/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-de42.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:56:37,100 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:56:37,101 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:56:37,120 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:56:37,128 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:56:37,129 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:56:37,132 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:56:37,134 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:56:37,136 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:56:37,140 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:56:37,141 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:56:37,142 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:56:37,143 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:56:37,147 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:56:37,147 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:56:37,148 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:56:37,149 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:56:37,154 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:56:37,155 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:56:37,155 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:56:37,157 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 12:56:37,176 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:56:37,176 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:56:37,177 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:56:37,177 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:56:37,177 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:56:37,177 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:56:37,177 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:56:37,177 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:56:37,178 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:56:37,178 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:56:37,178 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:56:37,178 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:56:37,178 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:56:37,178 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:56:37,178 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:56:37,178 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:56:37,179 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:56:37,179 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:56:37,181 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:56:37,181 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:56:37,181 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:56:37,181 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:56:37,181 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:56:37,181 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:56:37,182 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:56:37,182 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:56:37,182 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:56:37,182 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:56:37,182 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:56:37,471 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:56:37,489 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:56:37,491 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:56:37,492 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:56:37,492 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:56:37,493 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/in-de42.c [2021-05-02 12:56:37,534 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/902ea6782/a9c89f39fd3c41a9973790686a849154/FLAGe8e6ba8a1 [2021-05-02 12:56:37,866 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:56:37,867 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/in-de42.c [2021-05-02 12:56:37,871 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/902ea6782/a9c89f39fd3c41a9973790686a849154/FLAGe8e6ba8a1 [2021-05-02 12:56:37,884 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/902ea6782/a9c89f39fd3c41a9973790686a849154 [2021-05-02 12:56:37,886 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:56:37,887 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:56:37,889 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:56:37,890 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:56:37,892 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:56:37,892 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:56:37" (1/1) ... [2021-05-02 12:56:37,893 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1945dacb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:56:37, skipping insertion in model container [2021-05-02 12:56:37,893 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:56:37" (1/1) ... [2021-05-02 12:56:37,900 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:56:37,908 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:56:37,982 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-de42.c[368,381] [2021-05-02 12:56:37,991 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:56:38,011 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:56:38,020 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-de42.c[368,381] [2021-05-02 12:56:38,023 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:56:38,054 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:56:38,054 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:56:38 WrapperNode [2021-05-02 12:56:38,055 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:56:38,055 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:56:38,055 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:56:38,057 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:56:38,063 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:56:38" (1/1) ... [2021-05-02 12:56:38,070 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:56:38" (1/1) ... [2021-05-02 12:56:38,077 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:56:38" (1/1) ... [2021-05-02 12:56:38,077 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:56:38" (1/1) ... [2021-05-02 12:56:38,088 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:56:38" (1/1) ... [2021-05-02 12:56:38,092 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:56:38" (1/1) ... [2021-05-02 12:56:38,096 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:56:38" (1/1) ... [2021-05-02 12:56:38,100 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:56:38,101 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:56:38,101 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:56:38,101 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:56:38,102 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:56:38" (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 12:56:38,163 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:56:38,163 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:56:38,163 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:56:38,164 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:56:38,164 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:56:38,164 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:56:38,164 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:56:38,164 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:56:38,164 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:56:38,165 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 12:56:38,165 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:56:38,165 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:56:38,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:56:38,165 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:56:38,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:56:38,166 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:56:38,166 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:56:38,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:56:38,414 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:56:38,414 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-05-02 12:56:38,415 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:56:38 BoogieIcfgContainer [2021-05-02 12:56:38,415 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:56:38,416 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:56:38,416 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:56:38,418 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:56:38,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:56:37" (1/3) ... [2021-05-02 12:56:38,418 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@347429b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:56:38, skipping insertion in model container [2021-05-02 12:56:38,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:56:38" (2/3) ... [2021-05-02 12:56:38,419 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@347429b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:56:38, skipping insertion in model container [2021-05-02 12:56:38,419 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:56:38" (3/3) ... [2021-05-02 12:56:38,419 INFO L111 eAbstractionObserver]: Analyzing ICFG in-de42.c [2021-05-02 12:56:38,423 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:56:38,425 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:56:38,436 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:56:38,449 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:56:38,450 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:56:38,450 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:56:38,450 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:56:38,450 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:56:38,450 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:56:38,450 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:56:38,450 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:56:38,460 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 16 states have internal predecessors, (25), 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 12:56:38,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:56:38,463 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:38,463 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:38,463 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:38,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:38,467 INFO L82 PathProgramCache]: Analyzing trace with hash 2066875484, now seen corresponding path program 1 times [2021-05-02 12:56:38,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:38,472 