 INFO L82 PathProgramCache]: Analyzing trace with hash -1133720062, now seen corresponding path program 16 times [2021-05-02 13:02:08,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:08,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1674117180] [2021-05-02 13:02:08,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:08,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:09,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:09,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:09,031 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:09,031 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:09,031 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1674117180] [2021-05-02 13:02:09,031 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1674117180] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:09,031 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [152063244] [2021-05-02 13:02:09,031 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:09,074 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:02:09,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:09,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 13:02:09,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:09,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:09,173 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:09,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [152063244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:09,174 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:09,174 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 13:02:09,174 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851898950] [2021-05-02 13:02:09,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:02:09,175 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:09,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:02:09,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:02:09,175 INFO L87 Difference]: Start difference. First operand 278 states and 372 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:10,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:10,930 INFO L93 Difference]: Finished difference Result 596 states and 860 transitions. [2021-05-02 13:02:10,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:02:10,931 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 13:02:10,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:10,932 INFO L225 Difference]: With dead ends: 596 [2021-05-02 13:02:10,932 INFO L226 Difference]: Without dead ends: 567 [2021-05-02 13:02:10,933 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 768.2ms TimeCoverageRelationStatistics Valid=117, Invalid=1443, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:02:10,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2021-05-02 13:02:10,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 293. [2021-05-02 13:02:10,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 288 states have (on average 1.3541666666666667) internal successors, (390), 288 states have internal predecessors, (390), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:10,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 394 transitions. [2021-05-02 13:02:10,973 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 394 transitions. Word has length 32 [2021-05-02 13:02:10,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:10,973 INFO L480 AbstractCegarLoop]: Abstraction has 293 states and 394 transitions. [2021-05-02 13:02:10,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:10,973 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 394 transitions. [2021-05-02 13:02:10,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 13:02:10,974 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:10,974 INFO L523 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:11,188 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-05-02 13:02:11,189 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:11,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:11,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1655474447, now seen corresponding path program 17 times [2021-05-02 13:02:11,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:11,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375236653] [2021-05-02 13:02:11,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:11,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:11,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:11,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:11,506 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:11,506 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:11,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375236653] [2021-05-02 13:02:11,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375236653] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:11,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2041893209] [2021-05-02 13:02:11,506 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:12,834 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 13:02:12,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:12,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 13:02:12,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:12,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:12,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:12,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:12,940 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:12,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2041893209] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:12,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:12,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 13:02:12,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104250986] [2021-05-02 13:02:12,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 13:02:12,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:12,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 13:02:12,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:02:12,941 INFO L87 Difference]: Start difference. First operand 293 states and 394 transitions. Second operand has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 22 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:14,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:14,972 INFO L93 Difference]: Finished difference Result 627 states and 907 transitions. [2021-05-02 13:02:14,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:02:14,973 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 22 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 13:02:14,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:14,974 INFO L225 Difference]: With dead ends: 627 [2021-05-02 13:02:14,974 INFO L226 Difference]: Without dead ends: 598 [2021-05-02 13:02:14,975 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 847.4ms TimeCoverageRelationStatistics Valid=123, Invalid=1599, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:02:14,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 598 states. [2021-05-02 13:02:14,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 598 to 308. [2021-05-02 13:02:14,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 303 states have (on average 1.3597359735973598) internal successors, (412), 303 states have internal predecessors, (412), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:14,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 416 transitions. [2021-05-02 13:02:14,988 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 416 transitions. Word has length 33 [2021-05-02 13:02:14,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:14,988 INFO L480 AbstractCegarLoop]: Abstraction has 308 states and 416 transitions. [2021-05-02 13:02:14,988 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.391304347826087) internal successors, (32), 22 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:14,988 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 416 transitions. [2021-05-02 13:02:14,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:02:14,989 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:14,989 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:15,192 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:15,192 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:15,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:15,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1655978978, now seen corresponding path program 12 times [2021-05-02 13:02:15,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:15,193 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832679689] [2021-05-02 13:02:15,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:15,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:15,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:15,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:15,333 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 13:02:15,333 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:15,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832679689] [2021-05-02 13:02:15,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832679689] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:15,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253228182] [2021-05-02 13:02:15,333 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:15,421 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:02:15,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:15,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:02:15,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:15,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:15,483 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-05-02 13:02:15,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253228182] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:15,484 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:15,484 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 13:02:15,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033023906] [2021-05-02 13:02:15,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:02:15,484 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:15,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:02:15,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:02:15,484 INFO L87 Difference]: Start difference. First operand 308 states and 416 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:16,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:16,235 INFO L93 Difference]: Finished difference Result 415 states and 543 transitions. [2021-05-02 13:02:16,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:02:16,235 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:02:16,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:16,236 INFO L225 Difference]: With dead ends: 415 [2021-05-02 13:02:16,236 INFO L226 Difference]: Without dead ends: 398 [2021-05-02 13:02:16,237 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 512.7ms TimeCoverageRelationStatistics Valid=122, Invalid=808, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:02:16,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-05-02 13:02:16,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 308. [2021-05-02 13:02:16,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 303 states have (on average 1.3564356435643565) internal successors, (411), 303 states have internal predecessors, (411), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:16,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 415 transitions. [2021-05-02 13:02:16,249 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 415 transitions. Word has length 34 [2021-05-02 13:02:16,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:16,250 INFO L480 AbstractCegarLoop]: Abstraction has 308 states and 415 transitions. [2021-05-02 13:02:16,250 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:16,250 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 415 transitions. [2021-05-02 13:02:16,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:02:16,250 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:16,250 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:16,457 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 13:02:16,457 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:16,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:16,457 INFO L82 PathProgramCache]: Analyzing trace with hash 97640418, now seen corresponding path program 13 times [2021-05-02 13:02:16,457 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:16,457 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286331702] [2021-05-02 13:02:16,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:16,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:16,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:16,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:16,620 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 13:02:16,620 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:16,620 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286331702] [2021-05-02 13:02:16,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286331702] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:16,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1822090969] [2021-05-02 13:02:16,621 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:16,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:16,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 13:02:16,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:16,799 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 13:02:16,799 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1822090969] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:16,799 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:16,799 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 8] total 22 [2021-05-02 13:02:16,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658236910] [2021-05-02 13:02:16,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:02:16,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:16,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:02:16,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=416, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:02:16,800 INFO L87 Difference]: Start difference. First operand 308 states and 415 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:23,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:23,019 INFO L93 Difference]: Finished difference Result 527 states and 713 transitions. [2021-05-02 13:02:23,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-02 13:02:23,019 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:02:23,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:23,020 INFO L225 Difference]: With dead ends: 527 [2021-05-02 13:02:23,020 INFO L226 Difference]: Without dead ends: 494 [2021-05-02 13:02:23,023 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3397 ImplicationChecksByTransitivity, 5030.7ms TimeCoverageRelationStatistics Valid=1135, Invalid=9785, Unknown=0, NotChecked=0, Total=10920 [2021-05-02 13:02:23,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 494 states. [2021-05-02 13:02:23,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 494 to 311. [2021-05-02 13:02:23,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 306 states have (on average 1.34640522875817) internal successors, (412), 306 states have internal predecessors, (412), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:23,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 416 transitions. [2021-05-02 13:02:23,046 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 416 transitions. Word has length 34 [2021-05-02 13:02:23,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:23,046 INFO L480 AbstractCegarLoop]: Abstraction has 311 states and 416 transitions. [2021-05-02 13:02:23,046 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:23,046 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 416 transitions. [2021-05-02 13:02:23,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:02:23,047 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:23,047 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:23,248 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:23,249 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:23,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:23,249 INFO L82 PathProgramCache]: Analyzing trace with hash 1633078978, now seen corresponding path program 6 times [2021-05-02 13:02:23,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:23,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717678302] [2021-05-02 13:02:23,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:23,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:23,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:23,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:23,462 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:23,462 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:23,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717678302] [2021-05-02 13:02:23,463 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717678302] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:23,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758625715] [2021-05-02 13:02:23,463 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:23,541 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:02:23,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:23,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 13:02:23,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:23,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:23,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:23,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:23,614 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:23,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758625715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:23,615 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:23,615 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16] total 18 [2021-05-02 13:02:23,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748616911] [2021-05-02 13:02:23,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:02:23,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:23,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:02:23,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:02:23,615 INFO L87 Difference]: Start difference. First operand 311 states and 416 transitions. Second operand has 18 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 17 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:26,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:26,222 INFO L93 Difference]: Finished difference Result 441 states and 617 transitions. [2021-05-02 13:02:26,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 13:02:26,222 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 17 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:02:26,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:26,223 INFO L225 Difference]: With dead ends: 441 [2021-05-02 13:02:26,223 INFO L226 Difference]: Without dead ends: 426 [2021-05-02 13:02:26,224 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1906 ImplicationChecksByTransitivity, 1873.6ms TimeCoverageRelationStatistics Valid=441, Invalid=6039, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 13:02:26,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2021-05-02 13:02:26,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 320. [2021-05-02 13:02:26,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 320 states, 315 states have (on average 1.3365079365079364) internal successors, (421), 315 states have internal predecessors, (421), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:26,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 425 transitions. [2021-05-02 13:02:26,237 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 425 transitions. Word has length 34 [2021-05-02 13:02:26,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:26,238 INFO L480 AbstractCegarLoop]: Abstraction has 320 states and 425 transitions. [2021-05-02 13:02:26,238 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 17 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:26,238 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 425 transitions. [2021-05-02 13:02:26,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:02:26,238 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:26,238 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:26,449 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 13:02:26,449 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:26,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:26,449 INFO L82 PathProgramCache]: Analyzing trace with hash 1620223476, now seen corresponding path program 14 times [2021-05-02 13:02:26,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:26,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88634359] [2021-05-02 13:02:26,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:26,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:26,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:26,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:26,613 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-05-02 13:02:26,614 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:26,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88634359] [2021-05-02 13:02:26,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88634359] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:26,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603463403] [2021-05-02 13:02:26,614 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:26,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:02:26,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:26,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:02:26,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:26,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:26,714 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 31 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-05-02 13:02:26,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603463403] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:26,714 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:26,714 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 13:02:26,714 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108706443] [2021-05-02 13:02:26,714 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:02:26,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:26,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:02:26,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:02:26,715 INFO L87 Difference]: Start difference. First operand 320 states and 425 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:27,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:27,481 INFO L93 Difference]: Finished difference Result 474 states and 609 transitions. [2021-05-02 13:02:27,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:02:27,481 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:02:27,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:27,483 INFO L225 Difference]: With dead ends: 474 [2021-05-02 13:02:27,483 INFO L226 Difference]: Without dead ends: 457 [2021-05-02 13:02:27,483 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 494.5ms TimeCoverageRelationStatistics Valid=104, Invalid=708, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:02:27,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-05-02 13:02:27,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 320. [2021-05-02 13:02:27,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 320 states, 315 states have (on average 1.3333333333333333) internal successors, (420), 315 states have internal predecessors, (420), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:27,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 424 transitions. [2021-05-02 13:02:27,496 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 424 transitions. Word has length 34 [2021-05-02 13:02:27,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:27,497 INFO L480 AbstractCegarLoop]: Abstraction has 320 states and 424 transitions. [2021-05-02 