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473016721] [2021-05-02 12:56:38,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:38,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:38,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:38,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:38,610 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 12:56:38,611 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:38,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1473016721] [2021-05-02 12:56:38,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1473016721] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:56:38,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:56:38,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:56:38,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452281929] [2021-05-02 12:56:38,615 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:56:38,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:38,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:56:38,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:56:38,626 INFO L87 Difference]: Start difference. First operand has 23 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 16 states have internal predecessors, (25), 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 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 12:56:38,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:38,665 INFO L93 Difference]: Finished difference Result 39 states and 54 transitions. [2021-05-02 12:56:38,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:56:38,667 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 15 [2021-05-02 12:56:38,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:38,671 INFO L225 Difference]: With dead ends: 39 [2021-05-02 12:56:38,671 INFO L226 Difference]: Without dead ends: 16 [2021-05-02 12:56:38,673 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 36.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:56:38,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-02 12:56:38,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-02 12:56:38,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 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 12:56:38,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2021-05-02 12:56:38,695 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 15 [2021-05-02 12:56:38,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:38,695 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2021-05-02 12:56:38,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 12:56:38,696 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2021-05-02 12:56:38,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:56:38,697 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:38,697 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:38,697 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:56:38,697 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:38,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:38,698 INFO L82 PathProgramCache]: Analyzing trace with hash 2063181400, now seen corresponding path program 1 times [2021-05-02 12:56:38,698 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:38,699 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034561903] [2021-05-02 12:56:38,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:38,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:39,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:39,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:39,133 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 12:56:39,134 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:39,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034561903] [2021-05-02 12:56:39,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034561903] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:56:39,134 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:56:39,134 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-02 12:56:39,135 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623665365] [2021-05-02 12:56:39,137 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:56:39,137 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:39,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:56:39,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:56:39,141 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 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 12:56:39,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:39,471 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2021-05-02 12:56:39,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:56:39,472 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 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 15 [2021-05-02 12:56:39,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:39,473 INFO L225 Difference]: With dead ends: 33 [2021-05-02 12:56:39,473 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 12:56:39,474 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 401.3ms TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:56:39,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 12:56:39,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 12:56:39,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.411764705882353) internal successors, (24), 17 states have internal predecessors, (24), 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 12:56:39,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2021-05-02 12:56:39,478 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 15 [2021-05-02 12:56:39,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:39,478 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2021-05-02 12:56:39,479 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 8 states have internal predecessors, (11), 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 12:56:39,479 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2021-05-02 12:56:39,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 12:56:39,479 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:39,479 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:39,479 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:56:39,479 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:39,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:39,480 INFO L82 PathProgramCache]: Analyzing trace with hash 971437455, now seen corresponding path program 1 times [2021-05-02 12:56:39,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:39,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156890111] [2021-05-02 12:56:39,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:39,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:39,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:39,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:39,521 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 12:56:39,521 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:39,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156890111] [2021-05-02 12:56:39,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156890111] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:56:39,521 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:56:39,522 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:56:39,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076260912] [2021-05-02 12:56:39,522 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:56:39,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:39,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:56:39,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:56:39,523 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 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 12:56:39,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:39,586 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2021-05-02 12:56:39,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:56:39,586 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 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 12:56:39,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:39,587 INFO L225 Difference]: With dead ends: 33 [2021-05-02 12:56:39,587 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 12:56:39,587 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:56:39,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 12:56:39,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2021-05-02 12:56:39,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.375) internal successors, (22), 16 states have internal predecessors, (22), 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 12:56:39,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-05-02 12:56:39,592 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 16 [2021-05-02 12:56:39,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:39,592 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-05-02 12:56:39,592 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 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 12:56:39,593 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-05-02 12:56:39,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 12:56:39,593 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:39,593 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:39,593 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 12:56:39,593 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:39,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:39,594 INFO L82 PathProgramCache]: Analyzing trace with hash 1509444864, now seen corresponding path program 1 times [2021-05-02 12:56:39,594 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:39,594 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169738764] [2021-05-02 12:56:39,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:39,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:39,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:39,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:39,646 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 12:56:39,646 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:39,646 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169738764] [2021-05-02 12:56:39,646 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169738764] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:56:39,646 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:56:39,646 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 12:56:39,646 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156461069] [2021-05-02 12:56:39,647 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 12:56:39,647 