13:02:27,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 14 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:27,497 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 424 transitions. [2021-05-02 13:02:27,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:02:27,497 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:27,497 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:27,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-02 13:02:27,713 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:27,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:27,713 INFO L82 PathProgramCache]: Analyzing trace with hash -1290423902, now seen corresponding path program 15 times [2021-05-02 13:02:27,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:27,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376637806] [2021-05-02 13:02:27,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:27,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:27,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:27,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:27,847 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-05-02 13:02:27,847 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:27,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376637806] [2021-05-02 13:02:27,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376637806] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:27,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714242402] [2021-05-02 13:02:27,847 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:27,889 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:02:27,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:27,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:02:27,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:27,978 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-05-02 13:02:27,978 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714242402] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:27,978 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:27,978 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 6] total 18 [2021-05-02 13:02:27,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615160277] [2021-05-02 13:02:27,979 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:02:27,979 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:27,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:02:27,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=270, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:02:27,979 INFO L87 Difference]: Start difference. First operand 320 states and 424 transitions. Second operand has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:29,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:29,270 INFO L93 Difference]: Finished difference Result 536 states and 681 transitions. [2021-05-02 13:02:29,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:02:29,271 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:02:29,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:29,272 INFO L225 Difference]: With dead ends: 536 [2021-05-02 13:02:29,272 INFO L226 Difference]: Without dead ends: 489 [2021-05-02 13:02:29,272 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 818.5ms TimeCoverageRelationStatistics Valid=180, Invalid=1626, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:02:29,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-05-02 13:02:29,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 301. [2021-05-02 13:02:29,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 296 states have (on average 1.3074324324324325) internal successors, (387), 296 states have internal predecessors, (387), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:29,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 391 transitions. [2021-05-02 13:02:29,289 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 391 transitions. Word has length 34 [2021-05-02 13:02:29,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:29,289 INFO L480 AbstractCegarLoop]: Abstraction has 301 states and 391 transitions. [2021-05-02 13:02:29,290 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.7777777777777777) internal successors, (32), 17 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:29,290 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 391 transitions. [2021-05-02 13:02:29,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 13:02:29,290 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:29,290 INFO L523 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:29,505 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 13:02:29,505 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:29,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:29,505 INFO L82 PathProgramCache]: Analyzing trace with hash -2073808990, now seen corresponding path program 18 times [2021-05-02 13:02:29,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:29,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76041017] [2021-05-02 13:02:29,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:29,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:29,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:29,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:29,829 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:29,829 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:29,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76041017] [2021-05-02 13:02:29,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76041017] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:29,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [29814473] [2021-05-02 13:02:29,829 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:30,323 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-05-02 13:02:30,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:30,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 13:02:30,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:30,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:30,501 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:30,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [29814473] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:30,501 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:30,501 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 27 [2021-05-02 13:02:30,501 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456670578] [2021-05-02 13:02:30,502 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:02:30,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:30,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:02:30,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=647, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:02:30,502 INFO L87 Difference]: Start difference. First operand 301 states and 391 transitions. Second operand has 27 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 26 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:32,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:32,822 INFO L93 Difference]: Finished difference Result 685 states and 962 transitions. [2021-05-02 13:02:32,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:02:32,822 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 26 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2021-05-02 13:02:32,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:32,823 INFO L225 Difference]: With dead ends: 685 [2021-05-02 13:02:32,824 INFO L226 Difference]: Without dead ends: 654 [2021-05-02 13:02:32,824 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 1005.1ms TimeCoverageRelationStatistics Valid=158, Invalid=2292, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:02:32,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-05-02 13:02:32,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 315. [2021-05-02 13:02:32,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 310 states have (on average 1.3129032258064517) internal successors, (407), 310 states have internal predecessors, (407), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:32,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 411 transitions. [2021-05-02 13:02:32,839 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 411 transitions. Word has length 34 [2021-05-02 13:02:32,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:32,839 INFO L480 AbstractCegarLoop]: Abstraction has 315 states and 411 transitions. [2021-05-02 13:02:32,839 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 26 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:32,839 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 411 transitions. [2021-05-02 13:02:32,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 13:02:32,839 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:32,839 INFO L523 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:33,040 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2021-05-02 13:02:33,040 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:33,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:33,040 INFO L82 PathProgramCache]: Analyzing trace with hash -1717478545, now seen corresponding path program 19 times [2021-05-02 13:02:33,040 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:33,040 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2028388742] [2021-05-02 13:02:33,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:33,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:33,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:33,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:33,351 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:33,351 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:33,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2028388742] [2021-05-02 13:02:33,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2028388742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:33,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2086594526] [2021-05-02 13:02:33,351 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:33,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:33,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 13:02:33,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:33,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:33,475 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:33,475 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2086594526] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:33,475 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:33,475 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 13:02:33,476 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892706213] [2021-05-02 13:02:33,476 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:02:33,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:33,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:02:33,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:02:33,476 INFO L87 Difference]: Start difference. First operand 315 states and 411 transitions. Second operand has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:35,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:35,789 INFO L93 Difference]: Finished difference Result 707 states and 996 transitions. [2021-05-02 13:02:35,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:02:35,790 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 13:02:35,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:35,791 INFO L225 Difference]: With dead ends: 707 [2021-05-02 13:02:35,791 INFO L226 Difference]: Without dead ends: 676 [2021-05-02 13:02:35,791 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 865.9ms TimeCoverageRelationStatistics Valid=135, Invalid=1935, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:02:35,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 676 states. [2021-05-02 13:02:35,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 676 to 329. [2021-05-02 13:02:35,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 324 states have (on average 1.3179012345679013) internal successors, (427), 324 states have internal predecessors, (427), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:35,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 431 transitions. [2021-05-02 13:02:35,807 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 431 transitions. Word has length 35 [2021-05-02 13:02:35,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:35,807 INFO L480 AbstractCegarLoop]: Abstraction has 329 states and 431 transitions. [2021-05-02 13:02:35,807 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.36) internal successors, (34), 24 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:35,807 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 431 transitions. [2021-05-02 13:02:35,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 13:02:35,808 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:35,808 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:36,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:36,021 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:36,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:36,021 INFO L82 PathProgramCache]: Analyzing trace with hash 955015874, now seen corresponding path program 8 times [2021-05-02 13:02:36,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:36,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464086127] [2021-05-02 13:02:36,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:36,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:36,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:36,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:36,351 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 13:02:36,351 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:36,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464086127] [2021-05-02 13:02:36,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464086127] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:36,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [554003313] [2021-05-02 13:02:36,351 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:36,406 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:02:36,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:36,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 13:02:36,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:36,618 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 13:02:36,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [554003313] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:36,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:36,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 9] total 21 [2021-05-02 13:02:36,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997805631] [2021-05-02 13:02:36,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 13:02:36,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:36,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 13:02:36,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=366, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:02:36,619 INFO L87 Difference]: Start difference. First operand 329 states and 431 transitions. Second operand has 21 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:37,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:37,165 INFO L93 Difference]: Finished difference Result 339 states and 440 transitions. [2021-05-02 13:02:37,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:02:37,165 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 13:02:37,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:37,166 INFO L225 Difference]: With dead ends: 339 [2021-05-02 13:02:37,166 INFO L226 Difference]: Without dead ends: 313 [2021-05-02 13:02:37,166 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 31 SyntacticMatches, 8 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 732.2ms TimeCoverageRelationStatistics Valid=120, Invalid=872, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:02:37,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 313 states. [2021-05-02 13:02:37,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 313 to 313. [2021-05-02 13:02:37,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 308 states have (on average 1.3311688311688312) internal successors, (410), 308 states have internal predecessors, (410), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:37,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 414 transitions. [2021-05-02 13:02:37,181 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 414 transitions. Word has length 36 [2021-05-02 13:02:37,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:37,181 INFO L480 AbstractCegarLoop]: Abstraction has 313 states and 414 transitions. [2021-05-02 13:02:37,181 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:37,181 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 414 transitions. [2021-05-02 13:02:37,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 13:02:37,182 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:37,182 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:37,382 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,49 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:37,382 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:37,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:37,382 INFO L82 PathProgramCache]: Analyzing trace with hash -1644820974, now seen corresponding path program 16 times [2021-05-02 13:02:37,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:37,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975677237] [2021-05-02 13:02:37,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:37,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:37,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:37,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:37,538 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-05-02 13:02:37,538 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:37,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975677237] [2021-05-02 13:02:37,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975677237] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:37,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217105450] [2021-05-02 13:02:37,538 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:37,577 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:02:37,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:37,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:02:37,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:37,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:37,638 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-05-02 13:02:37,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217105450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:37,638 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:37,638 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 13:02:37,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891472023] [2021-05-02 13:02:37,638 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:02:37,639 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:37,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:02:37,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=207, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:02:37,639 INFO L87 Difference]: Start difference. First operand 313 states and 414 transitions. Second operand has 16 states, 16 states have (on average 1.6875) internal successors, (27), 15 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:38,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:38,489 INFO L93 Difference]: Finished difference Result 456 states and 587 transitions. [2021-05-02 13:02:38,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:02:38,489 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.6875) internal successors, (27), 15 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 13:02:38,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:38,491 INFO L225 Difference]: With dead ends: 456 [2021-05-02 13:02:38,491 INFO L226 Difference]: Without dead ends: 438 [2021-05-02 13:02:38,491 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 543.9ms TimeCoverageRelationStatistics Valid=128, Invalid=928, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:02:38,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2021-05-02 13:02:38,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 313. [2021-05-02 13:02:38,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 308 states have (on average 1.327922077922078) internal successors, (409), 308 states have internal predecessors, (409), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:38,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 413 transitions. [2021-05-02 13:02:38,505 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 413 transitions. Word has length 36 [2021-05-02 13:02:38,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:38,506 INFO L480 AbstractCegarLoop]: Abstraction has 313 states and 413 transitions. [2021-05-02 13:02:38,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.6875) internal successors, (27), 15 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:38,506 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 413 transitions. [2021-05-02 13:02:38,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 13:02:38,506 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:38,506 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:38,706 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-05-02 13:02:38,707 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:38,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:38,707 INFO L82 PathProgramCache]: Analyzing trace with hash -777486412, now seen corresponding path program 7 times [2021-05-02 13:02:38,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:38,707 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [353886397] [2021-05-02 13:02:38,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:38,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:38,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:38,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:38,912 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 13:02:38,912 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:38,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [353886397] [2021-05-02 13:02:38,913 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [353886397] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:38,913 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1318825386] [2021-05-02 13:02:38,913 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:38,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:38,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:02:38,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:39,134 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 12 proven. 