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:39,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 12:56:39,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:56:39,647 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 5 states, 5 states have (on average 2.4) 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 12:56:39,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:39,731 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2021-05-02 12:56:39,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:56:39,732 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) 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 12:56:39,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:39,732 INFO L225 Difference]: With dead ends: 27 [2021-05-02 12:56:39,732 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:56:39,733 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 61.8ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:56:39,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:56:39,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 12:56:39,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 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 12:56:39,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2021-05-02 12:56:39,739 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 16 [2021-05-02 12:56:39,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:39,739 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2021-05-02 12:56:39,739 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) 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 12:56:39,739 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2021-05-02 12:56:39,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 12:56:39,739 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:39,740 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:39,740 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 12:56:39,740 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:39,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:39,740 INFO L82 PathProgramCache]: Analyzing trace with hash 570818913, now seen corresponding path program 1 times [2021-05-02 12:56:39,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:39,741 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442675542] [2021-05-02 12:56:39,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:39,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:39,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:39,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:39,861 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 12:56:39,861 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:39,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442675542] [2021-05-02 12:56:39,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442675542] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:39,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401659359] [2021-05-02 12:56:39,862 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 12:56:39,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:39,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:56:39,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:39,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:39,987 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 12:56:39,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401659359] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:39,988 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:39,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:56:39,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756883901] [2021-05-02 12:56:39,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:56:39,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:39,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:56:39,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:56:39,989 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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 12:56:40,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:40,114 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2021-05-02 12:56:40,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:56:40,115 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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 16 [2021-05-02 12:56:40,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:40,116 INFO L225 Difference]: With dead ends: 32 [2021-05-02 12:56:40,116 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 12:56:40,116 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 108.9ms TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:56:40,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 12:56:40,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2021-05-02 12:56:40,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 18 states have internal predecessors, (24), 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 12:56:40,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-05-02 12:56:40,120 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 16 [2021-05-02 12:56:40,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:40,120 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-05-02 12:56:40,120 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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 12:56:40,121 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-05-02 12:56:40,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:56:40,121 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:40,121 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:40,336 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:40,336 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:40,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:40,337 INFO L82 PathProgramCache]: Analyzing trace with hash 1552222072, now seen corresponding path program 2 times [2021-05-02 12:56:40,337 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:40,337 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886971327] [2021-05-02 12:56:40,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:40,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:40,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:40,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:40,423 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 12:56:40,423 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:40,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886971327] [2021-05-02 12:56:40,423 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886971327] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:40,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [169239102] [2021-05-02 12:56:40,423 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 12:56:40,469 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:56:40,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:40,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 12:56:40,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:40,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:40,527 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 12:56:40,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [169239102] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:40,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:40,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:56:40,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441162065] [2021-05-02 12:56:40,528 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:56:40,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:40,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:56:40,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:56:40,528 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 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 12:56:40,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:40,680 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2021-05-02 12:56:40,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:56:40,680 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 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 12:56:40,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:40,681 INFO L225 Difference]: With dead ends: 39 [2021-05-02 12:56:40,681 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 12:56:40,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 139.1ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:56:40,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 12:56:40,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2021-05-02 12:56:40,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 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 12:56:40,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2021-05-02 12:56:40,684 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 17 [2021-05-02 12:56:40,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:40,684 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2021-05-02 12:56:40,685 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 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 12:56:40,685 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2021-05-02 12:56:40,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 12:56:40,685 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:40,685 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:40,895 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:40,896 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:40,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:40,896 INFO L82 PathProgramCache]: Analyzing trace with hash 1344200880, now seen corresponding path program 1 times [2021-05-02 12:56:40,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:40,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451148148] [2021-05-02 12:56:40,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:40,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:40,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:40,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:40,984 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 12:56:40,985 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:40,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451148148] [2021-05-02 12:56:40,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451148148] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:40,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104998217] [2021-05-02 12:56:40,985 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 12:56:41,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:41,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 12:56:41,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:41,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:41,064 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 12:56:41,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104998217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:41,064 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:41,064 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 5 [2021-05-02 12:56:41,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635466023] [2021-05-02 12:56:41,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 12:56:41,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:41,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 12:56:41,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:56:41,066 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 12:56:41,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:41,144 INFO L93 Difference]: Finished difference Result 44 states and 58 transitions. [2021-05-02 12:56:41,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:56:41,144 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 12:56:41,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:41,145 INFO L225 Difference]: With dead ends: 44 [2021-05-02 12:56:41,145 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 12:56:41,145 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 63.7ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:56:41,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 12:56:41,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2021-05-02 12:56:41,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.40625) internal successors, (45), 32 states have internal predecessors, (45), 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 12:56:41,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 49 transitions. [2021-05-02 12:56:41,150 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 49 transitions. Word has length 18 [2021-05-02 12:56:41,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:41,150 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 49 transitions. [2021-05-02 12:56:41,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 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 12:56:41,150 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 49 transitions. [2021-05-02 12:56:41,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 12:56:41,151 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:41,151 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:41,365 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:41,365 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:41,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:41,366 INFO L82 PathProgramCache]: Analyzing trace with hash 1910948929, now seen corresponding path program 3 times [2021-05-02 12:56:41,366 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:41,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415193276] [2021-05-02 12:56:41,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:41,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:41,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:41,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:41,445 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 12:56:41,446 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:41,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415193276] [2021-05-02 12:56:41,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415193276] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:41,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1562269421] [2021-05-02 12:56:41,446 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 12:56:41,493 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 12:56:41,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:41,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 12:56:41,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:41,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:41,560 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 12:56:41,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1562269421] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:41,560 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:41,560 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:56:41,560 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685238744] [2021-05-02 12:56:41,561 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:56:41,561 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:41,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:56:41,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:56:41,561 INFO L87 Difference]: Start difference. First operand 37 states and 49 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 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 12:56:41,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:41,771 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2021-05-02 12:56:41,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:56:41,772 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 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 12:56:41,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:41,772 INFO L225 Difference]: With dead ends: 62 [2021-05-02 12:56:41,772 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 12:56:41,773 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 160.9ms TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:56:41,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 12:56:41,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2021-05-02 12:56:41,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.4102564102564104) internal successors, (55), 39 states have internal predecessors, (55), 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 12:56:41,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 59 transitions. [2021-05-02 12:56:41,777 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 59 transitions. Word has length 18 [2021-05-02 12:56:41,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:41,777 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 59 transitions. [2021-05-02 12:56:41,778 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 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 12:56:41,778 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 59 transitions. [2021-05-02 12:56:41,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 12:56:41,778 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:41,778 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 12:56:41,995 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:41,995 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:41,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:41,995 INFO L82 PathProgramCache]: Analyzing trace with hash -1244950584, now seen corresponding path program 1 times [2021-05-02 12:56:41,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:41,996 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655560966] [2021-05-02 12:56:41,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:42,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:42,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:42,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:42,236 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:56:42,236 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:42,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655560966] [2021-05-02 12:56:42,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655560966] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:42,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385936950] [2021-05-02 12:56:42,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 12:56:42,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:42,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 12:56:42,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:42,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:42,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:42,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:42,541 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:56:42,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1385936950] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:42,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:42,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 20 [2021-05-02 12:56:42,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152188091] [2021-05-02 12:56:42,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:56:42,542 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:42,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:56:42,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=338, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:56:42,543 INFO L87 Difference]: Start difference. First operand 44 states and 59 transitions. Second operand has 20 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 17 states have internal predecessors, (27), 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 12:56:43,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:43,159 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2021-05-02 12:56:43,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:56:43,160 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 17 states have internal predecessors, (27), 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 19 [2021-05-02 12:56:43,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:43,160 INFO L225 Difference]: With dead ends: 59 [2021-05-02 12:56:43,160 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 12:56:43,161 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 764.1ms TimeCoverageRelationStatistics Valid=102, Invalid=710, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:56:43,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 12:56:43,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-02 12:56:43,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.3714285714285714) internal successors, (48), 35 states have internal predecessors, (48), 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 12:56:43,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 52 transitions. [2021-05-02 12:56:43,165 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 52 transitions. Word has length 19 [2021-05-02 12:56:43,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:43,165 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 52 transitions. [2021-05-02 12:56:43,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 17 states have internal predecessors, (27), 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 