36 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-05-02 13:02:39,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1318825386] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:39,134 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:39,134 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9] total 25 [2021-05-02 13:02:39,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977962986] [2021-05-02 13:02:39,134 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:02:39,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:39,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:02:39,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=547, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:02:39,135 INFO L87 Difference]: Start difference. First operand 313 states and 413 transitions. Second operand has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:39,754 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:40,047 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:40,275 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:40,508 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:02:40,702 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:02:40,969 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:41,563 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:02:41,808 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:02:42,081 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:02:42,304 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:02:42,859 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:02:44,862 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:45,229 WARN L205 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:02:45,484 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:02:46,274 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:02:47,646 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:02:48,721 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:02:48,977 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:02:49,597 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:02:50,071 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:02:50,789 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:02:52,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:52,669 INFO L93 Difference]: Finished difference Result 677 states and 901 transitions. [2021-05-02 13:02:52,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-05-02 13:02:52,670 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 13:02:52,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:52,671 INFO L225 Difference]: With dead ends: 677 [2021-05-02 13:02:52,671 INFO L226 Difference]: Without dead ends: 632 [2021-05-02 13:02:52,672 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5239 ImplicationChecksByTransitivity, 11093.3ms TimeCoverageRelationStatistics Valid=1698, Invalid=14558, Unknown=0, NotChecked=0, Total=16256 [2021-05-02 13:02:52,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 632 states. [2021-05-02 13:02:52,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 632 to 350. [2021-05-02 13:02:52,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 345 states have (on average 1.3304347826086957) internal successors, (459), 345 states have internal predecessors, (459), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:52,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 463 transitions. [2021-05-02 13:02:52,690 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 463 transitions. Word has length 36 [2021-05-02 13:02:52,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:52,690 INFO L480 AbstractCegarLoop]: Abstraction has 350 states and 463 transitions. [2021-05-02 13:02:52,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.88) internal successors, (47), 24 states have internal predecessors, (47), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:52,690 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 463 transitions. [2021-05-02 13:02:52,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 13:02:52,691 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:52,691 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:52,897 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:52,897 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:52,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:52,897 INFO L82 PathProgramCache]: Analyzing trace with hash -84969854, now seen corresponding path program 17 times [2021-05-02 13:02:52,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:52,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056129904] [2021-05-02 13:02:52,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:52,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:53,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:53,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:53,055 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-05-02 13:02:53,055 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:53,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056129904] [2021-05-02 13:02:53,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056129904] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:53,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348847764] [2021-05-02 13:02:53,055 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:53,373 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 13:02:53,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:53,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 13:02:53,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:53,495 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-05-02 13:02:53,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [348847764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:53,495 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:53,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 18 [2021-05-02 13:02:53,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796340847] [2021-05-02 13:02:53,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:02:53,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:53,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:02:53,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:02:53,496 INFO L87 Difference]: Start difference. First operand 350 states and 463 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:54,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:54,464 INFO L93 Difference]: Finished difference Result 523 states and 669 transitions. [2021-05-02 13:02:54,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:02:54,464 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 13:02:54,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:54,466 INFO L225 Difference]: With dead ends: 523 [2021-05-02 13:02:54,466 INFO L226 Difference]: Without dead ends: 505 [2021-05-02 13:02:54,466 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 573.2ms TimeCoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:02:54,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-05-02 13:02:54,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 350. [2021-05-02 13:02:54,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 345 states have (on average 1.327536231884058) internal successors, (458), 345 states have internal predecessors, (458), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:54,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 462 transitions. [2021-05-02 13:02:54,483 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 462 transitions. Word has length 36 [2021-05-02 13:02:54,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:54,483 INFO L480 AbstractCegarLoop]: Abstraction has 350 states and 462 transitions. [2021-05-02 13:02:54,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:54,483 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 462 transitions. [2021-05-02 13:02:54,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 13:02:54,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:54,484 INFO L523 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:54,686 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-02 13:02:54,687 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:54,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:54,687 INFO L82 PathProgramCache]: Analyzing trace with hash 738830658, now seen corresponding path program 20 times [2021-05-02 13:02:54,687 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:54,687 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224286722] [2021-05-02 13:02:54,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:54,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:55,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:55,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:55,049 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:55,049 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:55,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224286722] [2021-05-02 13:02:55,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224286722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:55,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107747082] [2021-05-02 13:02:55,049 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:55,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:02:55,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:55,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 13:02:55,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:55,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:02:55,195 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:55,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2107747082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:55,195 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:55,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 13:02:55,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107158731] [2021-05-02 13:02:55,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:02:55,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:55,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:02:55,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=600, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:02:55,196 INFO L87 Difference]: Start difference. First operand 350 states and 462 transitions. Second operand has 26 states, 26 states have (on average 1.3461538461538463) internal successors, (35), 25 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:57,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:02:57,944 INFO L93 Difference]: Finished difference Result 775 states and 1111 transitions. [2021-05-02 13:02:57,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 13:02:57,945 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.3461538461538463) internal successors, (35), 25 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-05-02 13:02:57,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:02:57,947 INFO L225 Difference]: With dead ends: 775 [2021-05-02 13:02:57,947 INFO L226 Difference]: Without dead ends: 743 [2021-05-02 13:02:57,947 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 976.5ms TimeCoverageRelationStatistics Valid=141, Invalid=2115, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:02:57,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 743 states. [2021-05-02 13:02:57,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 743 to 366. [2021-05-02 13:02:57,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 366 states, 361 states have (on average 1.332409972299169) internal successors, (481), 361 states have internal predecessors, (481), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:57,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 485 transitions. [2021-05-02 13:02:57,965 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 485 transitions. Word has length 36 [2021-05-02 13:02:57,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:02:57,966 INFO L480 AbstractCegarLoop]: Abstraction has 366 states and 485 transitions. [2021-05-02 13:02:57,966 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.3461538461538463) internal successors, (35), 25 states have internal predecessors, (35), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:57,966 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 485 transitions. [2021-05-02 13:02:57,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 13:02:57,966 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:02:57,966 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:02:58,176 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-05-02 13:02:58,176 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:02:58,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:02:58,176 INFO L82 PathProgramCache]: Analyzing trace with hash 203683232, now seen corresponding path program 8 times [2021-05-02 13:02:58,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:02:58,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1354289184] [2021-05-02 13:02:58,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:02:58,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:58,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:02:58,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:02:58,481 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:02:58,482 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:02:58,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1354289184] [2021-05-02 13:02:58,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1354289184] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:58,482 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235914702] [2021-05-02 13:02:58,482 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:02:58,523 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:02:58,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:02:58,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 13:02:58,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:02:58,790 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 7 proven. 49 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 13:02:58,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235914702] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:02:58,790 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:02:58,791 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10] total 28 [2021-05-02 13:02:58,791 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327612933] [2021-05-02 13:02:58,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:02:58,791 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:02:58,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:02:58,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=702, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:02:58,791 INFO L87 Difference]: Start difference. First operand 366 states and 485 transitions. Second operand has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:02:59,832 WARN L205 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:00,158 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:03:00,685 WARN L205 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:01,104 WARN L205 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:01,531 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:01,912 WARN L205 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:02,421 WARN L205 SmtUtils]: Spent 383.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:02,902 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:03,186 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:03,700 WARN L205 SmtUtils]: Spent 372.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:04,142 WARN L205 SmtUtils]: Spent 263.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:04,665 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:03:05,185 WARN L205 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:03:05,536 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:03:05,793 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:03:06,154 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:03:09,671 WARN L205 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:10,477 WARN L205 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:10,870 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:11,199 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:03:11,580 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:12,045 WARN L205 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:12,580 WARN L205 SmtUtils]: Spent 323.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:13,143 WARN L205 SmtUtils]: Spent 358.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:14,013 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:14,744 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:15,376 WARN L205 SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:15,786 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:16,369 WARN L205 SmtUtils]: Spent 300.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:16,767 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:03:17,593 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:18,136 WARN L205 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:18,441 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:18,955 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:19,379 WARN L205 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:20,655 WARN L205 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:21,126 WARN L205 SmtUtils]: Spent 273.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:21,606 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:22,216 WARN L205 SmtUtils]: Spent 377.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:22,733 WARN L205 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:23,023 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:03:23,650 WARN L205 SmtUtils]: Spent 487.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:24,453 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:03:24,888 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:03:25,534 WARN L205 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:26,062 WARN L205 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:26,513 WARN L205 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:27,077 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:27,543 WARN L205 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:28,377 WARN L205 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:03:28,764 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:03:29,197 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:03:29,569 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:30,060 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:30,635 WARN L205 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:30,977 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:31,492 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:32,111 WARN L205 SmtUtils]: Spent 382.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:32,771 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:03:33,077 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:03:33,524 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:03:33,840 WARN L205 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:34,404 WARN L205 SmtUtils]: Spent 317.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:34,891 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:35,439 WARN L205 SmtUtils]: Spent 305.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:35,872 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:36,066 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:03:37,388 WARN L205 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:03:37,685 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:03:37,982 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:38,530 WARN L205 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:38,980 WARN L205 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:39,300 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:40,026 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:03:40,498 WARN L205 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:03:40,908 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:03:41,222 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:41,827 WARN L205 SmtUtils]: Spent 300.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:42,450 WARN L205 SmtUtils]: Spent 480.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:03:42,919 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:03:43,198 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:03:43,707 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:03:44,064 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:03:44,524 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:03:45,091 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:03:45,535 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:03:45,995 WARN L205 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:03:46,305 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:03:47,105 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:03:47,821 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:03:48,696 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:03:49,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:03:49,638 INFO L93 Difference]: Finished difference Result 668 states and 915 transitions. [2021-05-02 13:03:49,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 219 states. [2021-05-02 13:03:49,639 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 13:03:49,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:03:49,640 INFO L225 Difference]: With dead ends: 668 [2021-05-02 13:03:49,640 INFO L226 Difference]: Without dead ends: 651 [2021-05-02 13:03:49,642 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 242 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23143 ImplicationChecksByTransitivity, 45903.3ms TimeCoverageRelationStatistics Valid=4026, Invalid=55266, Unknown=0, NotChecked=0, Total=59292 [2021-05-02 13:03:49,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 651 states. [2021-05-02 13:03:49,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 651 to 391. [2021-05-02 13:03:49,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 386 states have (on average 1.3471502590673574) internal successors, (520), 386 states have internal predecessors, (520), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:49,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 524 transitions. [2021-05-02 13:03:49,661 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 524 transitions. Word has length 37 [2021-05-02 13:03:49,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:03:49,662 INFO L480 AbstractCegarLoop]: Abstraction has 391 states and 524 transitions. [2021-05-02 13:03:49,662 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:49,662 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 524 transitions. [2021-05-02 13:03:49,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 13:03:49,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:03:49,662 INFO L523 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:03:49,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 13:03:49,863 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:03:49,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:03:49,863 INFO L82 PathProgramCache]: Analyzing trace with hash -424995377, now seen corresponding path program 21 times [2021-05-02 13:03:49,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:03:49,863 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819483136] [2021-05-02 13:03:49,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:03:49,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:50,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:03:50,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:50,331 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:03:50,331 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:03:50,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819483136] [2021-05-02 13:03:50,332 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819483136] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:50,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801377263] [2021-05-02 13:03:50,332 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:51,407 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-05-02 13:03:51,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:03:51,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 13:03:51,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:03:51,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:51,584 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:03:51,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801377263] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:51,584 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:03:51,584 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 28 [2021-05-02 13:03:51,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032238282] [2021-05-02 13:03:51,584 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:03:51,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:03:51,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:03:51,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:03:51,585 INFO L87 Difference]: Start difference. First operand 391 states and 524 transitions. Second operand has 28 states, 28 states have (on average 1.4642857142857142) internal successors, (41), 27 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:55,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:03:55,348 INFO L93 Difference]: Finished difference Result 881 states and 1271 transitions. [2021-05-02 13:03:55,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:03:55,349 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.4642857142857142) internal successors, (41), 27 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 13:03:55,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:03:55,350 INFO L225 Difference]: With dead ends: 881 [2021-05-02 13:03:55,351 INFO L226 Difference]: Without dead ends: 849 [2021-05-02 13:03:55,351 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 1310.9ms TimeCoverageRelationStatistics Valid=156, Invalid=2496, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:03:55,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 849 states. [2021-05-02 13:03:55,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 849 to 408. [2021-05-02 13:03:55,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 408 states, 403 states have (on average 1.3523573200992556) internal successors, (545), 403 states have internal predecessors, (545), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:55,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 549 transitions. [2021-05-02 13:03:55,372 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 549 transitions. Word has length 37 [2021-05-02 13:03:55,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:03:55,372 INFO L480 AbstractCegarLoop]: Abstraction has 408 states and 549 transitions. [2021-05-02 13:03:55,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.4642857142857142) internal successors, (41), 27 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:55,372 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 549 transitions. [2021-05-02 13:03:55,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:03:55,372 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:03:55,373 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:03:55,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-05-02 13:03:55,573 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:03:55,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:03:55,573 INFO L82 PathProgramCache]: Analyzing trace with hash 1151822627, now seen corresponding path program 9 times [2021-05-02 13:03:55,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:03:55,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575993420] [2021-05-02 13:03:55,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:03:55,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:55,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:03:55,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:55,746 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 15 proven. 