12:56:43,165 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 52 transitions. [2021-05-02 12:56:43,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 12:56:43,165 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:43,165 INFO L523 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:43,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:43,368 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:43,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:43,369 INFO L82 PathProgramCache]: Analyzing trace with hash 146579608, now seen corresponding path program 4 times [2021-05-02 12:56:43,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:43,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158649985] [2021-05-02 12:56:43,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:43,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:43,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:43,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:43,460 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 12:56:43,460 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:43,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158649985] [2021-05-02 12:56:43,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158649985] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:43,461 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1234660209] [2021-05-02 12:56:43,461 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 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 12:56:43,493 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:56:43,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:43,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:56:43,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:43,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:43,535 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 12:56:43,535 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1234660209] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:43,535 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:43,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 12:56:43,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020544775] [2021-05-02 12:56:43,536 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:56:43,536 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:43,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:56:43,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:56:43,536 INFO L87 Difference]: Start difference. First operand 40 states and 52 transitions. Second operand has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 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 12:56:43,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:43,796 INFO L93 Difference]: Finished difference Result 67 states and 96 transitions. [2021-05-02 12:56:43,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:56:43,797 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 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 12:56:43,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:43,797 INFO L225 Difference]: With dead ends: 67 [2021-05-02 12:56:43,797 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 12:56:43,798 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 192.8ms TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:56:43,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 12:56:43,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 47. [2021-05-02 12:56:43,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.380952380952381) internal successors, (58), 42 states have internal predecessors, (58), 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 12:56:43,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 62 transitions. [2021-05-02 12:56:43,802 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 62 transitions. Word has length 19 [2021-05-02 12:56:43,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:43,803 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 62 transitions. [2021-05-02 12:56:43,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 1.8) internal successors, (18), 9 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 12:56:43,803 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 62 transitions. [2021-05-02 12:56:43,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 12:56:43,803 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:43,803 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:44,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:44,020 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:44,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:44,020 INFO L82 PathProgramCache]: Analyzing trace with hash 1285705505, now seen corresponding path program 5 times [2021-05-02 12:56:44,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:44,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793251647] [2021-05-02 12:56:44,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:44,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:44,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:44,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:44,116 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 12:56:44,116 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:44,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793251647] [2021-05-02 12:56:44,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1793251647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:44,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1375231654] [2021-05-02 12:56:44,117 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 12:56:44,154 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 12:56:44,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:44,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 12:56:44,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:44,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:44,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:44,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:44,205 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 12:56:44,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1375231654] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:44,205 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:44,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:56:44,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646043620] [2021-05-02 12:56:44,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:56:44,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:44,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:56:44,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:56:44,206 INFO L87 Difference]: Start difference. First operand 47 states and 62 transitions. Second operand has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 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 12:56:44,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:44,509 INFO L93 Difference]: Finished difference Result 76 states and 110 transitions. [2021-05-02 12:56:44,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:56:44,510 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 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 12:56:44,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:44,511 INFO L225 Difference]: With dead ends: 76 [2021-05-02 12:56:44,511 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 12:56:44,511 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 215.9ms TimeCoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:56:44,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 12:56:44,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 54. [2021-05-02 12:56:44,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.3877551020408163) internal successors, (68), 49 states have internal predecessors, (68), 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 12:56:44,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 72 transitions. [2021-05-02 12:56:44,516 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 72 transitions. Word has length 20 [2021-05-02 12:56:44,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:44,516 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 72 transitions. [2021-05-02 12:56:44,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 10 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 12:56:44,516 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 72 transitions. [2021-05-02 12:56:44,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 12:56:44,517 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:44,517 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:44,732 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:44,732 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:44,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:44,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1586904504, now seen corresponding path program 2 times [2021-05-02 12:56:44,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:44,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71103745] [2021-05-02 12:56:44,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:44,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:44,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:44,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:44,824 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 12:56:44,824 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:44,824 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71103745] [2021-05-02 12:56:44,824 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71103745] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:44,824 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [928884401] [2021-05-02 12:56:44,824 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 12:56:44,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:56:44,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:44,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 12:56:44,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:44,906 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 12:56:44,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [928884401] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:44,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:44,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2021-05-02 12:56:44,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623672152] [2021-05-02 12:56:44,907 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:56:44,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:44,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:56:44,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:56:44,908 