18 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-05-02 13:03:55,746 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:03:55,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575993420] [2021-05-02 13:03:55,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575993420] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:55,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860077926] [2021-05-02 13:03:55,747 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:55,859 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 13:03:55,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:03:55,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:03:55,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:03:56,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:56,015 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 9 proven. 21 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-05-02 13:03:56,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860077926] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:56,015 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:03:56,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 19 [2021-05-02 13:03:56,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064731719] [2021-05-02 13:03:56,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:03:56,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:03:56,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:03:56,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:03:56,016 INFO L87 Difference]: Start difference. First operand 408 states and 549 transitions. Second operand has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:57,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:03:57,258 INFO L93 Difference]: Finished difference Result 516 states and 700 transitions. [2021-05-02 13:03:57,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:03:57,259 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 13:03:57,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:03:57,260 INFO L225 Difference]: With dead ends: 516 [2021-05-02 13:03:57,260 INFO L226 Difference]: Without dead ends: 502 [2021-05-02 13:03:57,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 934.9ms TimeCoverageRelationStatistics Valid=297, Invalid=1035, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:03:57,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2021-05-02 13:03:57,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 449. [2021-05-02 13:03:57,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 444 states have (on average 1.3310810810810811) internal successors, (591), 444 states have internal predecessors, (591), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:57,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 595 transitions. [2021-05-02 13:03:57,281 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 595 transitions. Word has length 38 [2021-05-02 13:03:57,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:03:57,281 INFO L480 AbstractCegarLoop]: Abstraction has 449 states and 595 transitions. [2021-05-02 13:03:57,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:57,282 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 595 transitions. [2021-05-02 13:03:57,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:03:57,282 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:03:57,282 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:03:57,482 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-02 13:03:57,483 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:03:57,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:03:57,483 INFO L82 PathProgramCache]: Analyzing trace with hash -770615006, now seen corresponding path program 18 times [2021-05-02 13:03:57,483 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:03:57,483 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148620192] [2021-05-02 13:03:57,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:03:57,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:57,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:03:57,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:57,712 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:03:57,712 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:03:57,712 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148620192] [2021-05-02 13:03:57,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148620192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:57,712 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144786436] [2021-05-02 13:03:57,712 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:57,824 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 13:03:57,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:03:57,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:03:57,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:03:57,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:57,923 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:03:57,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [144786436] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:57,924 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:03:57,924 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 13:03:57,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661009178] [2021-05-02 13:03:57,924 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:03:57,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:03:57,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:03:57,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:03:57,924 INFO L87 Difference]: Start difference. First operand 449 states and 595 transitions. Second operand has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 16 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:59,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:03:59,258 INFO L93 Difference]: Finished difference Result 627 states and 808 transitions. [2021-05-02 13:03:59,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:03:59,259 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 16 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 13:03:59,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:03:59,261 INFO L225 Difference]: With dead ends: 627 [2021-05-02 13:03:59,261 INFO L226 Difference]: Without dead ends: 608 [2021-05-02 13:03:59,261 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 800.9ms TimeCoverageRelationStatistics Valid=141, Invalid=1119, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:03:59,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 608 states. [2021-05-02 13:03:59,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 608 to 449. [2021-05-02 13:03:59,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 444 states have (on average 1.3288288288288288) internal successors, (590), 444 states have internal predecessors, (590), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:59,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 594 transitions. [2021-05-02 13:03:59,282 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 594 transitions. Word has length 38 [2021-05-02 13:03:59,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:03:59,283 INFO L480 AbstractCegarLoop]: Abstraction has 449 states and 594 transitions. [2021-05-02 13:03:59,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 16 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:03:59,283 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 594 transitions. [2021-05-02 13:03:59,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:03:59,283 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:03:59,283 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:03:59,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,57 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:59,484 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:03:59,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:03:59,484 INFO L82 PathProgramCache]: Analyzing trace with hash -1286566156, now seen corresponding path program 19 times [2021-05-02 13:03:59,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:03:59,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [79094000] [2021-05-02 13:03:59,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:03:59,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:59,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:03:59,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:59,717 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-05-02 13:03:59,718 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:03:59,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [79094000] [2021-05-02 13:03:59,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [79094000] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:59,718 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791198429] [2021-05-02 13:03:59,718 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:03:59,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:03:59,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 13:03:59,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:03:59,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:03:59,847 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-05-02 13:03:59,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [791198429] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:03:59,847 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:03:59,847 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 13:03:59,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875117857] [2021-05-02 13:03:59,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:03:59,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:03:59,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:03:59,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=238, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:03:59,848 INFO L87 Difference]: Start difference. First operand 449 states and 594 transitions. Second operand has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 16 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:01,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:01,090 INFO L93 Difference]: Finished difference Result 660 states and 845 transitions. [2021-05-02 13:04:01,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:04:01,091 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 16 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 13:04:01,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:01,092 INFO L225 Difference]: With dead ends: 660 [2021-05-02 13:04:01,092 INFO L226 Difference]: Without dead ends: 641 [2021-05-02 13:04:01,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 686.6ms TimeCoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:04:01,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2021-05-02 13:04:01,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 449. [2021-05-02 13:04:01,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 444 states have (on average 1.3265765765765767) internal successors, (589), 444 states have internal predecessors, (589), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:01,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 593 transitions. [2021-05-02 13:04:01,121 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 593 transitions. Word has length 38 [2021-05-02 13:04:01,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:01,121 INFO L480 AbstractCegarLoop]: Abstraction has 449 states and 593 transitions. [2021-05-02 13:04:01,121 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 16 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:01,121 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 593 transitions. [2021-05-02 13:04:01,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:04:01,122 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:01,122 INFO L523 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:01,341 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:01,341 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:01,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:01,341 INFO L82 PathProgramCache]: Analyzing trace with hash -2143864094, now seen corresponding path program 22 times [2021-05-02 13:04:01,341 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:01,341 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996340336] [2021-05-02 13:04:01,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:01,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:01,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:01,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:01,815 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:01,815 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:01,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996340336] [2021-05-02 13:04:01,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996340336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:01,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [319235413] [2021-05-02 13:04:01,815 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:01,856 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:04:01,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:01,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 13:04:01,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:01,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:01,979 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:01,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [319235413] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:01,980 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:01,980 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 13:04:01,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263193058] [2021-05-02 13:04:01,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:04:01,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:01,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:04:01,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=702, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:04:01,980 INFO L87 Difference]: Start difference. First operand 449 states and 593 transitions. Second operand has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 27 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:05,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:05,845 INFO L93 Difference]: Finished difference Result 981 states and 1412 transitions. [2021-05-02 13:04:05,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:04:05,845 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 27 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 13:04:05,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:05,848 INFO L225 Difference]: With dead ends: 981 [2021-05-02 13:04:05,848 INFO L226 Difference]: Without dead ends: 938 [2021-05-02 13:04:05,848 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 1355.0ms TimeCoverageRelationStatistics Valid=153, Invalid=2499, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:04:05,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 938 states. [2021-05-02 13:04:05,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 938 to 467. [2021-05-02 13:04:05,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 462 states have (on average 1.3311688311688312) internal successors, (615), 462 states have internal predecessors, (615), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:05,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 619 transitions. [2021-05-02 13:04:05,872 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 619 transitions. Word has length 38 [2021-05-02 13:04:05,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:05,872 INFO L480 AbstractCegarLoop]: Abstraction has 467 states and 619 transitions. [2021-05-02 13:04:05,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 27 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:05,872 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 619 transitions. [2021-05-02 13:04:05,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 13:04:05,873 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:05,873 INFO L523 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:06,074 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2021-05-02 13:04:06,074 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:06,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:06,074 INFO L82 PathProgramCache]: Analyzing trace with hash 405780527, now seen corresponding path program 23 times [2021-05-02 13:04:06,074 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:06,075 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479174061] [2021-05-02 13:04:06,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:06,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:06,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:06,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:06,607 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:06,607 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:06,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479174061] [2021-05-02 13:04:06,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479174061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:06,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1987669528] [2021-05-02 13:04:06,607 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:08,701 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 13:04:08,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:08,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 13:04:08,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:08,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:08,799 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:08,799 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1987669528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:08,799 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:08,799 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 26] total 28 [2021-05-02 13:04:08,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28731197] [2021-05-02 13:04:08,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:04:08,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:08,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:04:08,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:04:08,800 INFO L87 Difference]: Start difference. First operand 467 states and 619 transitions. Second operand has 28 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 27 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:12,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:12,945 INFO L93 Difference]: Finished difference Result 1020 states and 1471 transitions. [2021-05-02 13:04:12,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:04:12,945 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 27 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 13:04:12,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:12,948 INFO L225 Difference]: With dead ends: 1020 [2021-05-02 13:04:12,948 INFO L226 Difference]: Without dead ends: 977 [2021-05-02 13:04:12,948 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 1379.0ms TimeCoverageRelationStatistics Valid=155, Invalid=2601, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 13:04:12,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 977 states. [2021-05-02 13:04:12,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 977 to 485. [2021-05-02 13:04:12,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 480 states have (on average 1.3354166666666667) internal successors, (641), 480 states have internal predecessors, (641), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:12,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 645 transitions. [2021-05-02 13:04:12,976 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 645 transitions. Word has length 39 [2021-05-02 13:04:12,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:12,976 INFO L480 AbstractCegarLoop]: Abstraction has 485 states and 645 transitions. [2021-05-02 13:04:12,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.3928571428571428) internal successors, (39), 27 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:12,976 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 645 transitions. [2021-05-02 13:04:12,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:04:12,977 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:12,977 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:13,181 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:13,181 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:13,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:13,183 INFO L82 PathProgramCache]: Analyzing trace with hash 509212162, now seen corresponding path program 20 times [2021-05-02 13:04:13,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:13,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398136911] [2021-05-02 13:04:13,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:13,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:13,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:13,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:13,425 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-05-02 13:04:13,426 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:13,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398136911] [2021-05-02 13:04:13,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398136911] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:13,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101056319] [2021-05-02 