INFO L87 Difference]: Start difference. First operand 54 states and 72 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 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 12:56:45,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:45,092 INFO L93 Difference]: Finished difference Result 69 states and 88 transitions. [2021-05-02 12:56:45,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:56:45,093 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 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 12:56:45,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:45,093 INFO L225 Difference]: With dead ends: 69 [2021-05-02 12:56:45,093 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 12:56:45,094 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 165.9ms TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:56:45,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 12:56:45,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2021-05-02 12:56:45,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 49 states have (on average 1.3673469387755102) internal successors, (67), 49 states have internal predecessors, (67), 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 12:56:45,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 71 transitions. [2021-05-02 12:56:45,098 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 71 transitions. Word has length 21 [2021-05-02 12:56:45,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:45,098 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 71 transitions. [2021-05-02 12:56:45,098 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 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 12:56:45,098 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 71 transitions. [2021-05-02 12:56:45,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 12:56:45,099 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:45,099 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:45,300 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 12:56:45,301 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:45,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:45,301 INFO L82 PathProgramCache]: Analyzing trace with hash 323810136, now seen corresponding path program 2 times [2021-05-02 12:56:45,301 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:45,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320337074] [2021-05-02 12:56:45,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:45,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:45,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:45,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:45,365 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:56:45,365 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:45,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320337074] [2021-05-02 12:56:45,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320337074] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:45,366 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126781636] [2021-05-02 12:56:45,366 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 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 12:56:45,400 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:56:45,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:45,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 12:56:45,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:45,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:45,450 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 12:56:45,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126781636] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:45,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:45,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 9 [2021-05-02 12:56:45,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184870242] [2021-05-02 12:56:45,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:56:45,451 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:45,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:56:45,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:56:45,451 INFO L87 Difference]: Start difference. First operand 54 states and 71 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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 12:56:45,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:45,641 INFO L93 Difference]: Finished difference Result 76 states and 103 transitions. [2021-05-02 12:56:45,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:56:45,641 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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 21 [2021-05-02 12:56:45,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:45,642 INFO L225 Difference]: With dead ends: 76 [2021-05-02 12:56:45,642 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 12:56:45,642 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 126.9ms TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:56:45,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 12:56:45,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 67. [2021-05-02 12:56:45,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.3870967741935485) internal successors, (86), 62 states have internal predecessors, (86), 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 12:56:45,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 90 transitions. [2021-05-02 12:56:45,648 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 90 transitions. Word has length 21 [2021-05-02 12:56:45,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:45,648 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 90 transitions. [2021-05-02 12:56:45,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 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 12:56:45,648 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 90 transitions. [2021-05-02 12:56:45,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 12:56:45,648 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:45,648 INFO L523 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:45,849 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:56:45,849 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:45,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:45,850 INFO L82 PathProgramCache]: Analyzing trace with hash -2056097352, now seen corresponding path program 6 times [2021-05-02 12:56:45,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:45,850 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358886378] [2021-05-02 12:56:45,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:45,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:45,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:45,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:45,963 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 12:56:45,963 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:45,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358886378] [2021-05-02 12:56:45,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358886378] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:45,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456499289] [2021-05-02 12:56:45,963 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 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 12:56:46,029 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 12:56:46,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:46,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:56:46,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:46,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:46,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:46,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:46,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:46,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:46,082 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 12:56:46,082 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456499289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:46,082 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:46,082 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:56:46,082 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497032706] [2021-05-02 12:56:46,083 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:56:46,083 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:46,083 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:56:46,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:56:46,083 INFO L87 Difference]: Start difference. First operand 67 states and 90 transitions. Second operand has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 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 12:56:46,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:46,419 INFO L93 Difference]: Finished difference Result 109 states and 162 transitions. [2021-05-02 12:56:46,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:56:46,420 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 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 12:56:46,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:46,420 INFO L225 Difference]: With dead ends: 109 [2021-05-02 12:56:46,420 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 12:56:46,421 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 251.6ms TimeCoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:56:46,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 12:56:46,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 76. [2021-05-02 12:56:46,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.3943661971830985) internal successors, (99), 71 states have internal predecessors, (99), 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 12:56:46,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 103 transitions. [2021-05-02 12:56:46,426 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 103 transitions. Word has length 21 [2021-05-02 12:56:46,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:46,427 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 103 transitions. [2021-05-02 12:56:46,427 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 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 12:56:46,427 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 103 transitions. [2021-05-02 12:56:46,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 12:56:46,427 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:46,427 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:46,645 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:56:46,645 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:46,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:46,645 INFO L82 PathProgramCache]: Analyzing trace with hash 219580352, now seen corresponding path program 3 times [2021-05-02 12:56:46,646 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:46,646 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53807353] [2021-05-02 12:56:46,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:46,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:46,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:46,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:46,731 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:56:46,731 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:46,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53807353] [2021-05-02 12:56:46,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [53807353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:46,731 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634970449] [2021-05-02 12:56:46,731 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 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 12:56:46,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 12:56:46,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:46,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 12:56:46,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:46,847 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 12:56:46,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634970449] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:46,847 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:46,847 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2021-05-02 12:56:46,847 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338961091] [2021-05-02 12:56:46,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:56:46,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:46,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:56:46,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:56:46,848 INFO L87 Difference]: Start difference. First operand 76 states and 103 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 11 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 12:56:47,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:47,101 INFO L93 Difference]: Finished difference Result 92 states and 120 transitions. [2021-05-02 12:56:47,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:56:47,101 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 11 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 22 [2021-05-02 12:56:47,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:47,102 INFO L225 Difference]: With dead ends: 92 [2021-05-02 12:56:47,102 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 12:56:47,102 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 240.3ms TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:56:47,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 12:56:47,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 75. [2021-05-02 12:56:47,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.3714285714285714) internal successors, (96), 70 states have internal predecessors, (96), 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 12:56:47,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 100 transitions. [2021-05-02 12:56:47,108 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 100 transitions. Word has length 22 [2021-05-02 12:56:47,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:47,108 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 100 transitions. [2021-05-02 12:56:47,108 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 11 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 12:56:47,108 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 100 transitions. [2021-05-02 12:56:47,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 12:56:47,109 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:47,109 INFO L523 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:47,325 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 12:56:47,326 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:47,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:47,326 INFO L82 PathProgramCache]: Analyzing trace with hash 1722196481, now seen corresponding path program 7 times [2021-05-02 12:56:47,326 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:47,326 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770438342] [2021-05-02 12:56:47,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:47,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:47,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:47,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:47,436 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 12:56:47,436 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:47,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770438342] [2021-05-02 12:56:47,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770438342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:47,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423473719] [2021-05-02 12:56:47,436 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 12:56:47,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:47,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:56:47,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:47,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:47,517 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 12:56:47,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423473719] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:47,517 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:56:47,517 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:56:47,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455518514] [2021-05-02 12:56:47,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:56:47,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:56:47,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:56:47,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:56:47,518 INFO L87 Difference]: Start difference. First operand 75 states and 100 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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 12:56:47,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:56:47,927 INFO L93 Difference]: Finished difference Result 120 states and 178 transitions. [2021-05-02 12:56:47,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:56:47,927 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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 12:56:47,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:56:47,928 INFO L225 Difference]: With dead ends: 120 [2021-05-02 12:56:47,928 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 12:56:47,929 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 285.1ms TimeCoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:56:47,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 12:56:47,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 84. [2021-05-02 12:56:47,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.379746835443038) internal successors, (109), 79 states have internal predecessors, (109), 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 12:56:47,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 113 transitions. [2021-05-02 12:56:47,949 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 113 transitions. Word has length 22 [2021-05-02 12:56:47,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:56:47,949 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 113 transitions. [2021-05-02 12:56:47,949 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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 12:56:47,949 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 113 transitions. [2021-05-02 12:56:47,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:56:47,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:56:47,951 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:56:48,164 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:56:48,165 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:56:48,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:56:48,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1247228840, now seen corresponding path program 3 times [2021-05-02 12:56:48,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:56:48,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080143667] [2021-05-02 12:56:48,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:56:48,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:48,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:56:48,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:56:48,519 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:56:48,519 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:56:48,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080143667] [2021-05-02 12:56:48,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080143667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:56:48,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465291789] [2021-05-02 12:56:48,519 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 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 12:56:48,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 12:56:48,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:56:48,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 12:56:48,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:56:48,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:48,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:49,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:49,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:49,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:49,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:49,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:49,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:49,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:49,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:49,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:50,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:50,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:50,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:50,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:50,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:50,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:56:50,131 WARN L159 QuantifierPusher]: Ignoring assumption.