13:04:13,426 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:13,467 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:04:13,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:13,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 13:04:13,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:13,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:13,675 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 82 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-05-02 13:04:13,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101056319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:13,676 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:13,676 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 20] total 22 [2021-05-02 13:04:13,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244165855] [2021-05-02 13:04:13,676 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:04:13,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:13,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:04:13,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=412, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:04:13,677 INFO L87 Difference]: Start difference. First operand 485 states and 645 transitions. Second operand has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:15,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:15,448 INFO L93 Difference]: Finished difference Result 650 states and 845 transitions. [2021-05-02 13:04:15,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:04:15,449 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 13:04:15,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:15,450 INFO L225 Difference]: With dead ends: 650 [2021-05-02 13:04:15,450 INFO L226 Difference]: Without dead ends: 630 [2021-05-02 13:04:15,456 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 1080.2ms TimeCoverageRelationStatistics Valid=184, Invalid=1796, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:04:15,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 630 states. [2021-05-02 13:04:15,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 630 to 485. [2021-05-02 13:04:15,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 480 states have (on average 1.3333333333333333) internal successors, (640), 480 states have internal predecessors, (640), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:15,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 644 transitions. [2021-05-02 13:04:15,484 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 644 transitions. Word has length 40 [2021-05-02 13:04:15,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:15,484 INFO L480 AbstractCegarLoop]: Abstraction has 485 states and 644 transitions. [2021-05-02 13:04:15,484 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:15,484 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 644 transitions. [2021-05-02 13:04:15,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:04:15,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:15,485 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:15,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable64 [2021-05-02 13:04:15,688 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:15,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:15,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1851265310, now seen corresponding path program 21 times [2021-05-02 13:04:15,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:15,689 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807146887] [2021-05-02 13:04:15,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:15,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:16,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:16,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:16,023 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-05-02 13:04:16,023 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:16,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807146887] [2021-05-02 13:04:16,023 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1807146887] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:16,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510185929] [2021-05-02 13:04:16,023 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:16,212 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 13:04:16,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:16,213 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 13:04:16,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:16,523 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 18 proven. 44 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-05-02 13:04:16,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510185929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:16,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:16,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10] total 28 [2021-05-02 13:04:16,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181546342] [2021-05-02 13:04:16,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:04:16,524 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:16,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:04:16,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=696, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:04:16,524 INFO L87 Difference]: Start difference. First operand 485 states and 644 transitions. Second operand has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:17,541 WARN L205 SmtUtils]: Spent 198.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:17,791 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:04:18,206 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:04:18,547 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:18,909 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:04:19,253 WARN L205 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:04:19,682 WARN L205 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:04:20,053 WARN L205 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:04:20,348 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:04:20,708 WARN L205 SmtUtils]: Spent 239.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:04:21,032 WARN L205 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:04:21,407 WARN L205 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:04:21,862 WARN L205 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:04:22,248 WARN L205 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:04:22,496 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:22,795 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:04:23,113 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:04:23,494 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:04:23,899 WARN L205 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:04:24,278 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:24,603 WARN L205 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:04:24,917 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:04:25,386 WARN L205 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:04:25,886 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:04:26,177 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:04:26,695 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:04:26,987 WARN L205 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:04:27,625 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:04:31,060 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:04:31,696 WARN L205 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:32,185 WARN L205 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:32,964 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:04:33,350 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:04:33,801 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:34,236 WARN L205 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:35,217 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:04:35,557 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:04:36,185 WARN L205 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:36,499 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:37,263 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:04:37,631 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:04:37,967 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:04:38,223 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:04:38,676 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:39,025 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:04:40,043 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:04:40,472 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:04:40,840 WARN L205 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:04:41,282 WARN L205 SmtUtils]: Spent 292.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:41,911 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:04:42,506 WARN L205 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:04:42,986 WARN L205 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:43,384 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:04:44,212 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:04:44,845 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:45,298 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:45,975 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:04:46,445 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:04:47,080 WARN L205 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:04:48,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:48,662 INFO L93 Difference]: Finished difference Result 901 states and 1188 transitions. [2021-05-02 13:04:48,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2021-05-02 13:04:48,663 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 13:04:48,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:48,665 INFO L225 Difference]: With dead ends: 901 [2021-05-02 13:04:48,665 INFO L226 Difference]: Without dead ends: 852 [2021-05-02 13:04:48,666 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9660 ImplicationChecksByTransitivity, 26199.8ms TimeCoverageRelationStatistics Valid=2509, Invalid=25213, Unknown=0, NotChecked=0, Total=27722 [2021-05-02 13:04:48,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 852 states. [2021-05-02 13:04:48,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 852 to 455. [2021-05-02 13:04:48,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 455 states, 450 states have (on average 1.3377777777777777) internal successors, (602), 450 states have internal predecessors, (602), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:48,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455 states to 455 states and 606 transitions. [2021-05-02 13:04:48,691 INFO L78 Accepts]: Start accepts. Automaton has 455 states and 606 transitions. Word has length 40 [2021-05-02 13:04:48,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:48,692 INFO L480 AbstractCegarLoop]: Abstraction has 455 states and 606 transitions. [2021-05-02 13:04:48,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:48,692 INFO L276 IsEmpty]: Start isEmpty. Operand 455 states and 606 transitions. [2021-05-02 13:04:48,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:04:48,692 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:48,692 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:48,893 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,62 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:48,893 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:48,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:48,893 INFO L82 PathProgramCache]: Analyzing trace with hash -559628798, now seen corresponding path program 9 times [2021-05-02 13:04:48,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:48,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083376657] [2021-05-02 13:04:48,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:48,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:49,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:49,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:49,326 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:49,326 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:49,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083376657] [2021-05-02 13:04:49,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2083376657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:49,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929426396] [2021-05-02 13:04:49,327 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:49,488 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 13:04:49,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:49,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 69 conjunts are in the unsatisfiable core [2021-05-02 13:04:49,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:49,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,519 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,819 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,846 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:49,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929426396] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:49,846 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:49,846 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20] total 22 [2021-05-02 13:04:49,847 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912307729] [2021-05-02 13:04:49,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:04:49,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:49,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:04:49,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:04:49,847 INFO L87 Difference]: Start difference. First operand 455 states and 606 transitions. Second operand has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:56,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:56,812 INFO L93 Difference]: Finished difference Result 656 states and 925 transitions. [2021-05-02 13:04:56,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-05-02 13:04:56,813 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 13:04:56,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:56,815 INFO L225 Difference]: With dead ends: 656 [2021-05-02 13:04:56,815 INFO L226 Difference]: Without dead ends: 639 [2021-05-02 13:04:56,815 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 41 SyntacticMatches, 8 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4766 ImplicationChecksByTransitivity, 4554.0ms TimeCoverageRelationStatistics Valid=691, Invalid=13829, Unknown=0, NotChecked=0, Total=14520 [2021-05-02 13:04:56,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2021-05-02 13:04:56,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 466. [2021-05-02 13:04:56,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 461 states have (on average 1.3297180043383947) internal successors, (613), 461 states have internal predecessors, (613), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:56,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 617 transitions. [2021-05-02 13:04:56,840 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 617 transitions. Word has length 40 [2021-05-02 13:04:56,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:56,840 INFO L480 AbstractCegarLoop]: Abstraction has 466 states and 617 transitions. [2021-05-02 13:04:56,840 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.8636363636363635) internal successors, (41), 21 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:56,840 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 617 transitions. [2021-05-02 13:04:56,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:04:56,841 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:56,841 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:57,042 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-05-02 13:04:57,043 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:57,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:57,043 INFO L82 PathProgramCache]: Analyzing trace with hash -286560430, now seen corresponding path program 22 times [2021-05-02 13:04:57,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:57,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176373662] [2021-05-02 13:04:57,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:57,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:57,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:57,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:57,330 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-05-02 13:04:57,330 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:57,330 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176373662] [2021-05-02 13:04:57,331 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176373662] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:57,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [884660983] [2021-05-02 13:04:57,331 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:57,394 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:04:57,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:57,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:04:57,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:57,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:57,527 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-05-02 13:04:57,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [884660983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:57,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:57,528 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 13:04:57,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045910986] [2021-05-02 13:04:57,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:04:57,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:57,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:04:57,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:04:57,529 INFO L87 Difference]: Start difference. First operand 466 states and 617 transitions. Second operand has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:59,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:59,044 INFO L93 Difference]: Finished difference Result 688 states and 888 transitions. [2021-05-02 13:04:59,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:04:59,045 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 13:04:59,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:59,047 INFO L225 Difference]: With dead ends: 688 [2021-05-02 13:04:59,047 INFO L226 Difference]: Without dead ends: 668 [2021-05-02 13:04:59,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 982.9ms TimeCoverageRelationStatistics Valid=147, Invalid=1259, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:04:59,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2021-05-02 13:04:59,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 466. [2021-05-02 13:04:59,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 461 states have (on average 1.3275488069414316) internal successors, (612), 461 states have internal predecessors, (612), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:59,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 616 transitions. [2021-05-02 13:04:59,074 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 616 transitions. Word has length 40 [2021-05-02 13:04:59,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:59,074 INFO L480 AbstractCegarLoop]: Abstraction has 466 states and 616 transitions. [2021-05-02 13:04:59,074 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.6111111111111112) internal successors, (29), 17 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:59,075 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 616 transitions. [2021-05-02 13:04:59,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:04:59,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:59,075 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:59,276 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,64 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:59,276 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:59,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:59,277 INFO L82 PathProgramCache]: Analyzing trace with hash -727872510, now seen corresponding path program 23 times [2021-05-02 13:04:59,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:59,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473049455] [2021-05-02 13:04:59,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:59,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:59,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:59,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:59,552 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-05-02 13:04:59,552 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:59,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473049455] [2021-05-02 13:04:59,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [473049455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:59,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314455444] [2021-05-02 13:04:59,552 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:00,768 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 13:05:00,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:00,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 60 conjunts are in the unsatisfiable core [2021-05-02 13:05:00,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:00,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:00,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:00,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:00,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:00,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:00,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:00,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:00,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:00,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:00,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:00,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:01,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:01,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:01,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:01,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:01,203 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:05:01,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314455444] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:01,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:01,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 24] total 26 [2021-05-02 13:05:01,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133215618] [2021-05-02 13:05:01,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:05:01,204 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:01,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:05:01,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=590, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:05:01,204 INFO L87 Difference]: Start difference. First operand 466 states and 616 transitions. Second operand has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:03,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:03,660 INFO L93 Difference]: Finished difference Result 723 states and 928 transitions. [2021-05-02 13:05:03,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:05:03,661 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 13:05:03,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:03,663 INFO L225 Difference]: With dead ends: 723 [2021-05-02 13:05:03,663 INFO L226 Difference]: Without dead ends: 703 [2021-05-02 13:05:03,663 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 1205.6ms TimeCoverageRelationStatistics Valid=146, Invalid=1660, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:05:03,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 703 states. [2021-05-02 13:05:03,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 703 to 466. [2021-05-02 13:05:03,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 461 states have (on average 1.3253796095444685) internal successors, (611), 461 states have internal predecessors, (611), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:03,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 615 transitions. [2021-05-02 13:05:03,689 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 615 transitions. Word has length 40 [2021-05-02 13:05:03,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:03,689 INFO L480 AbstractCegarLoop]: Abstraction has 466 states and 615 transitions. [2021-05-02 13:05:03,689 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:03,689 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 615 transitions. [2021-05-02 13:05:03,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 13:05:03,690 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:03,690 INFO L523 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:03,891 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-05-02 13:05:03,891 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:03,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:03,892 INFO L82 PathProgramCache]: Analyzing trace with hash 2135352450, now seen corresponding path program 24 times [2021-05-02 13:05:03,892 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:03,892 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111111363] [2021-05-02 13:05:03,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:03,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:04,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:04,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:04,559 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:05:04,559 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:04,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111111363] [2021-05-02 13:05:04,559 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111111363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:04,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603733634] [2021-05-02 13:05:04,559 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:05,539 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 13:05:05,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:05,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 13:05:05,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:05,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:05,703 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:05:05,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603733634] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:05,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:05,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 13:05:05,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449720147] [2021-05-02 13:05:05,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 13:05:05,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:05,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 13:05:05,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=812, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:05:05,704 INFO L87 Difference]: Start difference. First operand 466 states and 615 transitions. Second operand has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:11,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:11,490 INFO L93 Difference]: Finished difference Result 1074 states and 1530 transitions. [2021-05-02 13:05:11,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:05:11,491 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 13:05:11,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:11,494 INFO L225 Difference]: With dead ends: 1074 [2021-05-02 13:05:11,494 INFO L226 Difference]: Without dead ends: 1036 [2021-05-02 13:05:11,494 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1767.4ms TimeCoverageRelationStatistics Valid=165, Invalid=2915, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:05:11,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1036 states. [2021-05-02 13:05:11,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1036 to 483. [2021-05-02 13:05:11,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 478 states have (on average 1.3305439330543933) internal successors, (636), 478 states have internal predecessors, (636), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:11,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 640 transitions. [2021-05-02 13:05:11,521 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 640 transitions. Word has length 40 [2021-05-02 13:05:11,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:11,521 INFO L480 AbstractCegarLoop]: Abstraction has 483 states and 640 transitions. [2021-05-02 13:05:11,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.3) internal successors, (39), 29 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:11,522 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 640 transitions. [2021-05-02 13:05:11,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 13:05:11,522 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:11,522 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:11,727 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-05-02 13:05:11,727 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:11,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:11,727 INFO L82 PathProgramCache]: Analyzing trace with hash -264974095, now seen corresponding path program 10 times [2021-05-02 13:05:11,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:11,728 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188191363] [2021-05-02 13:05:11,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:11,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:12,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:12,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:12,421 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:05:12,421 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:12,421 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188191363] [2021-05-02 13:05:12,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [188191363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:12,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [486450029] [2021-05-02 13:05:12,422 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:12,467 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:05:12,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:12,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 13:05:12,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:12,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:12,939 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:05:12,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [486450029] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:12,939 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:12,939 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 10] total 24 [2021-05-02 13:05:12,939 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517222157] [2021-05-02 13:05:12,939 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:05:12,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:12,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:05:12,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:05:12,940 INFO L87 Difference]: Start difference. First operand 483 states and 640 transitions. Second operand has 24 states, 24 states have (on average 2.625) internal successors, (63), 21 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:14,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:14,156 INFO L93 Difference]: Finished difference Result 495 states and 652 transitions. [2021-05-02 13:05:14,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 13:05:14,157 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 21 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 13:05:14,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:14,158 INFO L225 Difference]: With dead ends: 495 [2021-05-02 13:05:14,158 INFO L226 Difference]: Without dead ends: 484 [2021-05-02 13:05:14,159 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 36 SyntacticMatches, 10 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1568.0ms TimeCoverageRelationStatistics Valid=141, Invalid=1191, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:05:14,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2021-05-02 13:05:14,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 484. [2021-05-02 13:05:14,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 479 states have (on average 1.3298538622129437) internal successors, (637), 479 states have internal predecessors, (637), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:14,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 641 transitions. [2021-05-02 13:05:14,185 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 641 transitions. Word has length 41 [2021-05-02 13:05:14,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:14,186 INFO L480 AbstractCegarLoop]: Abstraction has 484 states and 641 transitions. [2021-05-02 13:05:14,186 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.625) internal successors, (63), 21 states have internal predecessors, (63), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:14,186 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 641 transitions. [2021-05-02 13:05:14,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 13:05:14,186 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:14,186 INFO L523 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:14,402 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,67 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:14,402 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:14,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:14,403 INFO L82 PathProgramCache]: Analyzing trace with hash -82492785, now seen corresponding path program 25 times [2021-05-02 13:05:14,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:14,403 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545658023] [2021-05-02 13:05:14,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:14,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:15,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:15,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:15,248 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:05:15,248 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:15,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545658023] [2021-05-02 13:05:15,248 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545658023] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:15,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969580700] [2021-05-02 13:05:15,249 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:15,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:15,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 13:05:15,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:15,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:15,509 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:05:15,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [969580700] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:15,509 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:15,509 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 13:05:15,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137931729] [2021-05-02 13:05:15,509 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:05:15,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:15,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:05:15,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=870, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:05:15,510 INFO L87 Difference]: Start difference. First operand 484 states and 641 transitions. Second operand has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 30 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:22,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:22,206 INFO L93 Difference]: Finished difference Result 1113 states and 1588 transitions. [2021-05-02 13:05:22,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:05:22,207 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 30 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 13:05:22,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:22,210 INFO L225 Difference]: With dead ends: 1113 [2021-05-02 13:05:22,210 INFO L226 Difference]: Without dead ends: 1075 [2021-05-02 13:05:22,211 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 2097.6ms TimeCoverageRelationStatistics Valid=171, Invalid=3135, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:05:22,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1075 states. [2021-05-02 13:05:22,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1075 to 501. [2021-05-02 13:05:22,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 496 states have (on average 1.3346774193548387) internal successors, (662), 496 states have internal predecessors, (662), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:22,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 666 transitions. [2021-05-02 13:05:22,239 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 666 transitions. Word has length 41 [2021-05-02 13:05:22,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:22,240 INFO L480 AbstractCegarLoop]: Abstraction has 501 states and 666 transitions. [2021-05-02 13:05:22,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 30 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:22,240 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 666 transitions. [2021-05-02 13:05:22,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:05:22,240 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:22,241 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:22,444 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,68 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:22,446 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:22,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:22,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1741037917, now seen corresponding path program 11 times [2021-05-02 13:05:22,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:22,447 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712531167] [2021-05-02 13:05:22,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:22,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:22,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:22,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:22,636 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 13:05:22,636 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:22,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712531167] [2021-05-02 13:05:22,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712531167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:22,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700778654] [2021-05-02 13:05:22,636 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:22,935 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 13:05:22,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:22,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 13:05:22,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:22,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:22,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:22,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:22,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:22,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:22,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:22,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:23,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:23,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:23,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:23,096 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 13:05:23,097 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700778654] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:23,097 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:23,097 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 9 [2021-05-02 13:05:23,097 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151616964] [2021-05-02 13:05:23,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:05:23,097 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:23,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:05:23,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:05:23,098 INFO L87 Difference]: Start difference. First operand 501 states and 666 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:23,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:23,742 INFO L93 Difference]: Finished difference Result 548 states and 723 transitions. [2021-05-02 13:05:23,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:05:23,743 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 13:05:23,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:23,745 INFO L225 Difference]: With dead ends: 548 [2021-05-02 13:05:23,745 INFO L226 Difference]: Without dead ends: 514 [2021-05-02 13:05:23,745 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 44 SyntacticMatches, 5 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 362.1ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:05:23,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2021-05-02 13:05:23,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 479. [2021-05-02 13:05:23,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 474 states have (on average 1.3459915611814346) internal successors, (638), 474 states have internal predecessors, (638), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:23,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 642 transitions. [2021-05-02 13:05:23,778 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 642 transitions. Word has length 42 [2021-05-02 13:05:23,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:23,778 INFO L480 AbstractCegarLoop]: Abstraction has 479 states and 642 transitions. [2021-05-02 13:05:23,778 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:23,778 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 642 transitions. [2021-05-02 13:05:23,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:05:23,779 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:23,779 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:23,979 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,69 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:23,979 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:23,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:23,980 INFO L82 PathProgramCache]: Analyzing trace with hash -2141964876, now seen corresponding path program 24 times [2021-05-02 13:05:23,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:23,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135068176] [2021-05-02 13:05:23,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:23,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:24,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:24,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:24,304 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 13:05:24,304 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:24,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135068176] [2021-05-02 13:05:24,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135068176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:24,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1734806227] [2021-05-02 13:05:24,305 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:24,586 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2021-05-02 13:05:24,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:24,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 13:05:24,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:24,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:24,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:24,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:24,745 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 13:05:24,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1734806227] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:24,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:24,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 13:05:24,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628190069] [2021-05-02 13:05:24,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:05:24,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:24,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:05:24,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=302, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:05:24,746 INFO L87 Difference]: Start difference. First operand 479 states and 642 transitions. Second operand has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:26,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:26,685 INFO L93 Difference]: Finished difference Result 683 states and 890 transitions. [2021-05-02 13:05:26,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:05:26,686 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 13:05:26,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:26,688 INFO L225 Difference]: With dead ends: 683 [2021-05-02 13:05:26,688 INFO L226 Difference]: Without dead ends: 662 [2021-05-02 13:05:26,688 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 1223.8ms TimeCoverageRelationStatistics Valid=178, Invalid=1628, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:05:26,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 662 states. [2021-05-02 13:05:26,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 662 to 479. [2021-05-02 13:05:26,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 474 states have (on average 1.3438818565400843) internal successors, (637), 474 states have internal predecessors, (637), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:26,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 641 transitions. [2021-05-02 13:05:26,715 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 641 transitions. Word has length 42 [2021-05-02 13:05:26,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:26,715 INFO L480 AbstractCegarLoop]: Abstraction has 479 states and 641 transitions. [2021-05-02 13:05:26,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:26,715 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 641 transitions. [2021-05-02 13:05:26,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:05:26,716 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:26,716 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:26,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,70 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:26,916 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:26,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:26,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1772981812, now seen corresponding path program 10 times [2021-05-02 13:05:26,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:26,917 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458185563] [2021-05-02 13:05:26,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:26,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:27,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:27,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:27,355 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 13:05:27,355 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:27,355 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458185563] [2021-05-02 13:05:27,355 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458185563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:27,355 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658656176] [2021-05-02 13:05:27,355 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:27,398 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:05:27,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:27,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 13:05:27,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:27,937 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 16 proven. 64 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-05-02 13:05:27,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658656176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:27,937 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:27,937 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 11] total 31 [2021-05-02 13:05:27,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298769530] [2021-05-02 13:05:27,937 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:05:27,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:27,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:05:27,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=863, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:05:27,938 INFO L87 Difference]: Start difference. First operand 479 states and 641 transitions. Second operand has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:28,858 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:05:29,298 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:05:30,474 WARN L205 SmtUtils]: Spent 708.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:05:30,989 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:05:31,894 WARN L205 SmtUtils]: Spent 545.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:32,932 WARN L205 SmtUtils]: Spent 608.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:05:34,193 WARN L205 SmtUtils]: Spent 759.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:05:35,452 WARN L205 SmtUtils]: Spent 840.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:05:36,315 WARN L205 SmtUtils]: Spent 508.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:37,366 WARN L205 SmtUtils]: Spent 443.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:05:38,271 WARN L205 SmtUtils]: Spent 345.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:05:39,212 WARN L205 SmtUtils]: Spent 496.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:05:40,692 WARN L205 SmtUtils]: Spent 988.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:42,137 WARN L205 SmtUtils]: Spent 806.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:05:42,668 WARN L205 SmtUtils]: Spent 295.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:05:43,503 WARN L205 SmtUtils]: Spent 508.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:05:44,663 WARN L205 SmtUtils]: Spent 696.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:05:45,629 WARN L205 SmtUtils]: Spent 586.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:05:45,895 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:05:46,215 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:05:46,959 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:05:48,627 WARN L205 SmtUtils]: Spent 1.36 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:05:49,070 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:05:49,481 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:05:50,159 WARN L205 SmtUtils]: Spent 334.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:05:51,173 WARN L205 SmtUtils]: Spent 484.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:05:51,684 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:05:52,102 WARN L205 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:05:52,733 WARN L205 SmtUtils]: Spent 367.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:05:53,419 WARN L205 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:05:53,751 WARN L205 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:05:58,530 WARN L205 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:05:59,610 WARN L205 SmtUtils]: Spent 484.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:06:00,079 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:06:01,339 WARN L205 SmtUtils]: Spent 616.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:06:02,269 WARN L205 SmtUtils]: Spent 530.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:06:02,869 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:06:03,946 WARN L205 SmtUtils]: Spent 365.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:06:05,110 WARN L205 SmtUtils]: Spent 359.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:06:06,219 WARN L205 SmtUtils]: Spent 592.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:06:07,059 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:06:07,577 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:06:08,243 WARN L205 SmtUtils]: Spent 305.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:06:09,511 WARN L205 SmtUtils]: Spent 599.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:06:10,072 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:06:10,764 WARN L205 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:06:11,040 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:06:11,634 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:06:12,085 WARN L205 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:06:12,853 WARN L205 SmtUtils]: Spent 375.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:06:14,352 WARN L205 SmtUtils]: Spent 1.01 s on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:06:15,012 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:06:15,990 WARN L205 SmtUtils]: Spent 549.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:06:17,080 WARN L205 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:06:17,511 WARN L205 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:06:18,160 WARN L205 SmtUtils]: Spent 309.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:06:19,282 WARN L205 SmtUtils]: Spent 518.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:06:21,232 WARN L205 SmtUtils]: Spent 722.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:06:22,231 WARN L205 SmtUtils]: Spent 400.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:06:24,508 WARN L205 SmtUtils]: Spent 908.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:06:25,961 WARN L205 SmtUtils]: Spent 689.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:06:26,813 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:06:27,238 WARN L205 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:06:28,089 WARN L205 SmtUtils]: Spent 344.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:06:29,392 WARN L205 SmtUtils]: Spent 608.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:06:30,188 WARN L205 SmtUtils]: Spent 312.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:06:31,538 WARN L205 SmtUtils]: Spent 620.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:06:32,782 WARN L205 SmtUtils]: Spent 724.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:06:33,872 WARN L205 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:06:34,550 WARN L205 SmtUtils]: Spent 386.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:06:35,510 WARN L205 SmtUtils]: Spent 417.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:06:36,505 WARN L205 SmtUtils]: Spent 614.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:06:36,983 WARN L205 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:06:37,881 WARN L205 SmtUtils]: Spent 429.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:06:39,351 WARN L205 SmtUtils]: Spent 608.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:06:40,063 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:06:40,396 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:06:40,856 WARN L205 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:06:41,642 WARN L205 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:06:41,985 WARN L205 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:06:42,441 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:06:43,317 WARN L205 SmtUtils]: Spent 360.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:06:43,895 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:06:44,330 WARN L205 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:06:45,024 WARN L205 SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:06:45,574 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:06:46,088 WARN L205 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:06:47,021 WARN L205 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:06:47,282 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:06:47,576 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:06:48,341 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:06:48,638 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 13:06:51,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:51,789 INFO L93 Difference]: Finished difference Result 1103 states and 1449 transitions. [2021-05-02 13:06:51,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 167 states. [2021-05-02 13:06:51,795 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 13:06:51,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:51,796 INFO L225 Difference]: With dead ends: 1103 [2021-05-02 13:06:51,796 INFO L226 Difference]: Without dead ends: 1048 [2021-05-02 13:06:51,798 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13419 ImplicationChecksByTransitivity, 70251.4ms TimeCoverageRelationStatistics Valid=3362, Invalid=34468, Unknown=0, NotChecked=0, Total=37830 [2021-05-02 13:06:51,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1048 states. [2021-05-02 13:06:51,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1048 to 526. [2021-05-02 13:06:51,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 526 states, 521 states have (on average 1.3435700575815739) internal successors, (700), 521 states have internal predecessors, (700), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:51,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 704 transitions. [2021-05-02 13:06:51,828 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 704 transitions. Word has length 42 [2021-05-02 13:06:51,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:51,828 INFO L480 AbstractCegarLoop]: Abstraction has 526 states and 704 transitions. [2021-05-02 13:06:51,829 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:51,829 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 704 transitions. [2021-05-02 13:06:51,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:06:51,829 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:51,829 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:52,030 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-05-02 13:06:52,030 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:52,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:52,030 INFO L82 PathProgramCache]: Analyzing trace with hash 70932066, now seen corresponding path program 25 times [2021-05-02 13:06:52,030 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:52,030 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [280619060] [2021-05-02 13:06:52,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:52,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:52,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:52,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:52,505 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-05-02 13:06:52,505 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:52,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [280619060] [2021-05-02 13:06:52,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [280619060] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:52,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870952277] [2021-05-02 13:06:52,505 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:52,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:52,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:06:52,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:52,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:52,745 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 61 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-05-02 13:06:52,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870952277] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:52,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:52,746 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 13:06:52,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129044904] [2021-05-02 13:06:52,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:06:52,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:52,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:06:52,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=303, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:06:52,746 INFO L87 Difference]: Start difference. First operand 526 states and 704 transitions. Second operand has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:55,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:55,724 INFO L93 Difference]: Finished difference Result 766 states and 992 transitions. [2021-05-02 13:06:55,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:06:55,726 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 13:06:55,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:55,727 INFO L225 Difference]: With dead ends: 766 [2021-05-02 13:06:55,727 INFO L226 Difference]: Without dead ends: 745 [2021-05-02 13:06:55,728 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 1557.6ms TimeCoverageRelationStatistics Valid=153, Invalid=1407, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:06:55,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 745 states. [2021-05-02 13:06:55,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 745 to 526. [2021-05-02 13:06:55,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 526 states, 521 states have (on average 1.3416506717850287) internal successors, (699), 521 states have internal predecessors, (699), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:55,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 703 transitions. [2021-05-02 13:06:55,757 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 703 transitions. Word has length 42 [2021-05-02 13:06:55,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:55,757 INFO L480 AbstractCegarLoop]: Abstraction has 526 states and 703 transitions. [2021-05-02 13:06:55,757 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.5789473684210527) internal successors, (30), 18 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:06:55,757 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 703 transitions. [2021-05-02 13:06:55,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:06:55,758 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:55,758 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:55,958 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,72 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:55,958 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:55,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:55,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1943431156, now seen corresponding path program 26 times [2021-05-02 13:06:55,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:55,959 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [339079848] [2021-05-02 13:06:55,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:55,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:56,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:56,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:56,476 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 69 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-05-02 13:06:56,476 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:56,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [339079848] [2021-05-02 13:06:56,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [339079848] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:56,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [910615784] [2021-05-02 13:06:56,477 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:06:56,532 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:06:56,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:56,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 13:06:56,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:57,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:57,233 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:06:57,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [910615784] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:57,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:57,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 26] total 28 [2021-05-02 13:06:57,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491356594] [2021-05-02 13:06:57,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:06:57,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:57,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:06:57,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:06:57,235 INFO L87 Difference]: Start difference. First operand 526 states and 703 transitions. Second operand has 28 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 27 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:00,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:00,621 INFO L93 Difference]: Finished difference Result 802 states and 1032 transitions. [2021-05-02 13:07:00,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:07:00,623 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 27 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 13:07:00,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:00,624 INFO L225 Difference]: With dead ends: 802 [2021-05-02 13:07:00,624 INFO L226 Difference]: Without dead ends: 781 [2021-05-02 13:07:00,624 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 1938.8ms TimeCoverageRelationStatistics Valid=155, Invalid=1915, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:07:00,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2021-05-02 13:07:00,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 526. [2021-05-02 13:07:00,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 526 states, 521 states have (on average 1.3397312859884838) internal successors, (698), 521 states have internal predecessors, (698), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:00,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 702 transitions. [2021-05-02 13:07:00,654 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 702 transitions. Word has length 42 [2021-05-02 13:07:00,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:00,654 INFO L480 AbstractCegarLoop]: Abstraction has 526 states and 702 transitions. [2021-05-02 13:07:00,654 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.6071428571428572) internal successors, (45), 27 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:00,654 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 702 transitions. [2021-05-02 13:07:00,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 13:07:00,655 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:00,655 INFO L523 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:00,856 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2021-05-02 13:07:00,857 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:00,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:00,857 INFO L82 PathProgramCache]: Analyzing trace with hash -116218334, now seen corresponding path program 26 times [2021-05-02 13:07:00,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:00,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985119916] [2021-05-02 13:07:00,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:00,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:02,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:02,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:02,054 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:07:02,055 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:02,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985119916] [2021-05-02 13:07:02,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [985119916] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:02,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2053741399] [2021-05-02 13:07:02,055 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:02,111 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:07:02,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:02,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 13:07:02,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:02,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:02,403 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:07:02,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2053741399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:02,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:02,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 13:07:02,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312846993] [2021-05-02 13:07:02,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 13:07:02,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:02,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 13:07:02,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=930, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:07:02,404 INFO L87 Difference]: Start difference. First operand 526 states and 702 transitions. Second operand has 32 states, 32 states have (on average 1.28125) internal successors, (41), 31 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:14,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:14,839 INFO L93 Difference]: Finished difference Result 1175 states and 1688 transitions. [2021-05-02 13:07:14,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:07:14,841 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.28125) internal successors, (41), 31 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2021-05-02 13:07:14,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:14,843 INFO L225 Difference]: With dead ends: 1175 [2021-05-02 13:07:14,843 INFO L226 Difference]: Without dead ends: 1138 [2021-05-02 13:07:14,844 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 3291.0ms TimeCoverageRelationStatistics Valid=177, Invalid=3363, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:07:14,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1138 states. [2021-05-02 13:07:14,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1138 to 545. [2021-05-02 13:07:14,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 545 states, 540 states have (on average 1.3444444444444446) internal successors, (726), 540 states have internal predecessors, (726), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:14,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 545 states to 545 states and 730 transitions. [2021-05-02 13:07:14,882 INFO L78 Accepts]: Start accepts. Automaton has 545 states and 730 transitions. Word has length 42 [2021-05-02 13:07:14,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:14,882 INFO L480 AbstractCegarLoop]: Abstraction has 545 states and 730 transitions. [2021-05-02 13:07:14,882 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.28125) internal successors, (41), 31 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:14,882 INFO L276 IsEmpty]: Start isEmpty. Operand 545 states and 730 transitions. [2021-05-02 13:07:14,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:07:14,883 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:14,883 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:15,088 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77,74 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:15,089 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:15,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:15,089 INFO L82 PathProgramCache]: Analyzing trace with hash -1425014320, now seen corresponding path program 12 times [2021-05-02 13:07:15,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:15,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713381040] [2021-05-02 13:07:15,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:15,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:15,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:15,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:15,519 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 21 proven. 27 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:07:15,519 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:15,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713381040] [2021-05-02 13:07:15,520 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713381040] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:15,520 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109109104] [2021-05-02 13:07:15,520 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:15,846 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 13:07:15,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:15,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 13:07:15,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:16,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:16,280 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-05-02 13:07:16,280 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109109104] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:16,280 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:16,280 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 22 [2021-05-02 13:07:16,280 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696543118] [2021-05-02 13:07:16,281 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:07:16,281 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:16,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:07:16,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=350, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:07:16,281 INFO L87 Difference]: Start difference. First operand 545 states and 730 transitions. Second operand has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:21,705 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:07:23,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:23,705 INFO L93 Difference]: Finished difference Result 731 states and 990 transitions. [2021-05-02 13:07:23,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:07:23,708 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 13:07:23,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:23,709 INFO L225 Difference]: With dead ends: 731 [2021-05-02 13:07:23,709 INFO L226 Difference]: Without dead ends: 716 [2021-05-02 13:07:23,710 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 3821.8ms TimeCoverageRelationStatistics Valid=498, Invalid=1854, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:07:23,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 716 states. [2021-05-02 13:07:23,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 716 to 645. [2021-05-02 13:07:23,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 645 states, 640 states have (on average 1.340625) internal successors, (858), 640 states have internal predecessors, (858), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:23,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 645 states to 645 states and 862 transitions. [2021-05-02 13:07:23,749 INFO L78 Accepts]: Start accepts. Automaton has 645 states and 862 transitions. Word has length 43 [2021-05-02 13:07:23,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:23,749 INFO L480 AbstractCegarLoop]: Abstraction has 645 states and 862 transitions. [2021-05-02 13:07:23,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.1818181818181817) internal successors, (48), 21 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:23,749 INFO L276 IsEmpty]: Start isEmpty. Operand 645 states and 862 transitions. [2021-05-02 13:07:23,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:07:23,750 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:23,750 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:23,952 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-05-02 13:07:23,952 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:23,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:23,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1304109344, now seen corresponding path program 11 times [2021-05-02 13:07:23,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:23,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952114033] [2021-05-02 13:07:23,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:23,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:25,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:25,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:25,216 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:07:25,216 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:25,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952114033] [2021-05-02 13:07:25,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [952114033] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:25,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [408001038] [2021-05-02 13:07:25,217 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:26,550 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 13:07:26,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:26,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 13:07:26,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:28,059 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 9 proven. 81 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 13:07:28,059 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [408001038] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:28,059 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:28,059 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 12] total 34 [2021-05-02 13:07:28,060 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300344145] [2021-05-02 13:07:28,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:07:28,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:28,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:07:28,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=1056, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:07:28,060 INFO L87 Difference]: Start difference. First operand 645 states and 862 transitions. Second operand has 34 states, 34 states have (on average 1.9411764705882353) internal successors, (66), 33 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:29,183 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 13:07:29,601 WARN L205 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:07:30,157 WARN L205 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:07:31,986 WARN L205 SmtUtils]: Spent 965.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:07:32,889 WARN L205 SmtUtils]: Spent 319.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:07:34,671 WARN L205 SmtUtils]: Spent 1.10 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:07:36,912 WARN L205 SmtUtils]: Spent 1.50 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:07:38,079 WARN L205 SmtUtils]: Spent 546.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:07:41,523 WARN L205 SmtUtils]: Spent 1.96 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:07:43,604 WARN L205 SmtUtils]: Spent 1.06 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:07:45,809 WARN L205 SmtUtils]: Spent 1.35 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:07:48,811 WARN L205 SmtUtils]: Spent 1.37 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:07:50,589 WARN L205 SmtUtils]: Spent 1.04 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:07:52,669 WARN L205 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:07:55,004 WARN L205 SmtUtils]: Spent 1.42 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:07:57,861 WARN L205 SmtUtils]: Spent 963.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:07:59,117 WARN L205 SmtUtils]: Spent 579.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:08:00,806 WARN L205 SmtUtils]: Spent 780.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:08:03,477 WARN L205 SmtUtils]: Spent 1.43 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:08:06,119 WARN L205 SmtUtils]: Spent 1.29 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:08:06,885 WARN L205 SmtUtils]: Spent 395.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:08:08,030 WARN L205 SmtUtils]: Spent 655.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:08:10,112 WARN L205 SmtUtils]: Spent 645.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:08:12,795 WARN L205 SmtUtils]: Spent 1.20 s on a formula simplification that was a NOOP. DAG size: 75 [2021-05-02 13:08:13,479 WARN L205 SmtUtils]: Spent 319.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:08:14,313 WARN L205 SmtUtils]: Spent 349.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:08:15,654 WARN L205 SmtUtils]: Spent 605.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:08:17,970 WARN L205 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:08:21,446 WARN L205 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:08:22,120 WARN L205 SmtUtils]: Spent 263.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:08:23,092 WARN L205 SmtUtils]: Spent 399.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:08:24,540 WARN L205 SmtUtils]: Spent 673.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:08:26,052 WARN L205 SmtUtils]: Spent 621.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:08:27,789 WARN L205 SmtUtils]: Spent 842.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:08:28,336 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:08:29,037 WARN L205 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:08:29,972 WARN L205 SmtUtils]: Spent 448.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:08:31,459 WARN L205 SmtUtils]: Spent 922.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-05-02 13:08:31,957 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:08:32,321 WARN L205 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:08:32,815 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:08:33,574 WARN L205 SmtUtils]: Spent 321.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:08:34,505 WARN L205 SmtUtils]: Spent 472.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2021-05-02 13:08:35,002 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:08:35,471 WARN L205 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:08:35,991 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:08:36,823 WARN L205 SmtUtils]: Spent 250.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:08:37,751 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:08:38,100 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:08:38,731 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:08:39,269 WARN L205 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2021-05-02 13:08:40,143 WARN L205 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:08:40,457 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:08:41,504 WARN L205 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:08:41,833 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:08:42,939 WARN L205 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:08:43,320 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2021-05-02 13:08:44,282 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:08:45,226 WARN L205 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:08:45,574 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:08:46,859 WARN L205 SmtUtils]: Spent 357.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:08:47,181 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 13:08:48,601 WARN L205 SmtUtils]: Spent 490.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2021-05-02 13:08:50,509 WARN L205 SmtUtils]: Spent 663.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:08:50,829 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 13:08:54,270 WARN L205 SmtUtils]: Spent 1.50 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:08:54,794 WARN L205 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:08:56,342 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:09:01,260 WARN L205 SmtUtils]: Spent 1.70 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:09:02,417 WARN L205 SmtUtils]: Spent 429.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:09:03,953 WARN L205 SmtUtils]: Spent 394.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:09:08,394 WARN L205 SmtUtils]: Spent 1.84 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:09:11,398 WARN L205 SmtUtils]: Spent 1.52 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:09:12,925 WARN L205 SmtUtils]: Spent 755.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2021-05-02 13:09:15,695 WARN L205 SmtUtils]: Spent 1.51 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:09:16,028 WARN L205 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 13:09:17,435 WARN L205 SmtUtils]: Spent 622.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:09:18,035 WARN L205 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:09:23,713 WARN L205 SmtUtils]: Spent 2.26 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:09:29,093 WARN L205 SmtUtils]: Spent 3.21 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:09:34,509 WARN L205 SmtUtils]: Spent 2.61 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:09:39,672 WARN L205 SmtUtils]: Spent 2.82 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:09:42,740 WARN L205 SmtUtils]: Spent 1.93 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:09:48,060 WARN L205 SmtUtils]: Spent 2.98 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:09:48,770 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:09:51,510 WARN L205 SmtUtils]: Spent 1.36 s on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:09:52,178 WARN L205 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 13:09:59,306 WARN L205 SmtUtils]: Spent 1.64 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:10:05,041 WARN L205 SmtUtils]: Spent 2.77 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:10:10,491 WARN L205 SmtUtils]: Spent 2.58 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:10:13,867 WARN L205 SmtUtils]: Spent 1.41 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:10:20,885 WARN L205 SmtUtils]: Spent 3.17 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:10:25,558 WARN L205 SmtUtils]: Spent 2.71 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:10:30,129 WARN L205 SmtUtils]: Spent 1.67 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:10:31,580 WARN L205 SmtUtils]: Spent 490.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:10:31,922 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2021-05-02 13:10:32,512 WARN L205 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 13:10:36,450 WARN L205 SmtUtils]: Spent 1.22 s on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:10:39,677 WARN L205 SmtUtils]: Spent 1.39 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:10:43,506 WARN L205 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 75 [2021-05-02 13:10:45,188 WARN L205 SmtUtils]: Spent 881.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:10:47,945 WARN L205 SmtUtils]: Spent 1.39 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:10:52,974 WARN L205 SmtUtils]: Spent 1.78 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:10:58,372 WARN L205 SmtUtils]: Spent 2.53 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:11:00,361 WARN L205 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:11:03,782 WARN L205 SmtUtils]: Spent 1.57 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:11:04,717 WARN L205 SmtUtils]: Spent 390.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:11:07,611 WARN L205 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:11:07,918 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2021-05-02 13:11:10,440 WARN L205 SmtUtils]: Spent 586.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:11:12,695 WARN L205 SmtUtils]: Spent 1.32 s on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:11:15,840 WARN L205 SmtUtils]: Spent 1.46 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:11:20,137 WARN L205 SmtUtils]: Spent 3.07 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:11:21,942 WARN L205 SmtUtils]: Spent 848.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:11:24,539 WARN L205 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:11:29,265 WARN L205 SmtUtils]: Spent 1.87 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:11:34,362 WARN L205 SmtUtils]: Spent 3.06 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:11:36,193 WARN L205 SmtUtils]: Spent 672.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:11:42,181 WARN L205 SmtUtils]: Spent 2.56 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:11:48,107 WARN L205 SmtUtils]: Spent 3.38 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:11:50,299 WARN L205 SmtUtils]: Spent 1.10 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:11:56,316 WARN L205 SmtUtils]: Spent 3.17 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:12:02,433 WARN L205 SmtUtils]: Spent 3.19 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:12:03,163 WARN L205 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2021-05-02 13:12:05,399 WARN L205 SmtUtils]: Spent 692.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:12:07,753 WARN L205 SmtUtils]: Spent 790.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:12:10,838 WARN L205 SmtUtils]: Spent 1.39 s on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:12:13,479 WARN L205 SmtUtils]: Spent 1.22 s on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:12:14,411 WARN L205 SmtUtils]: Spent 363.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:12:15,785 WARN L205 SmtUtils]: Spent 543.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:12:17,580 WARN L205 SmtUtils]: Spent 905.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:12:22,647 WARN L205 SmtUtils]: Spent 2.29 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:12:27,326 WARN L205 SmtUtils]: Spent 2.60 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:12:28,446 WARN L205 SmtUtils]: Spent 417.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:12:32,265 WARN L205 SmtUtils]: Spent 1.66 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:12:36,680 WARN L205 SmtUtils]: Spent 1.95 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:12:41,668 WARN L205 SmtUtils]: Spent 3.02 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:12:44,406 WARN L205 SmtUtils]: Spent 1.24 s on a formula simplification that was a NOOP. DAG size: 72 [2021-05-02 13:12:47,910 WARN L205 SmtUtils]: Spent 1.56 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:12:52,608 WARN L205 SmtUtils]: Spent 2.96 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:12:53,245 WARN L205 SmtUtils]: Spent 269.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2021-05-02 13:12:54,919 WARN L205 SmtUtils]: Spent 343.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:12:55,824 WARN L205 SmtUtils]: Spent 367.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:12:57,491 WARN L205 SmtUtils]: Spent 826.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:12:59,166 WARN L205 SmtUtils]: Spent 878.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:13:00,012 WARN L205 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:13:00,948 WARN L205 SmtUtils]: Spent 384.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:13:02,238 WARN L205 SmtUtils]: Spent 741.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:13:05,115 WARN L205 SmtUtils]: Spent 1.58 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:13:09,694 WARN L205 SmtUtils]: Spent 2.50 s on a formula simplification that was a NOOP. DAG size: 75 [2021-05-02 13:13:10,460 WARN L205 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2021-05-02 13:13:11,946 WARN L205 SmtUtils]: Spent 790.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:13:15,730 WARN L205 SmtUtils]: Spent 2.43 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:13:19,128 WARN L205 SmtUtils]: Spent 1.81 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:13:23,205 WARN L205 SmtUtils]: Spent 2.88 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:13:25,815 WARN L205 SmtUtils]: Spent 937.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:13:28,968 WARN L205 SmtUtils]: Spent 1.69 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:13:32,817 WARN L205 SmtUtils]: Spent 2.45 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:13:33,814 WARN L205 SmtUtils]: Spent 431.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2021-05-02 13:13:34,919 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:13:35,958 WARN L205 SmtUtils]: Spent 392.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:13:37,167 WARN L205 SmtUtils]: Spent 543.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:13:37,787 WARN L205 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:13:38,902 WARN L205 SmtUtils]: Spent 477.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:13:41,069 WARN L205 SmtUtils]: Spent 1.03 s on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:13:43,897 WARN L205 SmtUtils]: Spent 1.40 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:13:48,292 WARN L205 SmtUtils]: Spent 2.28 s on a formula simplification that was a NOOP. DAG size: 71 [2021-05-02 13:13:48,919 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2021-05-02 13:13:50,088 WARN L205 SmtUtils]: Spent 546.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:13:51,875 WARN L205 SmtUtils]: Spent 969.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:13:54,983 WARN L205 SmtUtils]: Spent 1.92 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:14:00,613 WARN L205 SmtUtils]: Spent 3.21 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:14:07,890 WARN L205 SmtUtils]: Spent 3.62 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:14:10,091 WARN L205 SmtUtils]: Spent 732.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:14:12,442 WARN L205 SmtUtils]: Spent 1.02 s on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:14:18,620 WARN L205 SmtUtils]: Spent 4.18 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:14:24,410 WARN L205 SmtUtils]: Spent 3.07 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:14:26,714 WARN L205 SmtUtils]: Spent 879.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2021-05-02 13:14:28,482 WARN L205 SmtUtils]: Spent 535.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:14:29,966 WARN L205 SmtUtils]: Spent 770.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:14:31,195 WARN L205 SmtUtils]: Spent 319.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:14:32,310 WARN L205 SmtUtils]: Spent 498.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-02 13:14:34,473 WARN L205 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:14:37,213 WARN L205 SmtUtils]: Spent 1.46 s on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:14:41,898 WARN L205 SmtUtils]: Spent 2.12 s on a formula simplification that was a NOOP. DAG size: 67 [2021-05-02 13:14:42,659 WARN L205 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2021-05-02 13:14:44,182 WARN L205 SmtUtils]: Spent 735.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:14:45,708 WARN L205 SmtUtils]: Spent 748.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:14:48,119 WARN L205 SmtUtils]: Spent 1.26 s on a formula simplification that was a NOOP. DAG size: 66 [2021-05-02 13:14:53,500 WARN L205 SmtUtils]: Spent 2.58 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:15:01,433 WARN L205 SmtUtils]: Spent 2.72 s on a formula simplification that was a NOOP. DAG size: 73 [2021-05-02 13:15:02,646 WARN L205 SmtUtils]: Spent 610.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-05-02 13:15:04,300 WARN L205 SmtUtils]: Spent 754.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-05-02 13:15:08,142 WARN L205 SmtUtils]: Spent 1.76 s on a formula simplification that was a NOOP. DAG size: 70 [2021-05-02 13:15:12,568 WARN L205 SmtUtils]: Spent 2.39 s on a formula simplification that was a NOOP. DAG size: 74 [2021-05-02 13:15:17,866 WARN L205 SmtUtils]: Spent 2.92 s on a formula simplification that was a NOOP. DAG size: 76 [2021-05-02 13:15:21,635 WARN L205 SmtUtils]: Spent 2.16 s on a formula simplification that was a NOOP. DAG size: 69 [2021-05-02 13:15:22,807 WARN L205 SmtUtils]: Spent 405.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:15:23,809 WARN L205 SmtUtils]: Spent 332.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2021-05-02 13:15:25,114 WARN L205 SmtUtils]: Spent 614.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2021-05-02 13:15:27,553 WARN L205 SmtUtils]: Spent 1.24 s on a formula simplification that was a NOOP. DAG size: 63 [2021-05-02 13:15:30,689 WARN L205 SmtUtils]: Spent 1.63 s on a formula simplification that was a NOOP. DAG size: 63